{"id":4551,"date":"2026-03-13T00:27:22","date_gmt":"2026-03-13T00:27:22","guid":{"rendered":"https:\/\/aceworldpgs.com\/?page_id=4551"},"modified":"2026-05-12T02:57:40","modified_gmt":"2026-05-12T02:57:40","slug":"isbn-validator","status":"publish","type":"post","link":"https:\/\/aceworldpgs.com\/tools\/isbn-validator\/","title":{"rendered":"ISBN Validator"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"WebApplication\",\n  \"name\": \"ACEworld Professional ISBN Validator\",\n  \"url\": \"https:\/\/aceworldpgs.com\/tools\/isbn-validator\/\",\n  \"description\": \"A free online tool to validate ISBN-10 and ISBN-13 numbers, verify checksum accuracy, convert ISBN-10 to ISBN-13, and assist authors and publishers with professional book identification.\",\n  \"applicationCategory\": \"UtilitiesApplication\",\n  \"operatingSystem\": \"All\",\n  \"browserRequirements\": \"Requires JavaScript\",\n  \"creator\": {\n    \"@type\": \"Organization\",\n    \"name\": \"ACEworld Publishing Services\",\n    \"url\": \"https:\/\/aceworldpgs.com\"\n  },\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"price\": \"0\",\n    \"priceCurrency\": \"USD\"\n  },\n  \"featureList\": [\n    \"Validate ISBN-10 numbers\",\n    \"Validate ISBN-13 numbers\",\n    \"Verify ISBN checksum accuracy\",\n    \"Convert ISBN-10 to ISBN-13\",\n    \"Support authors and publishers with book identification\"\n  ],\n  \"aggregateRating\": {\n    \"@type\": \"AggregateRating\",\n    \"ratingValue\": \"4.9\",\n    \"reviewCount\": \"124\"\n  }\n}\n<\/script>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><style>\n\/* \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n   ISBN VALIDATOR \u2014 Design tokens inherit from ACEworld toolkit.\n   Local tokens defined here for self-containment.\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 *\/\n:root {\n  --isbn-navy:      #0f1c3f;\n  --isbn-blue:      #1d4ed8;\n  --isbn-blue-lt:   #3b82f6;\n  --isbn-blue-pale: #eff6ff;\n  --isbn-green:     #166534;\n  --isbn-green-lt:  #dcfce7;\n  --isbn-green-bd:  #86efac;\n  --isbn-red:       #dc2626;\n  --isbn-red-lt:    #fef2f2;\n  --isbn-red-bd:    #fca5a5;\n  --isbn-amber:     #f59e0b;\n  --isbn-amber-lt:  #fffbeb;\n  --isbn-white:     #ffffff;\n  --isbn-gray-50:   #f8fafc;\n  --isbn-gray-100:  #f1f5f9;\n  --isbn-gray-200:  #e2e8f0;\n  --isbn-gray-300:  #cbd5e1;\n  --isbn-gray-400:  #94a3b8;\n  --isbn-gray-600:  #475569;\n  --isbn-gray-800:  #1e293b;\n  --isbn-radius:    12px;\n  --isbn-radius-sm: 8px;\n  --isbn-shadow:    0 4px 24px rgba(15,28,63,0.08);\n  --isbn-shadow-lg: 0 12px 48px rgba(15,28,63,0.12);\n  --isbn-trans:     all 0.2s cubic-bezier(0.4,0,0.2,1);\n  --isbn-font:      'DM Sans', 'Segoe UI', system-ui, sans-serif;\n  --isbn-mono:      'DM Mono', 'Fira Code', ui-monospace, monospace;\n}\n\n\/* \u2500\u2500 ACE HEADER local copy (self-contained) \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.ace-tool { max-width: 900px; margin: 0 auto; font-family: var(--isbn-font); }\n.ace-header {\n  background: linear-gradient(135deg, var(--isbn-navy) 0%, #1e3a7a 100%);\n  padding: 28px 32px 24px;\n  border-radius: 20px 20px 0 0;\n  position: relative;\n  overflow: hidden;\n}\n.ace-header::after {\n  content: '';\n  position: absolute;\n  right: -60px; top: -60px;\n  width: 240px; height: 240px;\n  border-radius: 50%;\n  background: rgba(59,130,246,0.12);\n  pointer-events: none;\n}\n.ace-header::before {\n  content: '';\n  position: absolute;\n  left: -40px; bottom: -50px;\n  width: 160px; height: 160px;\n  border-radius: 50%;\n  background: rgba(245,158,11,0.06);\n  pointer-events: none;\n}\n.ace-header-inner {\n  display: flex;\n  align-items: flex-start;\n  justify-content: space-between;\n  gap: 16px;\n  flex-wrap: wrap;\n  position: relative;\n  z-index: 1;\n}\n.ace-header-identity { display: flex; flex-direction: column; gap: 6px; }\n.ace-header-badge {\n  display: inline-flex;\n  align-items: center;\n  gap: 5px;\n  padding: 3px 10px;\n  border-radius: 20px;\n  font-size: 10px;\n  font-weight: 800;\n  text-transform: uppercase;\n  letter-spacing: 0.08em;\n  border: 1px solid rgba(255,255,255,0.25);\n  width: fit-content;\n  color: #fff;\n  background: rgba(255,255,255,0.15);\n}\n.ace-header-badge.badge-isbn {\n  background: rgba(245,158,11,0.35);\n  border-color: rgba(245,158,11,0.6);\n}\n.ace-header-title {\n  color: #fff;\n  font-size: clamp(18px,3vw,24px);\n  font-weight: 700;\n  letter-spacing: -0.02em;\n  line-height: 1.2;\n  margin: 0;\n}\n.ace-header-subtitle {\n  color: rgba(255,255,255,0.68);\n  font-size: 13px;\n  font-weight: 400;\n  line-height: 1.5;\n  margin: 0;\n  max-width: 480px;\n}\n.ace-header-cta {\n  display: inline-flex;\n  align-items: center;\n  gap: 7px;\n  background: rgba(255,255,255,0.10);\n  color: #fff;\n  font-family: var(--isbn-font);\n  font-size: 11px;\n  font-weight: 600;\n  padding: 8px 14px;\n  border-radius: 20px;\n  text-decoration: none;\n  border: 1px solid rgba(255,255,255,0.22);\n  white-space: nowrap;\n  transition: var(--isbn-trans);\n  flex-shrink: 0;\n  position: relative;\n  z-index: 1;\n}\n.ace-header-cta:hover { background: rgba(255,255,255,0.20); color: #fff; text-decoration: none; }\n.ace-cta-badge {\n  background: var(--isbn-amber);\n  color: #000;\n  font-size: 9px;\n  font-weight: 800;\n  padding: 2px 6px;\n  border-radius: 4px;\n}\n@media (max-width: 560px) {\n  .ace-header { padding: 20px 20px 18px; border-radius: 16px 16px 0 0; }\n  .ace-header-inner { flex-direction: column; gap: 14px; }\n  .ace-header-cta { align-self: flex-start; }\n}\n\n\/* \u2500\u2500 TOOL SHELL \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-shell {\n  background: var(--isbn-white);\n  border-radius: 0 0 20px 20px;\n  box-shadow: var(--isbn-shadow-lg);\n  overflow: hidden;\n}\n\n\/* \u2500\u2500 BULK MODE BANNER \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-bulk-banner {\n  background: var(--isbn-blue-pale);\n  border-bottom: 1px solid var(--isbn-gray-200);\n  padding: 10px 28px;\n  display: flex;\n  align-items: center;\n  justify-content: flex-end;\n  gap: 8px;\n}\n.isbn-bulk-link {\n  display: inline-flex;\n  align-items: center;\n  gap: 6px;\n  font-size: 12px;\n  font-weight: 600;\n  color: var(--isbn-blue);\n  text-decoration: none;\n  transition: var(--isbn-trans);\n}\n.isbn-bulk-link:hover { color: var(--isbn-navy); text-decoration: none; }\n.isbn-pro-tag {\n  background: var(--isbn-amber);\n  color: #000;\n  font-size: 9px;\n  font-weight: 800;\n  padding: 2px 6px;\n  border-radius: 4px;\n  text-transform: uppercase;\n  letter-spacing: 0.06em;\n}\n\n\/* \u2500\u2500 MAIN INPUT AREA \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-input-area {\n  padding: 28px 28px 0;\n}\n.isbn-input-label {\n  display: block;\n  font-size: 11px;\n  font-weight: 700;\n  text-transform: uppercase;\n  letter-spacing: 0.08em;\n  color: var(--isbn-gray-600);\n  margin-bottom: 10px;\n}\n.isbn-input-row {\n  display: flex;\n  gap: 10px;\n  align-items: stretch;\n}\n.isbn-input-wrap {\n  flex: 1;\n  position: relative;\n}\n.isbn-input-wrap .isbn-prefix {\n  position: absolute;\n  left: 14px;\n  top: 50%;\n  transform: translateY(-50%);\n  font-size: 12px;\n  font-weight: 700;\n  color: var(--isbn-gray-400);\n  pointer-events: