{"id":4551,"date":"2026-03-13T00:27:22","date_gmt":"2026-03-13T00:27:22","guid":{"rendered":"https:\/\/aceworldpgs.com\/?page_id=4551"},"modified":"2026-03-14T19:18:52","modified_gmt":"2026-03-14T19:18:52","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\"><div class='code-block code-block-25' style='margin: 8px 0; clear: both;'>\n<style>\n    :root { \n        --primary: #007bff; --success: #28a745; --google: #4285F4; \n        --whatsapp: #25D366; --twitter: #000000; --dark: #333; \n        --light: #f8f9fa; --border: #ddd;\n    }\n\n    * { box-sizing: border-box; }\n\n    .card { \n        background: white; border-radius: 16px; padding: 25px; \n        box-shadow: 0 10px 30px rgba(0,0,0,0.05); max-width: 900px; margin: 0 auto;\n    }\n\n    .global-badge {\n        background: #eef2ff; color: black; padding: 8px 15px; border-radius: 50px;\n        font-size: 13px; font-weight: bold; display: inline-block; margin-bottom: 15px;\n        border: 1px solid #c7d2fe; text-align: center; width: 100%;\n    }\n\n    .input-group { display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }\n    input[type=\"text\"] { \n        width: 100%; padding: 16px; border: 2px solid var(--border); \n        border-radius: 10px; font-size: 18px; outline: none; -webkit-appearance: none;\n    }\n    .btn-main { \n        background: var(--primary); color: white; padding: 16px; font-size: 18px; \n        border: none; border-radius: 10px; font-weight: 600; cursor: pointer; transition: 0.2s;\n    }\n    .btn-main:hover { background: #000000; }\n\n    .verify-grid { display: flex; flex-direction: column; gap: 10px; margin-top: 20px; }\n    button { \n        cursor: pointer; border: none; border-radius: 10px; font-weight: 600; \n        min-height: 54px; width: 100%; display: flex; align-items: center; \n        justify-content: center; transition: 0.2s; \n    }\n    .verify-grid button { background: var(--light); border: 1px solid var(--border); color: #444; font-size: 15px; }\n\n    .barcode-btn { background: black !important; color: white !important; order: 6; }\n    .google-btn { background: white !important; color: black !important; border: 1px solid #ccc !important;}\n    .amazon-btn { background: #017047 !important; color: white !important; }\n    .nln-btn { background: #017047 !important; color: white !important; }\n\n    .book-preview { \n        display: flex; flex-direction: column; align-items: center; gap: 15px; \n        background: #fffdf0; border: 1px solid #ffe58f; padding: 20px; \n        border-radius: 12px; margin-top: 15px; text-align: center;\n        animation: fadeIn 0.4s ease-out;\n    }\n    @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }\n    .book-preview img { width: 95px; border-radius: 4px; box-shadow: 0 4px 8px rgba(0,0,0,0.1); }\n\n    .section-title { font-weight: bold; font-size: 14px; color: #555; margin-bottom: 10px; display: block; text-align: center; }\n    .link-list { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-bottom: 20px; }\n    .link-item { \n        cursor: pointer; color: #444; background: #f0f0f0; \n        padding: 6px 14px; border-radius: 20px; font-size: 12px; \n        transition: 0.2s; border: 1px solid #ddd;\n    }\n    .link-item:hover { background: #e0e0e0; border-color: #bbb; }\n\n    .link-item.checked {\n        background: #e6fffa !important;\n        border-color: #38a169 !important;\n        color: #2f855a !important;\n    }\n    .link-item.checked::after { content: \" \u2713\"; font-weight: bold; }\n\n    .accordion-btn {\n        width: auto; \n        min-width: 200px; \n        margin: 15px auto; \n        background: #f0f0f0; \n        border: 1px solid #ddd;\n        padding: 8px 20px;\n        border-radius: 25px; \n        font-weight: 600; \n        color: #666;\n        cursor: pointer; \n        display: flex; \n        justify-content: center; \n        align-items: center;\n        gap: 10px;\n        font-size: 13px; \n        transition: 0.3s;\n    }\n\n    .accordion-btn:hover {\n        background: #333;\n        color: white;\n        border-color: #000;\n    }\n    .accordion-content { \n        max-height: 0; overflow: hidden; transition: max-height 0.4s ease-out; \n    }\n    .accordion-content.open { max-height: 1200px; padding: 15px 0; }\n\n    .share-section { margin-top: 30px; padding: 20px 10px; border-top: 1px solid #eee; text-align: center; }\n    .share-btns { display: flex; justify-content: center; gap: 15px; margin-top: 12px; }\n    .share-icon { \n        width: 44px; height: 44px; border-radius: 50%; display: flex; \n        align-items: center; justify-content: center; color: white; \n        text-decoration: none; font-size: 20px; transition: 0.3s; \n    }\n    .wa { background: var(--whatsapp); } .tw { background: var(--twitter); } .li { background: #0077b5; }\n\n    @media (min-width: 550px) {\n        .input-group { flex-direction: row; }\n        input[type=\"text\"] { flex: 3; }\n        .btn-main { flex: 1; }\n        .verify-grid { display: grid; grid-template-columns: 1fr 1fr; }\n        .barcode-btn, .copy-btn { grid-column: span 2; }\n        .book-preview { flex-direction: row; text-align: left; }\n    }\n<\/style>\n\n<div class=\"card\">\n\n<!--\n<div id=\"globalCounterDisplay\" class=\"global-badge\">More about the ISBN Validaor? <a href=\"javascript:void(0)\" onclick=\"loadTool(event, 'how-it-works'); document.getElementById('isbnhow').scrollIntoView({behavior:'smooth'});\">Click here<\/a><\/div>\n-->\n\n<div style=\"text-align: right; margin-bottom: 15px;\">\n    <a href=\"https:\/\/aceworldpgs.com\/acepublishingchecklist\"  style=\"text-decoration:none; font-size:12px; font-weight:bold; color:#007bff; display:inline-flex; align-items:center; gap:5px;\">\n        <span>Download Publishing Checklist <\/span> \n        <span style=\"background:#ffd700; color:#000; padding:2px 6px; border-radius:4px; font-size:10px;\"> \u2b07\ufe0f<\/span>\n    <\/a>\n<\/div>\n\n<div style=\"text-align: right; margin-bottom: 15px;\">\n    <a href=\"https:\/\/aceworldpgs.com\/tools\/bulk-isbn-validator\/\" style=\"text-decoration:none; font-size:12px; font-weight:bold; color:#007bff; display:inline-flex; align-items:center; gap:5px;\">\n        <span>Switch to Bulk Mode <\/span> \n        <span style=\"background:#ffd700; color:#000; padding:2px 6px; border-radius:4px; font-size:10px;\">PRO<\/span>\n    <\/a>\n<\/div>\n\n    <form onsubmit=\"processISBN(); return false;\" class=\"input-group\">\n        <input type=\"text\" id=\"isbnInput\" placeholder=\"Enter ISBN...