{"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\"><!-- ============================================================\n     SCHEMA \u2014 SoftwareApplication (WebApplication sub-type)\n============================================================ -->\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"WebApplication\",\n  \"name\": \"ISBN Validator\",\n  \"url\": \"https:\/\/aceworldpgs.com\/tools\/isbn-validator\/\",\n  \"description\": \"Free online ISBN validator. Instantly check whether any ISBN-10 or ISBN-13 is correctly formatted and has a valid check digit. Supports automatic ISBN-10 to ISBN-13 conversion.\",\n  \"applicationCategory\": \"UtilitiesApplication\",\n  \"operatingSystem\": \"Any\",\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"price\": \"0\",\n    \"priceCurrency\": \"NGN\"\n  },\n  \"publisher\": {\n    \"@type\": \"Organization\",\n    \"name\": \"ACEworld Publishers Limited\",\n    \"url\": \"https:\/\/aceworldpgs.com\"\n  }\n}\n<\/script>\n\n<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 (self-contained)\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  --v-navy:      #0f1c3f;\n  --v-blue:      #1d4ed8;\n  --v-blue-lt:   #3b82f6;\n  --v-blue-pale: #eff6ff;\n  --v-green:     #166534;\n  --v-green-lt:  #dcfce7;\n  --v-green-bd:  #86efac;\n  --v-red:       #dc2626;\n  --v-red-lt:    #fef2f2;\n  --v-red-bd:    #fca5a5;\n  --v-amber:     #f59e0b;\n  --v-amber-lt:  #fffbeb;\n  --v-white:     #ffffff;\n  --v-gray-50:   #f8fafc;\n  --v-gray-100:  #f1f5f9;\n  --v-gray-200:  #e2e8f0;\n  --v-gray-300:  #cbd5e1;\n  --v-gray-400:  #94a3b8;\n  --v-gray-600:  #475569;\n  --v-gray-800:  #1e293b;\n  --v-radius:    12px;\n  --v-radius-sm: 8px;\n  --v-shadow:    0 4px 24px rgba(15,28,63,0.08);\n  --v-shadow-lg: 0 12px 48px rgba(15,28,63,0.12);\n  --v-trans:     all 0.2s cubic-bezier(0.4,0,0.2,1);\n  --v-font:      'DM Sans', 'Segoe UI', system-ui, sans-serif;\n  --v-mono:      'DM Mono', 'Fira Code', ui-monospace, monospace;\n}\n\n\/* \u2500\u2500 TOOL WRAPPER \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\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-v-tool { max-width: 720px; margin: 0 auto; font-family: var(--v-font); }\n\n\/* \u2500\u2500 ACE HEADER \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\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-v-header {\n  background: linear-gradient(135deg, var(--v-navy) 0%, #1e3a7a 100%);\n  padding: 28px 32px 24px;\n  border-radius: 20px 20px 0 0;\n  position: relative;\n  overflow: hidden;\n}\n.isbn-v-header::after {\n  content: ''; position: absolute;\n  right: -60px; top: -60px;\n  width: 220px; height: 220px; border-radius: 50%;\n  background: rgba(59,130,246,0.12); pointer-events: none;\n}\n.isbn-v-header-inner {\n  display: flex; align-items: flex-start;\n  justify-content: space-between; gap: 16px; flex-wrap: wrap;\n  position: relative; z-index: 1;\n}\n.isbn-v-badge {\n  display: inline-flex; align-items: center; gap: 5px;\n  padding: 3px 10px; border-radius: 20px;\n  font-size: 10px; font-weight: 800; text-transform: uppercase;\n  letter-spacing: 0.08em; color: #fff; width: fit-content; margin-bottom: 8px;\n  background: rgba(245,158,11,0.35); border: 1px solid rgba(245,158,11,0.6);\n}\n.isbn-v-title {\n  color: #fff; font-size: clamp(18px,3vw,22px); font-weight: 700;\n  letter-spacing: -0.02em; line-height: 1.2; margin: 0 0 6px;\n}\n.isbn-v-subtitle {\n  color: rgba(255,255,255,0.65); font-size: 13px; line-height: 1.5; margin: 0;\n  max-width: 420px;\n}\n.isbn-v-cta {\n  display: inline-flex; align-items: center; gap: 7px;\n  background: rgba(255,255,255,0.10); color: #fff;\n  font-family: var(--v-font); font-size: 11px; font-weight: 600;\n  padding: 8px 14px; border-radius: 20px; text-decoration: none;\n  border: 1px solid rgba(255,255,255,0.22); white-space: nowrap;\n  transition: var(--v-trans); flex-shrink: 0; position: relative; z-index: 1;\n}\n.isbn-v-cta:hover { background: rgba(255,255,255,0.20); color: #fff; text-decoration: none; }\n.isbn-v-cta-badge {\n  background: var(--v-amber); color: #000;\n  font-size: 9px; font-weight: 800; padding: 2px 6px; border-radius: 4px;\n}\n\n\/* \u2500\u2500 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\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-v-shell {\n  background: var(--v-white);\n  border-radius: 0 0 20px 20px;\n  box-shadow: var(--v-shadow-lg);\n  overflow: hidden;\n}\n\n\/* \u2500\u2500 SWITCH TO LOOKUP 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 *\/\n.isbn-v-switch-bar {\n  background: var(--v-blue-pale);\n  border-bottom: 1px solid var(--v-gray-200);\n  padding: 10px 28px;\n  display: flex; align-items: center; justify-content: space-between; gap: 8px;\n}\n.isbn-v-switch-bar span { font-size: 12px; color: var(--v-gray-600); }\n.isbn-v-switch-link {\n  display: inline-flex; align-items: center; gap: 6px;\n  font-size: 12px; font-weight: 600; color: var(--v-blue);\n  text-decoration: none; transition: var(--v-trans);\n}\n.isbn-v-switch-link:hover { color: var(--v-navy); text-decoration: none; }\n\n\/* \u2500\u2500 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\u2500\u2500\u2500\u2500\u2500 *\/\n.isbn-v-input-area { padding: 28px 28px 0; }\n.isbn-v-input-lbl {\n  display: block; font-size: 11px; font-weight: 700;\n  text-transform: uppercase; letter-spacing: 0.08em;\n  color: var(--v-gray-600); margin-bottom: 10px;\n}\n.isbn-v-input-row { display: flex; gap: 10px; align-items: stretch; }\n.isbn-v-input-wrap { flex: 1; position: relative; }\n.isbn-v-input-wrap .isbn-prefix {\n  position: absolute; left: 14px; top: 50%;\n  transform: translateY(-50%);\n  font-size: 12px; font-weight: 700; color: var(--v-gray-400);\n  pointer-events: none; font-family: var(--v-mono); letter-spacing: 0.05em;\n}\n#isbnVInput {\n  width: 100%; padding: 14px 14px 14px 58px;\n  border: 2px solid var(--v-gray-200); border-radius: var(--v-radius-sm);\n  font-size: 18px; font-family: var(--v-mono); font-weight: 500;\n  color: var(--v-gray-800); background: var(--v-white); outline: none;\n  transition: var(--v-trans); letter-spacing: 0.06em; -webkit-appearance: none;\n  box-sizing: border-box;\n}\n#isbnVInput::placeholder { color: var(--v-gray-300); font-size: 15px; letter-spacing: 0; font-family: var(--v-font); }\n#isbnVInput:focus { border-color: var(--v-blue-lt); box-shadow: 0 0 0 4px rgba(59,130,246,0.1); }\n#isbnVInput.v-valid   { border-color: #16a34a; background: #f0fdf4; }\n#isbnVInput.v-invalid { border-color: var(--v-red); background: var(--v-red-lt); }\n\n.isbn-v-btn {\n  padding: 14px 24px; background: var(--v-blue); color: #fff;\n  border: none; border-radius: var(--v-radius-sm);\n  font-size: 14px; font-weight: 700; font-family: var(--v-font);\n  cursor: pointer; transition: var(--v-trans); white-space: nowrap;\n  display: flex; align-items: center; gap: 8px; flex-shrink: 0;\n}\n.isbn-v-btn:hover  { background: #1a45c0; box-shadow: 0 4px 16px rgba(29,78,216,0.3); }\n.isbn-v-btn:active { transform: scale(0.98); }\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-v-result-area { padding: 16px 28px 0; }\n.isbn-v-toast {\n  border-radius: var(--v-radius-sm); padding: 16px 18px;\n  display: flex; align-items: flex-start; gap: 12px;\n  animation: vSlideIn 0.28s cubic-bezier(0.4,0,0.2,1);\n}\n@keyframes vSlideIn { from { opacity:0; transform:translateY(-6px); } to { opacity:1; transform:translateY(0); } }\n.isbn-v-toast.v-success { background: var(--v-green-lt); border: 1.5px solid var(--v-green-bd); }\n.isbn-v-toast.v-error   { background: var(--v-red-lt);   border: 1.5px solid var(--v-red-bd);   }\n.isbn-v-toast.v-info    { background: var(--v-blue-pale); border: 1.5px solid #bfdbfe;           }\n.v-toast-icon  { font-size: 22px; flex-shrink: 0; line-height: 1.3; }\n.v-toast-body  { flex: 1; }\n.v-toast-title { font-size: 14px; font-weight: 