none;\n  font-family: var(--isbn-mono);\n  letter-spacing: 0.05em;\n}\n#isbnInput {\n  width: 100%;\n  padding: 14px 14px 14px 58px;\n  border: 2px solid var(--isbn-gray-200);\n  border-radius: var(--isbn-radius-sm);\n  font-size: 18px;\n  font-family: var(--isbn-mono);\n  font-weight: 500;\n  color: var(--isbn-gray-800);\n  background: var(--isbn-white);\n  outline: none;\n  transition: var(--isbn-trans);\n  letter-spacing: 0.06em;\n  -webkit-appearance: none;\n}\n#isbnInput::placeholder { color: var(--isbn-gray-300); font-size: 15px; letter-spacing: 0; font-family: var(--isbn-font); }\n#isbnInput:focus { border-color: var(--isbn-blue-lt); box-shadow: 0 0 0 4px rgba(59,130,246,0.1); }\n#isbnInput.valid-state   { border-color: #16a34a; background: #f0fdf4; }\n#isbnInput.invalid-state { border-color: var(--isbn-red); background: var(--isbn-red-lt); }\n\n.isbn-validate-btn {\n  padding: 14px 24px;\n  background: var(--isbn-blue);\n  color: #fff;\n  border: none;\n  border-radius: var(--isbn-radius-sm);\n  font-size: 14px;\n  font-weight: 700;\n  font-family: var(--isbn-font);\n  cursor: pointer;\n  transition: var(--isbn-trans);\n  white-space: nowrap;\n  display: flex;\n  align-items: center;\n  gap: 8px;\n  flex-shrink: 0;\n}\n.isbn-validate-btn:hover  { background: #1a45c0; box-shadow: 0 4px 16px rgba(29,78,216,0.3); }\n.isbn-validate-btn:active { transform: scale(0.98); }\n.isbn-validate-btn .btn-icon { font-size: 16px; }\n\n@media (max-width: 480px) {\n  .isbn-input-area { padding: 20px 18px 0; }\n  .isbn-input-row { flex-direction: column; }\n  .isbn-validate-btn { width: 100%; justify-content: center; padding: 14px; }\n}\n\n\/* \u2500\u2500 RESULT TOAST \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-result-area { padding: 16px 28px 0; }\n@media (max-width: 480px) { .isbn-result-area { padding: 14px 18px 0; } }\n\n.isbn-result-toast {\n  border-radius: var(--isbn-radius-sm);\n  padding: 14px 16px;\n  display: flex;\n  align-items: flex-start;\n  gap: 12px;\n  animation: isbnSlideIn 0.3s cubic-bezier(0.4,0,0.2,1);\n}\n@keyframes isbnSlideIn { from { opacity:0; transform:translateY(-8px); } to { opacity:1; transform:translateY(0); } }\n.isbn-result-toast.success {\n  background: var(--isbn-green-lt);\n  border: 1.5px solid var(--isbn-green-bd);\n}\n.isbn-result-toast.error {\n  background: var(--isbn-red-lt);\n  border: 1.5px solid var(--isbn-red-bd);\n}\n.isbn-result-toast.info {\n  background: var(--isbn-blue-pale);\n  border: 1.5px solid #bfdbfe;\n}\n.isbn-toast-icon { font-size: 20px; flex-shrink: 0; line-height: 1.4; }\n.isbn-toast-content { flex: 1; }\n.isbn-toast-title { font-size: 14px; font-weight: 700; margin-bottom: 2px; }\n.isbn-toast-title.success { color: var(--isbn-green); }\n.isbn-toast-title.error   { color: var(--isbn-red); }\n.isbn-toast-title.info    { color: var(--isbn-blue); }\n.isbn-toast-body { font-size: 12px; color: var(--isbn-gray-600); line-height: 1.5; }\n.isbn-number-display {\n  font-family: var(--isbn-mono);\n  font-size: 16px;\n  font-weight: 700;\n  color: var(--isbn-gray-800);\n  letter-spacing: 0.08em;\n  margin-top: 6px;\n  display: flex;\n  align-items: center;\n  gap: 8px;\n  flex-wrap: wrap;\n}\n.isbn-copy-pill {\n  display: inline-flex;\n  align-items: center;\n  gap: 4px;\n  background: var(--isbn-white);\n  border: 1px solid var(--isbn-gray-300);\n  color: var(--isbn-gray-600);\n  font-size: 10px;\n  font-weight: 600;\n  font-family: var(--isbn-font);\n  padding: 3px 8px;\n  border-radius: 10px;\n  cursor: pointer;\n  transition: var(--isbn-trans);\n  text-transform: uppercase;\n  letter-spacing: 0.05em;\n}\n.isbn-copy-pill:hover { background: var(--isbn-gray-100); border-color: var(--isbn-gray-400); }\n\n\/* \u2500\u2500 BOOK PREVIEW CARD \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-book-card {\n  margin: 14px 28px 0;\n  background: var(--isbn-amber-lt);\n  border: 1.5px solid #fde68a;\n  border-radius: var(--isbn-radius);\n  padding: 16px;\n  display: flex;\n  gap: 16px;\n  align-items: flex-start;\n  animation: isbnSlideIn 0.35s cubic-bezier(0.4,0,0.2,1);\n}\n.isbn-book-cover {\n  width: 70px;\n  flex-shrink: 0;\n  border-radius: 4px;\n  box-shadow: 0 4px 12px rgba(0,0,0,0.15);\n  object-fit: cover;\n}\n.isbn-book-meta { flex: 1; min-width: 0; }\n.isbn-book-title { font-size: 14px; font-weight: 700; color: var(--isbn-gray-800); margin-bottom: 3px; line-height: 1.3; }\n.isbn-book-author { font-size: 12px; color: var(--isbn-gray-600); margin-bottom: 6px; }\n.isbn-book-source { font-size: 10px; color: var(--isbn-gray-400); font-style: italic; }\n@media (max-width: 480px) { .isbn-book-card { margin: 12px 18px 0; } }\n\n\/* \u2500\u2500 SECTION DIVIDER \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-section {\n  padding: 20px 28px 0;\n}\n@media (max-width: 480px) { .isbn-section { padding: 18px 18px 0; } }\n\n.isbn-section-header {\n  display: flex;\n  align-items: center;\n  gap: 8px;\n  margin-bottom: 12px;\n}\n.isbn-section-title {\n  font-size: 10px;\n  font-weight: 800;\n  text-transform: uppercase;\n  letter-spacing: 0.1em;\n  color: var(--isbn-blue);\n  white-space: nowrap;\n}\n.isbn-section-line {\n  flex: 1;\n  height: 1px;\n  background: var(--isbn-gray-200);\n}\n\n\/* \u2500\u2500 DATABASE PILLS \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-db-grid {\n  display: flex;\n  flex-wrap: wrap;\n  gap: 7px;\n}\n.isbn-db-pill {\n  display: inline-flex;\n  align-items: center;\n  gap: 5px;\n  padding: 6px 12px;\n  background: var(--isbn-white);\n  border: 1.5px solid var(--isbn-gray-200);\n  border-radius: 20px;\n  font-size: 12px;\n  font-weight: 600;\n  color: var(--isbn-gray-700, #374151);\n  cursor: pointer;\n  transition: var(--isbn-trans);\n  font-family: var(--isbn-font);\n}\n.isbn-db-pill:hover {\n  border-color: var(--isbn-blue-lt);\n  background: var(--isbn-blue-pale);\n  color: var(--isbn-blue);\n  transform: translateY(-1px);\n  box-shadow: 0 3px 10px rgba(29,78,216,0.12);\n}\n.isbn-db-pill.checked {\n  background: var(--isbn-green-lt);\n  border-color: var(--isbn-green-bd);\n  color: var(--isbn-green);\n}\n.isbn-db-pill.checked::after { content: ' \u2713'; font-weight: 800; }\n\n\/* \u2500\u2500 SHOW MORE TOGGLE \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-show-more-btn {\n  display: inline-flex;\n  align-items: center;\n  gap: 7px;\n  margin-top: 12px;\n  padding: 7px 16px;\n  background: var(--isbn-gray-100);\n  border: 1px solid var(--isbn-gray-200);\n  border-radius: 20px;\n  font-size: 12px;\n  font-weight: 600;\n  color: var(--isbn-gray-600);\n  cursor: pointer;\n  transition: var(--isbn-trans);\n  font-family: var(--isbn-font);\n}\n.isbn-show-more-btn:hover { background: var(--isbn-navy); color: #fff; border-color: var(--isbn-navy); }\n.isbn-show-more-btn .acc-chevron { transition: transform 0.3s ease; font-size: 10px; }\n.isbn-show-more-btn.open .acc-chevron { transform: rotate(180deg); }\n\n.isbn-extended-grid {\n  max-height: 0;\n  overflow: hidden;\n  transition: max-height 0.4s cubic-bezier(0.4,0,0.2,1);\n}\n.isbn-extended-grid.open { max-height: 600px; }\n.isbn-extended-inner { padding-top: 10px; }\n\n\/* \u2500\u2500 ACTION CARDS \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-actions-grid {\n  display: grid;\n  grid-template-columns: 1fr 1fr;\n  gap: 10px;\n}\n@media (max-width: 500px) { .isbn-actions-grid { grid-template-columns: 1fr; } }\n\n.isbn-action-card {\n  display: flex;\n  align-items: center;\n  gap: 12px;\n  padding: 14px 16px;\n  border: 1.5px solid var(--isbn-gray-200);\n  border-radius: var(--isbn-radius-sm);\n  background: var(--isbn-white);\n  cursor: pointer;\n  transition: var(--isbn-trans);\n  font-family: var(--isbn-font);\n  text-decoration: none;\n}\n.isbn-action-card:hover {\n  border-color: var(--isbn-blue-lt);\n  background: var(--isbn-blue-pale);\n  transform: translateY(-1px);\n  box-shadow: var(--isbn-shadow);\n  text-decoration: none;\n}\n.isbn-action-icon {\n  width: 38px;\n  height: 38px;\n  border-radius: 10px;\n  display: flex;\n  align-items: center;\n  justify-content: center;\n  font-size: 18px;\n  flex-shrink: 0;\n}\n.isbn-action-icon.green  { background: var(--isbn-green-lt); }\n.isbn-action-icon.blue   { background: var(--isbn-blue-pale); }\n.isbn-action-icon.amber  { background: #fef3c7; }\n.isbn-action-icon.slate  { background: var(--isbn-gray-100); }\n.isbn-action-meta { flex: 1; min-width: 0; }\n.isbn-action-label { font-size: 13px; font-weight: 700; color: var(--isbn-gray-800); line-height: 1.2; }\n.isbn-action-sub   { font-size: 11px; color: var(--isbn-gray-400); margin-top: 1px; }\n\n\/* NLN card \u2014 full width, distinct green *\/\n.isbn-nln-card {\n  display: flex;\n  align-items: center;\n  gap: 12px;\n  padding: 14px 18px;\n  background: linear-gradient(135deg, #14532d 0%, #166534 100%);\n  border-radius: var(--isbn-radius-sm);\n  cursor: pointer;\n  transition: var(--isbn-trans);\n  border: none;\n  width: 100%;\n  font-family: var(--isbn-font);\n  text-align: left;\n}\n.isbn-nln-card:hover { filter: brightness(1.1); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(22,101,52,0.35); }\n.isbn-nln-icon { font-size: 22px; }\n.isbn-nln-label { font-size: 14px; font-weight: 700; color: #fff; }\n.isbn-nln-sub { font-size: 11px; color: rgba(255,255,255,0.65); margin-top: 1px; }\n\n\/* \u2500\u2500 UPSELL NOTE \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-upsell {\n  background: var(--isbn-green-lt);\n  border: 1.5px solid var(--isbn-green-bd);\n  border-radius: var(--isbn-radius-sm);\n  padding: 12px 16px;\n  display: flex;\n  align-items: center;\n  gap: 10px;\n}\n.isbn-upsell-text { font-size: 12px; color: var(--isbn-green); line-height: 1.5; }\n.isbn-upsell-text a { color: var(--isbn-green); font-weight: 700; text-decoration: underline; }\n.isbn-upsell-text a:hover { color: var(--isbn-navy); }\n\n\/* \u2500\u2500 BARCODE NOTE \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-barcode-note {\n  font-size: 12px;\n  color: var(--isbn-gray-400);\n  text-align: center;\n  line-height: 1.6;\n}\n.isbn-barcode-note a { color: var(--isbn-blue); font-weight: 600; text-decoration: none; }\n.isbn-barcode-note a:hover { text-decoration: underline; }\n\n\/* \u2500\u2500 HISTORY \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-history-empty {\n  font-size: 12px;\n  color: var(--isbn-gray-400);\n  font-style: italic;\n}\n\n\/* \u2500\u2500 BOTTOM CTA BADGE \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-bottom-cta {\n  background: var(--isbn-blue-pale);\n  border: 1.5px solid #bfdbfe;\n  border-radius: var(--isbn-radius-sm);\n  padding: 12px 16px;\n  text-align: center;\n  font-size: 13px;\n  color: var(--isbn-gray-600);\n}\n.isbn-bottom-cta a { color: var(--isbn-blue); font-weight: 700; text-decoration: none; }\n.isbn-bottom-cta a:hover { text-decoration: underline; }\n\n\/* \u2500\u2500 TOOL FOOTER PADDING \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-footer-pad { height: 28px; }\n\n\/* \u2500\u2500 GLOBAL SKELETON \/ LOADING \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-loading {\n  display: inline-flex;\n  align-items: center;\n  gap: 8px;\n  font-size: 12px;\n  color: var(--isbn-gray-400);\n  padding: 10px 0;\n}\n.isbn-spinner {\n  width: 16px; height: 16px;\n  border: 2px solid var(--isbn-gray-200);\n  border-top-color: var(--isbn-blue);\n  border-radius: 50%;\n  animation: isbnSpin 0.7s linear infinite;\n}\n@keyframes isbnSpin { to { transform: rotate(360deg); } }\n\n\/* \u2500\u2500 RESPONSIVE BODY PADDING \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n@media (max-width: 480px) {\n  .isbn-section { padding: 16px 18px 0; }\n}\n<\/style>\n\n<!-- ============================================================\n     MARKUP\n============================================================ -->\n<div class=\"ace-tool\">\n\n  <!-- Shared header (manually implemented per toolkit standard) -->\n  \n<div class=\"ace-header\">\n  <div class=\"ace-header-inner\">\n\n    <!-- Left: identity block -->\n    <div class=\"ace-header-identity\">\n\n            <span class=\"ace-header-badge badge-default\">\n        ISBN      <\/span>\n      \n      <h2 class=\"ace-header-title\">ISBN Validator<\/h2>\n\n            <p class=\"ace-header-subtitle\">The tool helps authors, self-publishers, and booksellers verify if an ISBN is correctly formatted and valid.<\/p>\n      \n    <\/div><!-- \/.ace-header-identity -->\n\n    <!-- Right: CTA button -->\n    <a href=\"https:\/\/aceworldpgs.com\/acepublishingchecklist\" class=\"ace-header-cta\" target=\"_blank\" rel=\"noopener\">\n      Download Publishing Checklist            <span class=\"ace-cta-badge\">\u2b07<\/span>\n          <\/a>\n\n  <\/div><!-- \/.ace-header-inner -->\n<\/div><!-- \/.ace-header -->\n\n\n        \n  <div class=\"isbn-shell\">\n\n    <!-- Bulk mode switcher -->\n    <div class=\"isbn-bulk-banner\">\n      <a href=\"https:\/\/aceworldpgs.com\/tools\/bulk-isbn-validator\/\" class=\"isbn-bulk-link\">\n        Switch to Bulk Mode\n        <span class=\"isbn-pro-tag\">PRO<\/span>\n      <\/a>\n    <\/div>\n\n    <!-- \u2500\u2500 INPUT \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n    <div class=\"isbn-input-area\">\n      <label class=\"isbn-input-label\" for=\"isbnInput\">Enter ISBN-10 or ISBN-13<\/label>\n      <form onsubmit=\"isbnValidate(); return false;\" class=\"isbn-input-row\">\n        <div class=\"isbn-input-wrap\">\n          <span class=\"isbn-prefix\">ISBN<\/span>\n          <input type=\"text\"\n                 id=\"isbnInput\"\n                 placeholder=\"e.g. 9780747532743\"\n                 autocomplete=\"off\"\n                 autocorrect=\"off\"\n                 spellcheck=\"false\"\n                 inputmode=\"numeric\"\n                 maxlength=\"17\"\n                 required>\n        <\/div>\n        <button type=\"submit\"\n                class=\"isbn-validate-btn\"\n                onclick=\"trackTool('isbn_validator')\">\n          <span class=\"btn-icon\">\ud83d\udd0d<\/span>\n          Validate\n        <\/button>\n      <\/form>\n    <\/div>\n\n    <!-- \u2500\u2500 RESULT \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n    <div class=\"isbn-result-area\">\n      <div id=\"isbnResultToast\"><\/div>\n    <\/div>\n\n    <!-- \u2500\u2500 BOOK PREVIEW \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n    <div id=\"isbnBookCard\"><\/div>\n\n    <!