700; margin-bottom: 3px; }\n.v-toast-title.v-success { color: var(--v-green); }\n.v-toast-title.v-error   { color: var(--v-red);   }\n.v-toast-title.v-info    { color: var(--v-blue);   }\n.v-toast-sub { font-size: 12px; color: var(--v-gray-600); line-height: 1.5; }\n\n\/* \u2500\u2500 ISBN DISPLAY ROW \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\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-v-display-row {\n  margin-top: 10px;\n  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;\n}\n.isbn-v-number {\n  font-family: var(--v-mono); font-size: 17px; font-weight: 700;\n  color: var(--v-gray-800); letter-spacing: 0.07em;\n}\n.isbn-v-pill {\n  display: inline-flex; align-items: center; gap: 4px;\n  background: var(--v-white); border: 1px solid var(--v-gray-300);\n  color: var(--v-gray-600); font-size: 10px; font-weight: 600;\n  font-family: var(--v-font); padding: 3px 9px; border-radius: 10px;\n  cursor: pointer; transition: var(--v-trans);\n  text-transform: uppercase; letter-spacing: 0.05em;\n}\n.isbn-v-pill:hover { background: var(--v-gray-100); border-color: var(--v-gray-400); }\n.isbn-v-pill.copied { background: var(--v-green-lt); border-color: var(--v-green-bd); color: var(--v-green); }\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-v-section { padding: 20px 28px 0; }\n.isbn-v-sec-hd { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }\n.isbn-v-sec-title {\n  font-size: 10px; font-weight: 800; text-transform: uppercase;\n  letter-spacing: 0.1em; color: var(--v-blue); white-space: nowrap;\n}\n.isbn-v-sec-line { flex: 1; height: 1px; background: var(--v-gray-200); }\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-v-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }\n.isbn-v-card {\n  display: flex; align-items: center; gap: 12px;\n  padding: 14px 16px; border: 1.5px solid var(--v-gray-200);\n  border-radius: var(--v-radius-sm); background: var(--v-white);\n  cursor: pointer; transition: var(--v-trans); font-family: var(--v-font);\n  text-decoration: none;\n}\n.isbn-v-card:hover {\n  border-color: var(--v-blue-lt); background: var(--v-blue-pale);\n  transform: translateY(-1px); box-shadow: var(--v-shadow);\n  text-decoration: none;\n}\n.isbn-v-card-ico {\n  width: 38px; height: 38px; border-radius: 10px;\n  display: flex; align-items: center; justify-content: center;\n  font-size: 18px; flex-shrink: 0;\n}\n.ico-blue   { background: var(--v-blue-pale); }\n.ico-green  { background: var(--v-green-lt); }\n.ico-amber  { background: var(--v-amber-lt, #fffbeb); }\n.ico-slate  { background: var(--v-gray-100); }\n.isbn-v-card-lbl { font-size: 13px; font-weight: 700; color: var(--v-gray-800); line-height: 1.2; }\n.isbn-v-card-sub { font-size: 11px; color: var(--v-gray-400); margin-top: 2px; }\n\n\/* \u2500\u2500 LOOKUP UPSELL 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 *\/\n.isbn-v-lookup-banner {\n  display: flex; align-items: center; gap: 12px;\n  padding: 14px 18px;\n  background: linear-gradient(135deg, #0f172a 0%, #1e3a7a 100%);\n  border-radius: var(--v-radius-sm); cursor: pointer; border: none;\n  width: 100%; font-family: var(--v-font); text-align: left;\n  text-decoration: none; transition: var(--v-trans);\n}\n.isbn-v-lookup-banner:hover { filter: brightness(1.12); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(15,28,63,0.35); text-decoration: none; }\n.isbn-v-lookup-lbl { font-size: 14px; font-weight: 700; color: #fff; }\n.isbn-v-lookup-sub { font-size: 11px; color: rgba(255,255,255,0.6); margin-top: 1px; }\n\n\/* \u2500\u2500 ABOUT SECTION \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\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-v-about {\n  margin: 20px 28px 0;\n  background: var(--v-gray-50); border: 1px solid var(--v-gray-200);\n  border-radius: var(--v-radius); padding: 20px 22px;\n}\n.isbn-v-about h2 { font-size: 15px; font-weight: 700; color: var(--v-navy); margin: 0 0 10px; }\n.isbn-v-about p  { font-size: 13px; color: var(--v-gray-600); line-height: 1.7; margin: 0 0 10px; }\n.isbn-v-about p:last-child { margin: 0; }\n\n\/* \u2500\u2500 FOOTER PAD \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\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-v-pad { height: 28px; }\n\n\/* \u2500\u2500 RESPONSIVE \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\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: 600px) {\n  .isbn-v-header { padding: 20px 20px 18px; border-radius: 16px 16px 0 0; }\n  .isbn-v-header-inner { flex-direction: column; gap: 14px; }\n  .isbn-v-input-area, .isbn-v-result-area, .isbn-v-section { padding-left: 18px; padding-right: 18px; }\n  .isbn-v-input-row { flex-direction: column; }\n  .isbn-v-btn { width: 100%; justify-content: center; padding: 14px; }\n  .isbn-v-actions { grid-template-columns: 1fr; }\n  .isbn-v-about { margin-left: 18px; margin-right: 18px; }\n  .isbn-v-switch-bar { padding: 10px 18px; }\n}\n<\/style>\n\n<!-- MARKUP -->\n<div class=\"isbn-v-tool\">\n\n  <!-- Header -->\n  <div class=\"isbn-v-header\">\n    <div class=\"isbn-v-header-inner\">\n      <div>\n        <div class=\"isbn-v-badge\">\u2714 ISBN<\/div>\n        <h1 class=\"isbn-v-title\">ISBN Validator<\/h1>\n        <p class=\"isbn-v-subtitle\">Instantly verify whether any ISBN-10 or ISBN-13 is correctly formatted with a valid check digit.<\/p>\n      <\/div>\n      <a href=\"https:\/\/aceworldpgs.com\/acepublishingchecklist\" class=\"isbn-v-cta\" target=\"_blank\">\n        Download Publishing Checklist <span class=\"isbn-v-cta-badge\">\u2b07<\/span>\n      <\/a>\n    <\/div>\n  <\/div>\n\n  <div class=\"isbn-v-shell\">\n\n    <!-- Switch banner -->\n    <div class=\"isbn-v-switch-bar\">\n      <span><a href=\"https:\/\/aceworldpgs.com\/tools\/isbn-lookup\/\" class=\"isbn-v-switch-link\">\n        Lookup ISBN \u2192\n      <\/a><\/span>\n      <a href=\"https:\/\/aceworldpgs.com\/tools\/bulk-isbn-validator\/\" class=\"isbn-v-switch-link\">\n        Switch to Bulk mode \u2192\n      <\/a>\n    <\/div>\n\n    <!-- Input -->\n    <div class=\"isbn-v-input-area\">\n      <label class=\"isbn-v-input-lbl\" for=\"isbnVInput\">Enter ISBN-10 or ISBN-13<\/label>\n      <form onsubmit=\"isbnVValidate(); return false;\" class=\"isbn-v-input-row\">\n        <div class=\"isbn-v-input-wrap\">\n          <span class=\"isbn-prefix\">ISBN<\/span>\n          <input type=\"text\" id=\"isbnVInput\"\n                 placeholder=\"e.g. 9780747532743\"\n                 autocomplete=\"off\" autocorrect=\"off\"\n                 spellcheck=\"false\" inputmode=\"numeric\"\n                 maxlength=\"17\" required>\n        <\/div>\n        <button type=\"submit\" class=\"isbn-v-btn\" onclick=\"trackTool('isbn_validator')\">\n          \ud83d\udd0d Validate\n        <\/button>\n      <\/form>\n    <\/div>\n\n    <!-- Result toast -->\n    <div class=\"isbn-v-result-area\">\n      <div id=\"isbnVResultToast\"><\/div>\n    <\/div>\n\n    <!-- Actions (always visible, activated after valid result) -->\n    <div class=\"isbn-v-section\" id=\"isbnVActionsSection\">\n      <div class=\"isbn-v-sec-hd\">\n        <span class=\"isbn-v-sec-title\">Actions<\/span>\n        <span class=\"isbn-v-sec-line\"><\/span>\n      <\/div>\n\n      <div class=\"isbn-v-actions\" style=\"margin-bottom:10px;\">\n\n        <!-- Copy clean ISBN -->\n        <a class=\"isbn-v-card\" id=\"isbnVCopyCleanCard\" onclick=\"isbnVGuarded(isbnVCopyClean)\">\n          <div class=\"isbn-v-card-ico ico-blue\">\ud83d\udccb<\/div>\n          <div>\n            <div class=\"isbn-v-card-lbl\" id=\"isbnVCopyCleanLbl\">Copy Clean ISBN<\/div>\n            <div class=\"isbn-v-card-sub\">Digits only \u2014 no hyphens<\/div>\n          <\/div>\n        <\/a>\n\n        <!