-- \u2500\u2500 SEARCH LITERARY DATABASES \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n    <div class=\"isbn-section\">\n      <div class=\"isbn-section-header\">\n        <span class=\"isbn-section-title\">Search Literary Databases<\/span>\n        <span class=\"isbn-section-line\"><\/span>\n      <\/div>\n      <div class=\"isbn-db-grid\" id=\"majorStoreList\"><\/div>\n\n      <button class=\"isbn-show-more-btn\" id=\"accBtn\" onclick=\"isbnToggleAccordion()\">\n        <span>Show More Platforms<\/span>\n        <span class=\"acc-chevron\">\u25bc<\/span>\n      <\/button>\n\n      <div class=\"isbn-extended-grid\" id=\"extendedAccordion\">\n        <div class=\"isbn-extended-inner\">\n          <div class=\"isbn-db-grid\" id=\"extendedStoreList\"><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n\n    <!-- \u2500\u2500 UPSELL \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n    <div class=\"isbn-section\">\n      <div class=\"isbn-upsell\">\n        <span style=\"font-size:18px;\">\ud83d\udcda<\/span>\n        <span class=\"isbn-upsell-text\">\n          Want your books on these bookstores?\n          <a href=\"https:\/\/aceworldpgs.com\/tools\/publishing-calculator\/\">Get a publishing quotation \u2192<\/a>\n        <\/span>\n      <\/div>\n    <\/div>\n\n    <!-- \u2500\u2500 ACTIONS \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n    <div class=\"isbn-section\">\n      <div class=\"isbn-section-header\">\n        <span class=\"isbn-section-title\">Actions<\/span>\n        <span class=\"isbn-section-line\"><\/span>\n      <\/div>\n\n      <div class=\"isbn-actions-grid\" style=\"margin-bottom:10px;\">\n\n        <!--<button class=\"isbn-action-card\" onclick=\"isbnCheckAndRun(isbnCopyClean)\">\n          <div class=\"isbn-action-icon blue\">\ud83d\udccb<\/div>\n          <div class=\"isbn-action-meta\">\n            <div class=\"isbn-action-label\">Copy Clean ISBN<\/div>\n            <div class=\"isbn-action-sub\">Digits only, no hyphens<\/div>\n          <\/div>\n        <\/button>-->\n\n        <a class=\"isbn-action-card\" onclick=\"isbnCheckAndRun(isbnCopyClean)\">\n          <div class=\"isbn-action-icon blue\">\ud83d\udccb<\/div>\n          <div class=\"isbn-action-meta\">\n            <div class=\"isbn-action-label\">Copy Clean ISBN<\/div>\n            <div class=\"isbn-action-sub\">Digits only, no hyphens<\/div>\n          <\/div>\n        <\/a>\n\n        <a href=\"https:\/\/aceworldpgs.com\/tools\/barcode-qr-code-generator\/\"\n           class=\"isbn-action-card\"\n           target=\"_blank\" rel=\"noopener noreferrer\">\n          <div class=\"isbn-action-icon amber\">\u2b07\ufe0f<\/div>\n          <div class=\"isbn-action-meta\">\n            <div class=\"isbn-action-label\">Download Barcode<\/div>\n            <div class=\"isbn-action-sub\">Generate an ISBN barcode<\/div>\n          <\/div>\n        <\/a>\n\n      <a class=\"isbn-action-card\" onclick=\"trackTool('NLN_verifier'); isbnCheckAndRun(isbnSearchNLN)\">\n        <span class=\"isbn-nln-icon\">\ud83c\uddf3\ud83c\uddec<\/span>\n        <div>\n          <div class=\"isbn-action-label\">Check NLN Registry<\/div>\n          <div class=\"isbn-action-sub\">Search National Library of Nigeria<\/div>\n        <\/div>\n      <\/a>\n\n      <\/div>\n      <!-- NLN \u2014 full-width card -->\n      <!--<button class=\"isbn-nln-card\" onclick=\"trackTool('NLN_verifier'); isbnCheckAndRun(isbnSearchNLN)\">\n        <span class=\"isbn-nln-icon\">\ud83c\uddf3\ud83c\uddec<\/span>\n        <div>\n          <div class=\"isbn-nln-label\">Check National Library of Nigeria<\/div>\n          <div class=\"isbn-nln-sub\">Search the official Nigerian ISBN registry<\/div>\n        <\/div>\n      <\/button>-->\n    <\/div>\n\n    <!-- \u2500\u2500 RECENT SEARCHES \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n    <div class=\"isbn-section\">\n      <div class=\"isbn-section-header\">\n        <span class=\"isbn-section-title\">Recent Searches<\/span>\n        <span class=\"isbn-section-line\"><\/span>\n      <\/div>\n      <div class=\"isbn-db-grid\" id=\"historyList\">\n        <span class=\"isbn-history-empty\">No recent searches yet.<\/span>\n      <\/div>\n    <\/div>\n\n    <!-- \u2500\u2500 BOTTOM CTA \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n    <div class=\"isbn-section\">\n      <div class=\"isbn-bottom-cta\">\n        Need a valid ISBN for your book?\n        <a href=\"https:\/\/aceworldpgs.com\/tools\/publishing-calculator\/\" target=\"_blank\">Contact us \u2192<\/a>\n      <\/div>\n    <\/div>\n\n    <div class=\"isbn-footer-pad\"><\/div>\n\n  <\/div><!-- \/.isbn-shell -->\n<\/div><!-- \/.ace-tool -->\n\n\n<style>\n\n\/* SHARE SECTION *\/\n\n.share-section{\ntext-align:center;\npadding:28px 0;\nmargin-top:30px;\nborder-top:1px solid #e5e7eb;\n}\n\n\/* COPY LINK BUTTON *\/\n\n.copy-link-btn{\ndisplay:inline-flex;\nalign-items:center;\ngap:6px;\nfont-size:14px;\nfont-weight:600;\ncolor:var(--text-main);\nbackground:#f8fafc;\npadding:6px 12px;\nborder-radius:6px;\ntext-decoration:none;\ncursor:pointer;\ntransition:all .2s ease;\nmargin-bottom:18px;\n}\n\n.copy-link-btn:hover{\nbackground:#eef2f7;\ntransform:translateY(-1px);\n}\n\n\/* SHARE BUTTON ROW *\/\n\n.share-btns{\ndisplay:flex;\njustify-content:center;\ngap:12px;\nflex-wrap:wrap;\n}\n\n\/* SHARE ICON *\/\n\n.share-icon{\nwidth:36px;\nheight:36px;\nborder-radius:50%;\ndisplay:flex;\nalign-items:center;\njustify-content:center;\ncolor:#fff;\nfont-size:14px;\nfont-weight:600;\ntext-decoration:none;\ntransition:all .2s ease;\n}\n\n\/* BRAND COLORS *\/\n\n.wa{background:#25D366;}\n.tw{background:#000;}\n.li{background:#0A66C2;}\n.fb{background:#1877F2;}\n.ml{background:#ef4444;}\n\n\/* HOVER EFFECT *\/\n\n.share-icon:hover{\ntransform:translateY(-2px) scale(1.05);\nopacity:.9;\n}\n\n\/* COPY FEEDBACK *\/\n\n.copy-feedback{\nfont-size:12px;\ncolor:#16a34a;\nmargin-top:10px;\ndisplay:none;\n}\n\n<\/style>\n\n\n<div class=\"share-section\">\n\n<a onclick=\"copyToolLink()\" class=\"copy-link-btn\" id=\"copyBtn\">\n\ud83d\udd17 Copy Page Link\n<\/a>\n\n<div class=\"share-btns\">\n<a href=\"#\" id=\"shareWA\" target=\"_blank\" class=\"share-icon wa\" title=\"Share on WhatsApp\">W<\/a>\n<a href=\"#\" id=\"shareTW\" target=\"_blank\" class=\"share-icon tw\" title=\"Share on X\">X<\/a>\n<a href=\"#\" id=\"shareLI\" target=\"_blank\" class=\"share-icon li\" title=\"Share on LinkedIn\">in<\/a>\n<a href=\"#\" id=\"shareFB\" target=\"_blank\" class=\"share-icon fb\" title=\"Share on Facebook\">f<\/a>\n<a href=\"#\" id=\"shareEmail\" target=\"_blank\" class=\"share-icon ml\" title=\"Share via Email\">M<\/a>\n<\/div>\n\n<div id=\"copyFeedback\" class=\"copy-feedback\">Link copied!<\/div>\n\n<\/div>\n\n\n<script>\n\nfunction copyToolLink(){\n\nconst url = window.location.href;\n\nnavigator.clipboard.writeText(url).then(()=>{\n\nconst f = document.getElementById(\"copyFeedback\");\n\nf.style.display=\"block\";\n\nsetTimeout(()=>{f.style.display=\"none\"},2000);\n\n}).catch(()=>{\n\nalert(\"Copy failed. Please copy the URL manually.\");\n\n});\n\n}\n\nfunction setupShareButtons(){\n\nlet pageUrl=encodeURIComponent(window.location.href)\nlet pageTitle=encodeURIComponent(document.title)\n\ndocument.getElementById(\"shareWA\").href=\n`https:\/\/wa.me\/?text=${pageTitle}%20${pageUrl}`\n\ndocument.getElementById(\"shareTW\").href=\n`https:\/\/twitter.com\/intent\/tweet?text=${pageTitle}&url=${pageUrl}`\n\ndocument.getElementById(\"shareLI\").href=\n`https:\/\/www.linkedin.com\/sharing\/share-offsite\/?url=${pageUrl}`\n\ndocument.getElementById(\"shareFB\").href=\n`https:\/\/www.facebook.com\/sharer\/sharer.php?u=${pageUrl}`\n\ndocument.getElementById(\"shareEmail\").href=\n\"mailto:?subject=\"+encodeURIComponent(document.title)+\n\"&body=\"+encodeURIComponent(\"Check out this page: \"+window.location.href)\n\n}\n\nsetupShareButtons()\n\n<\/script>\n\n\n <!--\n\n<style>\n\n\/* SIMILAR TOOLS *\/\n\n.similar-tools{\nmargin-top:40px;\npadding-top:20px;\nborder-top:1px solid #e5e7eb;\n}\n\n.similar-tools h3{\nfont-size:18px;\nfont-weight:700;\nmargin-bottom:16px;\n}\n\n.similar-grid{\ndisplay:grid;\ngrid-template-columns:repeat(3,1fr);\ngap:12px;\nmargin-top: 15px;\nmargin-bottom: 15px;\nmargin-left: 20px;\nmargin-right: 20px;\n}\n\n.similar-card{\ndisplay:flex;\nalign-items:center;\ngap:10px;\npadding:12px;\nborder:1px solid #e5e7eb;\nborder-radius:8px;\ntext-decoration:none;\ncolor:inherit;\nbackground:#fff;\ntransition:all .15s ease;\n}\n\n.similar-card:hover{\nborder-color:#cbd5e1;\nbackground:#f8fafc;\ntransform:translateY(-2px);\n}\n\n\/* icon *\/\n\n.similar-icon{\nwidth:32px;\nheight:32px;\nborder-radius:6px;\nbackground:#eff6ff;\ndisplay:flex;\nalign-items:center;\njustify-content:center;\nfont-size:16px;\nflex-shrink:0;\n}\n\n\/* text *\/\n\n.similar-title{\nfont-size:14px;\nfont-weight:600;\nline-height:1.2;\n}\n\n@media(max-width:700px){\n.similar-grid{\ngrid-template-columns:1fr;\n}\n}\n\n.browse-tools-btn{\n    display:inline-block;\n    padding:10px 18px;\n    border-radius:8px;\n    border:1px solid #e5e7eb;\n    background:#fff;\n    text-decoration:none;\n    font-size:16px;\n    font-weight:600;\n    color:inherit;\n    transition:all .15s ease;\n}\n\n.browse-tools-btn:hover{\n    background:#f8fafc;\n    border-color:#d1d5db;\n    transform:translateY(-1px);\n}\n\n<\/style>\n\n\n<div class=\"similar-tools\">\n\n<h2 style=\"text-align: center;\">Other tools<\/h2>\n\n<div class=\"similar-grid\">\n\n<a href=\"\/tools\/manuscript-development-calculator\/\" class=\"similar-card\">\n<div class=\"similar-icon\">#<\/div>\n<div class=\"similar-title\">Manusript Development Calculator<\/div>\n<\/a>\n\n<a href=\"\/tools\/publishing-calculator\/\" class=\"similar-card\">\n<div class=\"similar-icon\">#<\/div>\n<div class=\"similar-title\">Publishing Calculator<\/div>\n<\/a>\n\n<a href=\"\/tools\/isbn-validator\/\" class=\"similar-card\">\n<div class=\"similar-icon\">#<\/div>\n<div class=\"similar-title\">ISBN Validator<\/div>\n<\/a>\n\n<a href=\"\/tools\/bulk-isbn-validator\/\" class=\"similar-card\">\n<div class=\"similar-icon\">#<\/div>\n<div class=\"similar-title\">Bulk ISBN Validator<\/div>\n<\/a>\n\n<a href=\"\/tools\/book-cover-calculator\/\" class=\"similar-card\">\n<div class=\"similar-icon\">#<\/div>\n<div class=\"similar-title\">Book Cover Calculator<\/div>\n<\/a>\n\n<a href=\"\/tools\/book-metadata-generator\/\" class=\"similar-card\">\n<div class=\"similar-icon\">#<\/div>\n<div class=\"similar-title\">Book Metadata Generator<\/div>\n<\/a>\n\n<a href=\"\/tools\/advert-policy-checks\/\" class=\"similar-card\">\n<div class=\"similar-icon\">#<\/div>\n<div class=\"similar-title\">Meta Ad Policy Checker<\/div>\n<\/a>\n\n<a href=\"\/tools\/barcode-qr-code-generator\/\" class=\"similar-card\">\n<div class=\"similar-icon\">#<\/div>\n<div class=\"similar-title\">Barcode & QR Code Generator<\/div>\n<\/a>\n\n<a href=\"\/tools\/book-royalty-calculator\/\" class=\"similar-card\">\n<div class=\"similar-icon\">#<\/div>\n<div class=\"similar-title\">Book Royalty Calculator<\/div>\n<\/a>\n\n<a href=\"\/tools\/book-price-calculator\/\" class=\"similar-card\">\n<div class=\"similar-icon\">#<\/div>\n<div class=\"similar-title\">Book Price Calculator<\/div>\n<\/a>\n\n<\/div>\n\n<p style=\"text-align:center;\"><a href=\"https:\/\/aceworldpgs.com\/tools\/all\/\" class=\"browse-tools-btn\">Browse All Tools \u2192<\/a>\n<\/p>\n\n<\/div>\n\n\n-->\n\n\n\n<!-- ============================================================\n     JAVASCRIPT \u2014 All original logic preserved, UI updated\n============================================================ -->\n<script>\n(function() {\n\n\/\/ \u2500\u2500 State \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nlet currentValidIsbn = '';\nconst TOOL_URL = window.location.href;\n\n\/\/ \u2500\u2500 Store data (unchanged from original) \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nconst majorStores = [\n  { name: 'Amazon',           url: 'https:\/\/www.amazon.com\/s?k=' },\n  { name: 'Google Books',     url: 'https:\/\/www.google.com\/search?tbm=bks&q=isbn:' },\n  { name: 'WorldCat',         url: 'https:\/\/www.worldcat.org\/search?q=' },\n  { name: 'Apple Books',      url: 'https:\/\/www.google.com\/search?q=site:books.apple.com+' },\n  { name: 'Barnes & Noble',   url: 'https:\/\/www.barnesandnoble.com\/s\/' },\n  { name: 'Kobo',             url: 'https:\/\/www.kobo.com\/search?query=' },\n];\n\nconst extendedStores = [\n  { name: 'Lulu',             url: 'https:\/\/www.lulu.com\/search?adult_audience_rating=00&q=' },\n  { name: 'Everand',          url: 'https:\/\/www.everand.com\/search?query=' },\n  { name: 'Overdrive',        url: 'https:\/\/www.overdrive.com\/search?q=' },\n  { name: 'BookScouter',      url: 'https:\/\/bookscouter.com\/book\/' },\n  { name: 'Goodreads',        url: 'https:\/\/www.goodreads.com\/search?q=' },\n  { name: 'AbeBooks',         url: 'https:\/\/www.abebooks.com\/servlet\/SearchResults?isbn=' },\n  { name: 'Audible',          url: 'https:\/\/www.audible.com\/search?keywords=' },\n  { name: 'Indigo',           url: 'https:\/\/www.indigo.ca\/en-ca\/search\/?q=' },\n  { name: 'bol.',             url: 'https:\/\/www.bol.com\/nl\/nl\/s\/?searchtext=' },\n  { name: 'Scribd',           url: 'https:\/\/www.scribd.com\/search?query=' },\n  { name: 'Bookmate',         url: 'https:\/\/bookmate.com\/search?q=' },\n  { name: 'Libri',            url: 'https:\/\/www.libri.hu\/talalati_lista\/?szo=' },\n  { name: 'Bookshop.org',     url: 'https:\/\/bookshop.org\/search?keywords=' },\n  { name: 'Alibris',          url: 'https:\/\/www.alibris.com\/booksearch?keyword=' },\n  { name: 'Fnac',             url: 'https:\/\/www.fnac.com\/SearchResult\/ResultList.aspx?Search=' },\n  { name: 'Booktopia',        url: 'https:\/\/www.booktopia.com.au\/search.ep?keywords=' },\n  { name: 'Storytel',         url: 'https:\/\/www.storytel.com\/tv\/search?query=' },\n  { name: 'Libristo (EU)',    url: 'https:\/\/www.libristo.eu\/en\/search?q=' },\n  { name: 'World of Books',   url: 'https:\/\/www.worldofbooks.com\/de-ch\/search?q=' },\n  { name: 'Routledge',        url: 'https:\/\/www.routledge.com\/search?kw=' },\n  { name: 'ISBN Search',      url: 'https:\/\/isbnsearch.org\/isbn\/' },\n  { name: 'Bing',             url: 'https:\/\/www.bing.com\/search?q=' },\n  { name: 'Google',           url: 'https:\/\/www.google.com\/search?q=' },\n];\n\n\/\/ \u2500\u2500 Guard: require validated ISBN before action \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nfunction isbnCheckAndRun(fn) {\n  if (!currentValidIsbn) {\n    