-- Copy hyphenated ISBN -->\n        <a class=\"isbn-v-card\" id=\"isbnVCopyHypCard\" onclick=\"isbnVGuarded(isbnVCopyHyphenated)\">\n          <div class=\"isbn-v-card-ico ico-slate\">\ud83d\udd20<\/div>\n          <div>\n            <div class=\"isbn-v-card-lbl\" id=\"isbnVCopyHypLbl\">Copy Hyphenated ISBN<\/div>\n            <div class=\"isbn-v-card-sub\">Formatted \u2014 e.g. 978-X-XXXXX-XXX-X<\/div>\n          <\/div>\n        <\/a>\n\n        <!-- Download barcode \u2014 href set dynamically after validation -->\n        <a class=\"isbn-v-card\"\n           id=\"isbnVBarcodeCard\"\n           href=\"https:\/\/aceworldpgs.com\/tools\/barcode-qr-code-generator\/\"\n           target=\"_blank\" rel=\"noopener noreferrer\"\n           onclick=\"trackTool('isbn_validator_barcode')\">\n          <div class=\"isbn-v-card-ico ico-amber\">\u2b07\ufe0f<\/div>\n          <div>\n            <div class=\"isbn-v-card-lbl\">Download Barcode<\/div>\n            <div class=\"isbn-v-card-sub\">Opens barcode generator with ISBN<\/div>\n          <\/div>\n        <\/a>\n\n        <!-- Bulk validator -->\n        <a class=\"isbn-v-card\"\n           href=\"https:\/\/aceworldpgs.com\/tools\/publishing-calculator\/\"\n           target=\"_blank\" rel=\"noopener noreferrer\">\n          <div class=\"isbn-v-card-ico ico-green\">\ud83d\udce6<\/div>\n          <div>\n            <div class=\"isbn-v-card-lbl\">Publish your Book<\/div>\n            <div class=\"isbn-v-card-sub\">Get instant publishing quotation<\/div>\n          <\/div>\n        <\/a>\n\n      <\/div>\n\n      <!-- ISBN Lookup upsell (full-width) -->\n      <a class=\"isbn-v-lookup-banner\"\n         id=\"isbnVLookupBanner\"\n         href=\"https:\/\/aceworldpgs.com\/tools\/isbn-lookup\/\"\n         target=\"_blank\" rel=\"noopener noreferrer\">\n        <span style=\"font-size:22px;\">\ud83d\udd0e<\/span>\n        <div>\n          <div class=\"isbn-v-lookup-lbl\">Look Up This ISBN<\/div>\n          <div class=\"isbn-v-lookup-sub\" id=\"isbnVLookupSub\">Validate first, then find this book across global databases<\/div>\n        <\/div>\n        <span style=\"margin-left:auto; font-size:16px; color:rgba(255,255,255,0.5);\">\u2192<\/span>\n      <\/a>\n    <\/div>\n\n    <!-- About the tool -->\n    <!--\n    <div class=\"isbn-v-about\">\n      <h2>About This Tool<\/h2>\n      <p>The <strong>ISBN Validator<\/strong> checks whether any ISBN-10 or ISBN-13 is structurally correct \u2014 verifying both the format and the check digit (the final digit, which is mathematically derived from all the others). A valid checksum does not guarantee the ISBN is <em>registered<\/em>; it only confirms the number is well-formed.<\/p>\n      <p>ISBN-10 numbers are automatically converted to their ISBN-13 equivalent (prefixed with <strong>978<\/strong>) for modern compatibility. The tool also identifies the likely origin region of the ISBN based on its registration group.<\/p>\n      <p>Need a verified ISBN for your new book? <a href=\"https:\/\/aceworldpgs.com\/tools\/publishing-calculator\/\" style=\"color:var(--v-blue);font-weight:600;\">Contact ACEworld Publishers \u2192<\/a><\/p>\n    <\/div>\n    -->\n\n    <div class=\"isbn-v-pad\"><\/div>\n\n  <\/div><!-- \/.isbn-v-shell -->\n<\/div><!-- \/.isbn-v-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    <style>\n        .ace-feedback-btn {\n            padding: 10px 14px;\n            background: #111827;\n            color: #fff;\n            border: none;\n            border-radius: 8px;\n            cursor: pointer;\n            font-size: 13px;\n            display: block;\n            margin: 20px auto;\n        }\n\n        .ace-feedback-modal {\n            display: none;\n            position: fixed;\n            top: 0; left: 0;\n            width: 100%; height: 100%;\n            background: rgba(0,0,0,0.5);\n            justify-content: center;\n            align-items: center;\n            z-index: 9999;\n        }\n\n        .ace-feedback-box {\n            background: #fff;\n            padding: 20px;\n            width: 