showToast('error', '\u26a0\ufe0f', 'No ISBN validated', 'Please enter and validate an ISBN first.');\n    document.getElementById('isbnInput').focus();\n    return;\n  }\n  fn();\n}\n\n\/\/ \u2500\u2500 Store click handler \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nfunction handleStoreClick(id, url) {\n  isbnCheckAndRun(() => {\n    const pill = document.getElementById('pill-' + id);\n    window.open(url + currentValidIsbn, '_blank');\n    if (pill) pill.classList.add('checked');\n    logStoreClickToWordPress(currentValidIsbn, pill ? pill.textContent.trim() : id);\n  });\n}\n\nasync function logStoreClickToWordPress(isbn, storeName) {\n  const fd = new FormData();\n  fd.append('action',         'save_isbn_usage');\n  fd.append('isbn',           isbn);\n  fd.append('clicked_store',  storeName);\n  fd.append('is_click_event', '1');\n  fetch('\/wp-admin\/admin-ajax.php', { method: 'POST', body: fd });\n}\n\n\/\/ \u2500\u2500 Accordion \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nfunction isbnToggleAccordion() {\n  const content = document.getElementById('extendedAccordion');\n  const btn     = document.getElementById('accBtn');\n  content.classList.toggle('open');\n  btn.classList.toggle('open');\n}\n\n\/\/ \u2500\u2500 Populate store pills \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nfunction populateStores() {\n  const makeHtml = (s) => {\n    const id = s.name.replace(\/[^a-zA-Z]\/g, '');\n    return `<button id=\"pill-${id}\" class=\"isbn-db-pill\" onclick=\"handleStoreClick('${id}','${s.url}')\">${s.name}<\/button>`;\n  };\n  const maj = document.getElementById('majorStoreList');\n  const ext = document.getElementById('extendedStoreList');\n  if (maj) maj.innerHTML = majorStores.map(makeHtml).join('');\n  if (ext) ext.innerHTML = extendedStores.map(makeHtml).join('');\n}\n\n\/\/ \u2500\u2500 Toast helper \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nfunction showToast(type, icon, title, body) {\n  const el = document.getElementById('isbnResultToast');\n  if (!el) return;\n  el.innerHTML = `\n    <div class=\"isbn-result-toast ${type}\">\n      <span class=\"isbn-toast-icon\">${icon}<\/span>\n      <div class=\"isbn-toast-content\">\n        <div class=\"isbn-toast-title ${type}\">${title}<\/div>\n        ${body ? '<div class=\"isbn-toast-body\">' + body + '<\/div>' : ''}\n      <\/div>\n    <\/div>`;\n}\n\n\/\/ \u2500\u2500 Main validation \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nfunction isbnValidate() {\n  let raw  = (document.getElementById('isbnInput').value || '').replace(\/-\/g, '').trim();\n  const inputEl = document.getElementById('isbnInput');\n  const bookEl  = document.getElementById('isbnBookCard');\n\n  \/\/ Reset state\n  document.querySelectorAll('.isbn-db-pill').forEach(p => p.classList.remove('checked'));\n  if (bookEl) bookEl.innerHTML = '';\n  currentValidIsbn = '';\n  inputEl.className = '';\n  document.getElementById('isbnResultToast').innerHTML = '';\n\n  \/\/ Convert ISBN-10 \u2192 ISBN-13\n  if (raw.length === 10) {\n    const temp = '978' + raw.substring(0, 9);\n    let sum = 0;\n    for (let i = 0; i < 12; i++) sum += (i % 2 === 0) ? parseInt(temp[i]) : parseInt(temp[i]) * 3;\n    const check = (10 - (sum % 10)) % 10;\n    raw = temp + check;\n    showToast('info', '\u2139\ufe0f', '10-digit ISBN detected',\n      'Converted to ISBN-13: <strong style=\"font-family:var(--isbn-mono);\">' + raw + '<\/strong>');\n  }\n\n  if (raw.length !== 13 || !\/^\\d+$\/.test(raw)) {\n    inputEl.classList.add('invalid-state');\n    showToast('error', '\u2717', 'Invalid format', 'Please enter a valid 10 or 13-digit ISBN (digits only or with hyphens).');\n    return;\n  }\n\n  \/\/ Checksum validation\n  let sum = 0;\n  for (let i = 0; i < 12; i++) sum += (i % 2 === 0) ? parseInt(raw[i]) : parseInt(raw[i]) * 3;\n  const expected = (10 - (sum % 10)) % 10;\n\n  if (expected !== parseInt(raw[12])) {\n    inputEl.classList.add('invalid-state');\n    showToast('error', '\u2717', 'Invalid checksum',\n      'The check digit for <strong style=\"font-family:var(--isbn-mono);\">' + raw + '<\/strong> is incorrect. This ISBN may contain a typo.');\n    return;\n  }\n\n  \/\/ Valid \u2014 determine origin\n  let origin = 'International';\n  if (raw.startsWith('978978'))           origin = 'Nigerian';\n  else {\n    const core = raw.substring(3);\n    if (core.startsWith('0') || core.startsWith('1')) origin = 'English (USA \/ UK)';\n    else if (core.startsWith('2'))         origin = 'French';\n    else if (core.startsWith('3'))         origin = 'German';\n    else if (core.startsWith('4'))         origin = 'Japanese';\n  }\n\n  currentValidIsbn = raw;\n  inputEl.classList.add('valid-state');\n\n  \/\/ Format for display: 978-X-XXXXX-XXX-X\n  const fmt = raw.substring(0,3) + '-' + raw[3] + '-' + raw.substring(4,9) + '-' + raw.substring(9,12) + '-' + raw[12];\n\n  document.getElementById('isbnResultToast').innerHTML = `\n    <div class=\"isbn-result-toast success\">\n      <span class=\"isbn-toast-icon\">\u2713<\/span>\n      <div class=\"isbn-toast-content\">\n        <div class=\"isbn-toast-title success\">Valid ${origin} ISBN<\/div>\n        <div class=\"isbn-toast-body\">Click a platform below to check if this number has been published.<\/div>\n        <div class=\"isbn-number-display\">\n          ${fmt}\n          <button class=\"isbn-copy-pill\" onclick=\"isbnCopyClean()\" id=\"copyPillBtn\">\ud83d\udccb Copy<\/button>\n        <\/div>\n      <\/div>\n    <\/div>`;\n\n  logUsageToWordPress(raw, origin);\n  fetchBookMetadata(raw);\n  saveToHistory(raw);\n}\n\n\/\/ \u2500\u2500 Copy clean ISBN \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nfunction isbnCopyClean() {\n  if (!currentValidIsbn) return;\n  navigator.clipboard.writeText(currentValidIsbn).then(() => {\n    const btn = document.getElementById('copyPillBtn');\n    if (btn) {\n      const orig = btn.textContent;\n      btn.textContent = '\u2713 Copied!';\n      setTimeout(() => { btn.textContent = orig; }, 2000);\n    }\n  });\n}\n\n\/\/ \u2500\u2500 NLN \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nfunction isbnSearchNLN() {\n  window.open('https:\/\/isbn.nln.gov.ng\/search\/index.php?search=' + currentValidIsbn + '&search_submit=', '_blank');\n}\n\n\/\/ \u2500\u2500 Book metadata fetch (Google \u2192 Open Library fallback) \u2500\nasync function fetchBookMetadata(isbn) {\n  const bookEl = document.getElementById('isbnBookCard');\n  if (!bookEl) return;\n\n  bookEl.innerHTML = '<div class=\"isbn-section\" style=\"padding-top:14px;\"><div class=\"isbn-loading\"><div class=\"isbn-spinner\"><\/div> Looking up book details\u2026<\/div><\/div>';\n\n  try {\n    const res  = await fetch('https:\/\/www.googleapis.com\/books\/v1\/volumes?q=isbn:' + isbn);\n    const data = await res.json();\n    if (data.totalItems > 0) {\n      const info  = data.items[0].volumeInfo;\n      const thumb = (info.imageLinks && info.imageLinks.thumbnail)\n                  ? info.imageLinks.thumbnail\n                  : 'https:\/\/via.placeholder.com\/70x100?text=No+Cover';\n      bookEl.innerHTML = buildBookCard(thumb, info.title, (info.authors || []).join(', '), 'Google Books');\n      return;\n    }\n  } catch (e) { \/* fall