100%;\n            max-width: 420px;\n            border-radius: 10px;\n        }\n\n        .ace-feedback-box textarea,\n        .ace-feedback-box input {\n            width: 100%;\n            margin-bottom: 10px;\n            padding: 10px;\n            border: 1px solid #ddd;\n            border-radius: 6px;\n        }\n\n        .ace-feedback-submit {\n            background: #2563eb;\n            color: #fff;\n            padding: 10px;\n            border: none;\n            width: 100%;\n            border-radius: 6px;\n            cursor: pointer;\n        }\n    <\/style>\n\n    <button class=\"ace-feedback-btn\" onclick=\"document.getElementById('aceFeedbackModal').style.display='flex'\">\n        Report Problem \/ Contact Us\n    <\/button>\n\n    <div id=\"aceFeedbackModal\" class=\"ace-feedback-modal\">\n        <div class=\"ace-feedback-box\">\n\n            <h3 style=\"margin-top:0;\">Send Feedback<\/h3>\n\n            <input type=\"email\" id=\"ace_feedback_email\" placeholder=\"Your email (optional)\">\n            <textarea id=\"ace_feedback_message\" rows=\"5\" placeholder=\"Describe your issue or suggestion...\"><\/textarea>\n\n            <button class=\"ace-feedback-submit\" onclick=\"trackTool('toolkit_feedback'); aceSendFeedback()\">\n                Send Message\n            <\/button>\n\n            <button style=\"margin-top:10px; background:#000; padding:8px; border:none; width:100%;\" \n                onclick=\"document.getElementById('aceFeedbackModal').style.display='none'\">\n                Close\n            <\/button>\n\n        <\/div>\n    <\/div>\n\n    <script>\n    function aceSendFeedback() {\n\n        let email = document.getElementById('ace_feedback_email').value;\n        let message = document.getElementById('ace_feedback_message').value;\n\n        fetch('https:\/\/aceworldpgs.com\/tools\/wp-admin\/admin-ajax.php', {\n            method: 'POST',\n            headers: {'Content-Type': 'application\/x-www-form-urlencoded'},\n            body: new URLSearchParams({\n                action: 'ace_send_feedback',\n                email: email,\n                message: message,\n                post_url: 'https:\/\/aceworldpgs.com\/tools\/isbn-validator\/',\n                post_title: 'ISBN Validator'\n            })\n        }).then(res => res.json()).then(res => {\n            alert('Thank you! Your feedback has been sent.');\n            document.getElementById('aceFeedbackModal').style.display='none';\n        });\n\n    }\n    <\/script>\n\n    \n<script>\n(function () {\n  'use strict';\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\u2500\n  let currentClean = '';\n  let currentHyphenated = '';\n\n  \/\/ \u2500\u2500 Derive hyphenated display: 978-X-XXXXX-XXX-X \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n  function buildHyphenated(isbn13) {\n    return isbn13.substring(0,3) + '-' +\n           isbn13[3] + '-' +\n           isbn13.substring(4,9) + '-' +\n           isbn13.substring(9,12) + '-' +\n           isbn13[12];\n  }\n\n  \/\/ \u2500\u2500 Guard: require valid ISBN before acting \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n  function isbnVGuarded(fn) {\n    if (!currentClean) {\n      showToast('v-error', '\u26a0\ufe0f', 'No ISBN validated yet', 'Enter and validate an ISBN first, then use the actions below.');\n      document.getElementById('isbnVInput').focus();\n      return;\n    }\n    fn();\n  }\n\n  \/\/ \u2500\u2500 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\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n  function showToast(type, icon, title, body) {\n    const el = document.getElementById('isbnVResultToast');\n    if (!el) return;\n    el.innerHTML = `\n      <div class=\"isbn-v-toast ${type}\">\n        <span class=\"v-toast-icon\">${icon}<\/span>\n        <div class=\"v-toast-body\">\n          <div class=\"v-toast-title ${type}\">${title}<\/div>\n          ${body ? '<div class=\"v-toast-sub\">' + body + '<\/div>' : ''}\n          <div class=\"isbn-v-display-row\" id=\"isbnVDisplayRow\"><\/div>\n        <\/div>\n      <\/div>`;\n  }\n\n  \/\/ \u2500\u2500 Main validation \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n  function isbnVValidate() {\n    let raw = (document.getElementById('isbnVInput').value || '').replace(\/-\/g,'').trim();\n    const inputEl = document.getElementById('isbnVInput');\n\n    \/\/ Reset\n    currentClean = '';\n    currentHyphenated = '';\n    inputEl.className = '';\n    document.getElementById('isbnVResultToast').innerHTML = '';\n    resetBarcodeLink();\n    resetLookupBanner();\n\n    \/\/ \u2500\u2500 ISBN-10 \u2192 ISBN-13 conversion \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n    if (raw.length === 10 && \/^\\d{9}[\\dXx]$\/.test(raw)) {\n      \/\/ Validate ISBN-10 check digit first\n      let sum10 = 0;\n      for (let i = 0; i < 9; i++) sum10 += parseInt(raw[i]) * (10 - i);\n      const checkChar = raw[9].toUpperCase();\n      const check10Val = checkChar === 'X' ? 10 : parseInt(checkChar);\n      const expected10 = 11 - (sum10 % 11);\n      const normalised10 = expected10 === 11 ? 0 : (expected10 === 10 ? 10 : expected10);\n\n      if (normalised10 !== check10Val) {\n        inputEl.classList.add('v-invalid');\n        showToast('v-error', '\u2717', 'Invalid ISBN-10 check digit',\n          'The check digit of this 10-digit ISBN is incorrect. Please verify the number.');\n        return;\n      }\n\n      const temp = '978' + raw.substring(0, 9);\n      let sum13 = 0;\n      for (let i = 0; i < 12; i++) sum13 += (i % 2 === 0) ? parseInt(temp[i]) : parseInt(temp[i]) * 3;\n      const check13 = (10 - (sum13 % 10)) % 10;\n      raw = temp + check13;\n\n      showToast('v-info', '\u2139\ufe0f', 'ISBN-10 detected \u2014 converted to ISBN-13',\n        'This 10-digit ISBN is valid and has been converted to ISBN-13 for you.');\n      setTimeout(renderSuccess, 10); \/\/ let toast render first\n    }\n\n    if (raw.length !== 13 || !\/^\\d{13}$\/.test(raw)) {\n      inputEl.classList.add('v-invalid');\n      showToast('v-error', '\u2717', 'Invalid format',\n        'Please enter a valid 10 or 13-digit ISBN. Hyphens are allowed.');\n      return;\n    }\n\n    \/\/ \u2500\u2500 ISBN-13 checksum \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\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    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('v-invalid');\n      showToast('v-error', '\u2717', 'Invalid check digit',\n        'The final digit of <strong style=\"font-family:monospace\">' + raw + '<\/strong> is incorrect. ' +\n        'Expected <strong>' + expected + '<\/strong> \u2014 check for typos.');\n      return;\n    }\n\n    renderSuccess();\n\n    function renderSuccess() {\n      const hyphenated = buildHyphenated(raw);\n      const origin     = detectOrigin(raw);\n\n      currentClean      = raw;\n      currentHyphenated = hyphenated;\n      inputEl.classList.add('v-valid');\n\n      \/\/ Overwrite toast with success (handles both direct-13 and converted-10 paths)\n      const el = document.getElementById('isbnVResultToast');\n      if (el) {\n        el.innerHTML = `\n          <div class=\"isbn-v-toast v-success\">\n            <span class=\"v-toast-icon\">\u2713<\/span>\n            <div class=\"v-toast-body\">\n              <div class=\"v-toast-title v-success\">Valid ${origin} ISBN-13<\/div>\n              <div class=\"v-toast-sub\">Checksum verified. This ISBN is correctly formatted.<\/div>\n              <div class=\"isbn-v-display-row\">\n                <span class=\"isbn-v-number\">${hyphenated}<\/span>\n                <button class=\"isbn-v-pill\" id=\"vPillClean\"   onclick=\"isbnVCopyClean()\">\ud83d\udccb Copy Clean<\/button>\n                <button class=\"isbn-v-pill\" id=\"vPillHyp\"     onclick=\"isbnVCopyHyphenated()\">\ud83d\udd20 Copy Hyphenated<\/button>\n              <\/div>\n            <\/div>\n          <\/div>`;\n      }\n\n      \/\/ Update barcode card link\n      updateBarcodeLink(raw);\n      \/\/ Update lookup banner link\n      updateLookupBanner(raw, hyphenated);\n    }\n  }\n\n  \/\/ \u2500\u2500 Detect origin from registration group \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n  function detectOrigin(isbn13) {\n    if (isbn13.startsWith('978978')) return 'Nigerian';\n    const core = isbn13.substring(3);\n    if (core.startsWith('0') || core.startsWith('1')) return 'English-language';\n    if (core.startsWith('2')) return 'French-language';\n    if (core.startsWith('3')) return 'German-language';\n    if (core.startsWith('4')) return 'Japanese';\n    if (core.startsWith('7')) return 'Chinese';\n    return 'International';\n  }\n\n  \/\/ \u2500\u2500 Copy helpers \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\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  function isbnVCopyClean() {\n    if (!currentClean) return;\n    navigator.clipboard.writeText(currentClean).then(() => {\n      flashPill('vPillClean', '\u2713 Copied!');\n    });\n  }\n\n  function isbnVCopyHyphenated() {\n    if (!currentHyphenated) return;\n    navigator.clipboard.writeText(currentHyphenated).then(() => {\n      flashPill('vPillHyp', '\u2713 Copied!');\n    });\n  }\n\n  function flashPill(id, msg) {\n    const btn = document.getElementById(id);\n    if (!btn) return;\n    const orig = btn.textContent;\n    btn.textContent = msg;\n    btn.classList.add('copied');\n    setTimeout(() => { btn.textContent = orig; btn.classList.remove('copied'); }, 2000);\n  }\n\n  \/\/ \u2500\u2500 Barcode card: update href with isbn query param \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n  function updateBarcodeLink(isbn) {\n    const card = document.getElementById('isbnVBarcodeCard');\n    if (card) {\n      card.href = 'https:\/\/aceworldpgs.com\/tools\/barcode-qr-code-generator\/?isbn=' + encodeURIComponent(isbn);\n    }\n  }\n\n  function resetBarcodeLink() {\n    const card = document.getElementById('isbnVBarcodeCard');\n    if (card) card.href = 'https:\/\/aceworldpgs.com\/tools\/barcode-qr-code-generator\/';\n  }\n\n  \/\/ \u2500\u2500 Lookup banner: update with validated ISBN \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n  function updateLookupBanner(isbn, hyphenated) {\n    const banner = document.getElementById('isbnVLookupBanner');\n    const sub    = document.getElementById('isbnVLookupSub');\n    if (banner) banner.href = 'https:\/\/aceworldpgs.com\/tools\/isbn-lookup\/?isbn=' + encodeURIComponent(isbn);\n    if (sub)    sub.textContent = 'Search databases for ' + hyphenated;\n  }\n\n  function resetLookupBanner() {\n    const banner = document.getElementById('isbnVLookupBanner');\n    const sub    = document.getElementById('isbnVLookupSub');\n    if (banner) banner.href = 'https:\/\/aceworldpgs.com\/tools\/isbn-lookup\/';\n    if (sub)    sub.textContent = 'Validate first, then find this book across global databases';\n  }\n\n  \/\/ \u2500\u2500 Expose globals \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\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  window.isbnVValidate       = isbnVValidate;\n  window.isbnVGuarded        = isbnVGuarded;\n  window.isbnVCopyClean      = isbnVCopyClean;\n  window.isbnVCopyHyphenated = isbnVCopyHyphenated;\n\n  \/\/ \u2500\u2500 Auto-fill from URL param (?isbn=...) \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n  document.addEventListener('DOMContentLoaded', function () {\n    const params = new URLSearchParams(window.location.search);\n    const preIsbn = params.get('isbn');\n    if (preIsbn) {\n      const inp = document.getElementById('isbnVInput');\n      if (inp) {\n        inp.value = preIsbn;\n        isbnVValidate();\n      }\n    }\n  });\n\n})();\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}]}}