through *\/ }\n\n  try {\n    const olRes  = await fetch('https:\/\/openlibrary.org\/api\/books?bibkeys=ISBN:' + isbn + '&format=json&jscmd=data');\n    const olData = await olRes.json();\n    const key    = 'ISBN:' + isbn;\n    if (olData && olData[key]) {\n      const info    = olData[key];\n      const thumb   = (info.cover && (info.cover.medium || info.cover.small))\n                    ? (info.cover.medium || info.cover.small)\n                    : 'https:\/\/via.placeholder.com\/70x100?text=No+Cover';\n      const authors = info.authors ? info.authors.map(a => a.name).join(', ') : 'Unknown';\n      bookEl.innerHTML = buildBookCard(thumb, info.title, authors, 'Open Library');\n      return;\n    }\n  } catch (e) { \/* silent *\/ }\n\n  \/\/ No metadata found \u2014 clear the placeholder\n  bookEl.innerHTML = '';\n}\n\nfunction buildBookCard(thumb, title, author, source) {\n  return `\n    <div class=\"isbn-book-card\">\n      <img decoding=\"async\" src=\"${thumb}\" alt=\"Book cover\" class=\"isbn-book-cover\">\n      <div class=\"isbn-book-meta\">\n        <div class=\"isbn-book-title\">${title || 'Untitled'}<\/div>\n        <div class=\"isbn-book-author\">${author || 'Unknown author'}<\/div>\n        <div class=\"isbn-book-source\">Source: ${source}<\/div>\n      <\/div>\n    <\/div>`;\n}\n\n\/\/ \u2500\u2500 Usage logging \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nasync function logUsageToWordPress(isbn, isbnCountry) {\n  let geo = { country: 'Unknown', city: 'Unknown' };\n  try {\n    const res  = await fetch('https:\/\/ipapi.co\/json\/');\n    const data = await res.json();\n    geo.country = data.country_name || 'Unknown';\n    geo.city    = data.city         || 'Unknown';\n  } catch (e) { \/* silent *\/ }\n\n  const fd = new FormData();\n  fd.append('action',       'save_isbn_usage');\n  fd.append('isbn',         isbn);\n  fd.append('isbn_origin',  isbnCountry);\n  fd.append('country',      geo.country);\n  fd.append('city',         geo.city);\n  fetch('\/wp-admin\/admin-ajax.php', { method: 'POST', body: fd }).catch(() => {});\n}\n\n\/\/ \u2500\u2500 History \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nfunction saveToHistory(isbn) {\n  let history = [];\n  try { history = JSON.parse(localStorage.getItem('isbnHistory') || '[]'); } catch(e) {}\n  if (!history.includes(isbn)) {\n    history.unshift(isbn);\n    localStorage.setItem('isbnHistory', JSON.stringify(history.slice(0, 5)));\n  }\n  renderHistory();\n}\n\nfunction renderHistory() {\n  const container = document.getElementById('historyList');\n  if (!container) return;\n  let history = [];\n  try { history = JSON.parse(localStorage.getItem('isbnHistory') || '[]'); } catch(e) {}\n  if (history.length === 0) {\n    container.innerHTML = '<span class=\"isbn-history-empty\">No recent searches yet.<\/span>';\n    return;\n  }\n  container.innerHTML = history.map(num =>\n    `<button class=\"isbn-db-pill\" onclick=\"isbnLoadHistory('${num}')\">${num}<\/button>`\n  ).join('');\n}\n\nfunction isbnLoadHistory(num) {\n  document.getElementById('isbnInput').value = num;\n  isbnValidate();\n}\n\n\/\/ \u2500\u2500 Expose globals needed by inline onclick attributes \u2500\u2500\u2500\u2500\nwindow.handleStoreClick      = handleStoreClick;\nwindow.isbnToggleAccordion   = isbnToggleAccordion;\nwindow.isbnValidate          = isbnValidate;\nwindow.isbnCopyClean         = isbnCopyClean;\nwindow.isbnCheckAndRun       = isbnCheckAndRun;\nwindow.isbnSearchNLN         = isbnSearchNLN;\nwindow.isbnLoadHistory       = isbnLoadHistory;\n\n\/\/ \u2500\u2500 Init \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\npopulateStores();\nrenderHistory();\n\n})(); \/\/ end IIFE\n<\/script>\n\n<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<style>.kt-accordion-id4551_76be9a-62 .kt-accordion-inner-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:10px;}.kt-accordion-id4551_76be9a-62 .kt-accordion-panel-inner{border-top:0px solid transparent;border-right:0px solid transparent;border-bottom:0px solid transparent;border-left:0px solid transparent;background:#ffffff;padding-top:var(--global-kb-spacing-sm, 1.5rem);padding-right:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:var(--global-kb-spacing-sm, 1.5rem);padding-left:var(--global-kb-spacing-sm, 1.5rem);}.kt-accordion-id4551_76be9a-62 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:1px solid #f2f2f2;border-right:1px solid #f2f2f2;border-bottom:1px solid #f2f2f2;border-left:1px solid #f2f2f2;border-top-left-radius:6px;border-top-right-radius:6px;border-bottom-right-radius:6px;border-bottom-left-radius:6px;color:var(--global-palette3, #1A202C);padding-top:13px;padding-right:15px;padding-bottom:13px;padding-left:15px;}.kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap .kt-blocks-accordion-icon-trigger:before{background:var(--global-palette3, #1A202C);}.kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-icon-trigger{background:var(--global-palette3, #1A202C);}.kt-accordion-id4551_76be9a-62 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header:hover, \n\t\t\t\tbody:not(.hide-focus-outline) .kt-accordion-id4551_76be9a-62 .kt-blocks-accordion-header:focus-visible{color:#444444;background:#eeeeee;border-top:1px solid #878787;border-right:1px solid #878787;border-bottom:1px solid #878787;border-left:1px solid #878787;}.kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:before, body:not(.hide-focus-outline) .kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-blocks-accordion--visible .kt-blocks-accordion-icon-trigger:after, body:not(.hide-focus-outline) .kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:before{background:#444444;}.kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger, body:not(.hide-focus-outline) .kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger{background:#444444;}.kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:before, body:not(.hide-focus-outline) .kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:after, body:not(.hide-focus-outline) .kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:before{background:#eeeeee;}.kt-accordion-id4551_76be9a-62 .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id4551_76be9a-62 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{color:#ffffff;background:#BE530B;border-top:1px solid #BE530B;border-right:1px solid #BE530B;border-bottom:1px solid #BE530B;border-left:1px solid #BE530B;}.kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:before{background:#ffffff;}.kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger{background:#ffffff;}.kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id4551_76be9a-62:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:before{background:#BE530B;}@media all and (max-width: 1024px){.kt-accordion-id4551_76be9a-62 .kt-accordion-panel-inner{border-top:0px solid transparent;border-right:0px solid transparent;border-bottom:0px solid transparent;border-left:0px solid transparent;}}@media all and (max-width: 1024px){.kt-accordion-id4551_76be9a-62 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:1px solid #f2f2f2;border-right:1px solid #f2f2f2;border-bottom:1px solid #f2f2f2;border-left:1px solid #f2f2f2;}}@media all and (max-width: 1024px){.kt-accordion-id4551_76be9a-62 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header:hover, \n\t\t\t\tbody:not(.hide-focus-outline) .kt-accordion-id4551_76be9a-62 .kt-blocks-accordion-header:focus-visible{border-top:1px solid #878787;border-right:1px solid #878787;border-bottom:1px solid #878787;border-left:1px solid #878787;}}@media all and (max-width: 1024px){.kt-accordion-id4551_76be9a-62 .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id4551_76be9a-62 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{border-top:1px solid #BE530B;border-right:1px solid #BE530B;border-bottom:1px solid #BE530B;border-left:1px solid #BE530B;}}@media all and (max-width: 767px){.kt-accordion-id4551_76be9a-62 .kt-accordion-inner-wrap{display:block;}.kt-accordion-id4551_76be9a-62 .kt-accordion-inner-wrap .kt-accordion-pane:not(:first-child){margin-top:10px;}.kt-accordion-id4551_76be9a-62 .kt-accordion-panel-inner{border-top:0px solid transparent;border-right:0px solid transparent;border-bottom:0px solid transparent;border-left:0px solid transparent;}.kt-accordion-id4551_76be9a-62 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:1px solid #f2f2f2;border-right:1px solid #f2f2f2;border-bottom:1px solid #f2f2f2;border-left:1px solid #f2f2f2;}.kt-accordion-id4551_76be9a-62 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header:hover, \n\t\t\t\tbody:not(.hide-focus-outline) .kt-accordion-id4551_76be9a-62 .kt-blocks-accordion-header:focus-visible{border-top:1px solid #878787;border-right:1px solid #878787;border-bottom:1px solid #878787;border-left:1px solid #878787;}.kt-accordion-id4551_76be9a-62 .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id4551_76be9a-62 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{border-top:1px solid #BE530B;border-right:1px solid #BE530B;border-bottom:1px solid #BE530B;border-left:1px solid #BE530B;}}<\/style>\n<div class=\"wp-block-kadence-accordion alignnone\"><div class=\"kt-accordion-wrap kt-accordion-id4551_76be9a-62 kt-accordion-has-2-panes kt-active-pane-0 kt-accordion-block kt-pane-header-alignment-left kt-accodion-icon-style-basic kt-accodion-icon-side-right\" style=\"max-width:none\"><div class=\"kt-accordion-inner-wrap\" data-allow-multiple-open=\"false\" data-start-open=\"none\">\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-1 kt-pane4551_63b9bb-d1\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">How it Works<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<h2 class=\"wp-block-heading\">About ISBN Validator<\/h2>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">The&nbsp;<strong>ISBN Validator<\/strong>&nbsp;is a quick and reliable tool that helps authors, publishers, and booksellers verify whether an ISBN is correctly formatted and valid. An&nbsp;<strong>International Standard Book Number (ISBN)<\/strong>&nbsp;is a unique identifier assigned to books for cataloging, distribution, and sales across global book markets. Entering an incorrect ISBN can lead to listing errors, distribution problems, or difficulty tracking a book in databases.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With this tool, you can instantly check&nbsp;<strong>ISBN-10 and ISBN-13 numbers<\/strong>&nbsp;to confirm that they follow the correct mathematical structure and checksum rules. This makes it especially useful for authors preparing a book for publication or verifying ISBN details before submitting to distributors, libraries, or online retailers.<\/p>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">The ISBN Validator helps ensure your book\u2019s identification number is&nbsp;<strong>accurate, compliant, and ready for publishing and distribution<\/strong>. The tool also convert ISBN-10 to ISBN-13, generate barcode and search literary databases for book information.<\/p>\n\n\n\n<a id=\"policy\"><\/a>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-left\">Disclaimer<\/h2>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">The ISBN-13 Validator tool is provided and available without warranties of any kind, either express or implied. The tool is intended for general informational purposes only and should not be relied upon as the sole basis for making decisions.<\/p>\n\n\n\n<p class=\"has-text-align-left has-medium-font-size wp-block-paragraph\"><strong>By using the ISBN-13 Validator tool, you acknowledge that:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The tool is not intended to provide legal or professional advice.<\/li>\n\n\n\n<li> The accuracy and reliability of the tool&#8217;s results depend on the quality of the input data.<\/li>\n\n\n\n<li> The tool&#8217;s results do not constitute a guarantee or warranty of any kind.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-left\">Limitation of Liability<\/h2>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">In no event shall the developers, maintainers, or affiliates of the ISBN-13 Validator tool be liable for any damages, including but not limited to incidental, consequential, or punitive damages, arising out of the use of the tool.<\/p>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\"><strong>Barcode Credit:<\/strong> <a href=\"https:\/\/barcode.tec-it.com\/en\" target=\"_blank\" rel=\"noopener\">Online Barcode Generator<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-left\">Intellectual Property Rights<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The ISBN-13 Validator tool, including its source code and documentation, is protected by intellectual property laws and treaties. Any unauthorized use, reproduction, or distribution of the tool or its components may result in civil and criminal penalties.<\/p>\n<\/div><\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The free ISBN Validator tool helps you check if an ISBN is correct and further pulls book metadata from global literary databases. it also converts ISBN-10 to ISBN-13.<\/p>\n","protected":false},"author":1,"featured_media":73258,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kb_optimizer_status":2,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[15],"tags":[13,12,14],"class_list":["post-4551","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-isbn-tools","tag-fast","tag-free","tag-isbn"],"acf":[],"_links":{"self":[{"href":"https:\/\/aceworldpgs.com\/tools\/wp-json\/wp\/v2\/posts\/4551","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aceworldpgs.com\/tools\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aceworldpgs.com\/tools\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aceworldpgs.com\/tools\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aceworldpgs.com\/tools\/wp-json\/wp\/v2\/comments?post=4551"}],"version-history":[{"count":7,"href":"https:\/\/aceworldpgs.com\/tools\/wp-json\/wp\/v2\/posts\/4551\/revisions"}],"predecessor-version":[{"id":77190,"href":"https:\/\/aceworldpgs.com\/tools\/wp-json\/wp\/v2\/posts\/4551\/revisions\/77190"}],"wp:attachment":[{"href":"https:\/\/aceworldpgs.com\/tools\/wp-json\/wp\/v2\/media?parent=4551"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aceworldpgs.com\/tools\/wp-json\/wp\/v2\/categories?post=4551"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aceworldpgs.com\/tools\/wp-json\/wp\/v2\/tags?post=4551"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}