\" required>\n        <button onclick=\"trackTool('isbn_validator')\" class=\"btn-main\" type=\"submit\">Validate<\/button>\n    <\/form>\n\n    <div id=\"result\"><\/div>\n    <div id=\"bookDetails\"><\/div>\n\n    <div style=\"margin-top: 30px;\">\n        <span class=\"section-title\">Search Literary Databases:<\/span>\n        <div class=\"link-list\" id=\"majorStoreList\"><\/div>\n        \n        <button class=\"accordion-btn\" onclick=\"toggleAccordion()\">\n            <span style=\"text-align: center;\">Show More Platforms<\/span>\n            <span id=\"acc-icon\">\u25bc<\/span>\n        <\/button>\n        <div id=\"extendedAccordion\" class=\"accordion-content\">\n            <div class=\"link-list\" id=\"extendedStoreList\"><\/div>\n        <\/div>\n    <\/div>\n    <br>\n    <div style='background:#f0fff4; border:1px solid #c6f6d5; display:block; padding:12px; border-radius:8px; margin-bottom:10px;'>\n        <small style=\"color:#555; text-align:center; display:block; margin-top:10px;\">\n    Want your books on these bookstores? \n    <a href=\"https:\/\/aceworldpgs.com\/tools\/publishing-calculator\/\" style=\"text-decoration:none; color:#007cba; font-weight:bold;\">Get Quotation<\/a>.\n<\/small>\n    <\/div>\n    <div>\n        <button onclick=\"trackTool('NLN_verifier'); checkAndRun(searchNLN)\" class=\"nln-btn\">\n    Check National Library\n<\/button>\n        \n        <!--\n        <button onclick=\"copyToClipboard(event)\" class=\"google-btn\"><span class=\"btn-text\">Copy Clean ISBN<\/span><\/button>\n        <button onclick=\"copyFormattedISBN(event)\" class=\"google-btn\"> <span class=\"btn-text\">Copy Formatted ISBN<\/span><\/button>\n        -->\n        <br>\n         <small style=\"color:#555; text-align:center; display:block; margin-top:10px;\">Need an instant barcode for this ISBN? <a href=\"https:\/\/aceworldpgs.com\/tools\/barcode-qr-code-generator\/\" style=\"text-decoration:none;\"><strong>Download Barcode<\/strong><\/a>.<\/small>\n    <\/div>\n<!--\n    <div class=\"share-section\">\n        <div style=\"font-size: 14px; font-weight: bold; color: #555;\">Enjoyed using this? Share with others!<\/div>\n        <div class=\"share-btns\">\n            <a href=\"#\" id=\"shareWA\" target=\"_blank\" class=\"share-icon wa\">W<\/a>\n            <a href=\"#\" id=\"shareTW\" target=\"_blank\" class=\"share-icon tw\">X<\/a>\n            <a href=\"#\" id=\"shareLI\" target=\"_blank\" class=\"share-icon li\">in<\/a>\n        <\/div>\n    <\/div>\n-->\n\n    <div style=\"margin-top: 20px;\">\n        <span class=\"section-title\">Recent Searches:<\/span>\n        <div class=\"link-list\" id=\"historyList\"><\/div>\n    <\/div>\n    \n    <br>\n    <div class=\"global-badge\">Need a valid ISBN? <a href=\"https:\/\/aceworldpgs.com\/tools\/publishing-calculator\/\" target=\"_blank\">Contact us!<\/a><\/div>\n\n<\/div>\n\n<div class='code-block code-block-39' style='margin: 8px auto; text-align: center; display: block; clear: both;'>\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><\/div>\n\n\n<div class='code-block code-block-40' style='margin: 8px 0; clear: both;'>\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\/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><\/div>\n\n\n<script>\nlet currentValidIsbn = \"\";\nconst TOOL_URL = window.location.href; \n\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: \"Angus & Robertson\", url: \"https:\/\/www.angusrobertson.com.au\/books\/search?q=\" },\n   \/\/ { name: \"Hachette\", url: \"https:\/\/www.hachettebookgroup.com\/?s=\" },\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: \"Ingram\", url: \"https:\/\/www.google.com\/search?q=Ingram+\" },\n   \/\/ { name: \"Bowker\", url: \"https:\/\/www.myidentifiers.com\/search\/node\/\" },\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: \"Beam\", url: \"https:\/\/www.google.com\/search?q=site:beam.land+\" },\n   \/\/ { name: \"Bookpeddler\", url: \"https:\/\/www.bookpeddler.com\/shop\/search?keyword=\" },\n   \/\/ { name: \"Morawa\", url: \"https:\/\/www.morawa.at\/suche?q=\" },\n   \/\/ { name: \"BBIP (Global\/Nielsen)\", url: \"https:\/\/www.google.com\/search?q=Nielsen+BBIP+\" },\n    { name: \"Libristo (EU)\", url: \"https:\/\/www.libristo.eu\/en\/search?q=\" },\n   \/\/  { name: \"DangDang (CN)\", url: \"http:\/\/search.dangdang.com\/?key=\" },\n    { name: \"World of Books\", url: \"https:\/\/www.worldofbooks.com\/de-ch\/search?q=\" },\n   \/\/ { name: \"Elsevier\", url: \"https:\/\/shop.elsevier.com\/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\nfunction checkAndRun(actionFunction) {\n    if (!currentValidIsbn) {\n        const resultEl = document.getElementById(\"result\");\n        resultEl.innerHTML = \"<span style='color:#d93025; background:#fff0f0; border:1px solid #ffcccb; display:block; padding:12px; border-radius:8px; margin-bottom:10px;'>Please enter and <strong>Validate<\/strong> an ISBN first.<\/span>\";\n        window.scrollTo({ top: 0, behavior: 'smooth' });\n        return;\n    }\n    actionFunction();\n}\n\nfunction handleStoreClick(id, url) {\n    checkAndRun(() => {\n        const btn = document.getElementById(`btn-${id}`);\n        const storeName = btn ? btn.textContent : \"Unknown Store\"; \n        window.open(url + currentValidIsbn, '_blank');\n        \n        if(btn) btn.classList.add('checked');\n\n        \/\/ Log the click to WordPress\n        logStoreClickToWordPress(currentValidIsbn, storeName);\n    });\n}\n\nasync function logStoreClickToWordPress(isbn, storeName) {\n    const fd = new FormData();\n    fd.append('action', 'save_isbn_usage');\n    fd.append('isbn', isbn);\n    fd.append('clicked_store', storeName); \n    fd.append('is_click_event', '1');      \n\n    fetch('\/wp-admin\/admin-ajax.php', { method: 'POST', body: fd });\n}\n\nfunction toggleAccordion() {\n    const content = document.getElementById(\"extendedAccordion\");\n    const icon = document.getElementById(\"acc-icon\");\n    if(!content || !icon) return;\n    content.classList.toggle(\"open\");\n    icon.innerHTML = content.classList.contains(\"open\") ? \"\u25b2\" : \"\u25bc\";\n}\n\nfunction populateStores() {\n    const mapper = (s) => {\n        const id = s.name.replace(\/[^a-zA-Z]\/g, '');\n        return `<span id=\"btn-${id}\" class=\"link-item\" onclick=\"handleStoreClick('${id}', '${s.url}')\">${s.name}<\/span>`;\n    };\n    const majorEl = document.getElementById(\"majorStoreList\");\n    const extEl = document.getElementById(\"extendedStoreList\");\n    if(majorEl) majorEl.innerHTML = majorStores.map(mapper).join(\"\");\n    if(extEl) extEl.innerHTML = extendedStores.map(mapper).join(\"\");\n}\n\nasync function processISBN() {\n    let input = document.getElementById(\"isbnInput\").value;\n    let isbn = input.replace(\/-\/g, \"\").trim();\n    const resultEl = document.getElementById(\"result\");\n    const bookEl = document.getElementById(\"bookDetails\");\n    \n    document.querySelectorAll('.link-item').forEach(el => el.classList.remove('checked'));\n    bookEl.innerHTML = \"\";\n    currentValidIsbn = \"\";\n\n    \/\/ ISBN-10 to ISBN-13 Conversion\n    if (isbn.length === 10) {\n        let tempIsbn = \"978\" + isbn.substring(0, 9);\n        let sum = 0;\n        for (let i = 0; i < 12; i++) sum += (i % 2 === 0) ? parseInt(tempIsbn[i]) : parseInt(tempIsbn[i]) * 3;\n        let checkDigit = (10 - (sum % 10)) % 10;\n        isbn = tempIsbn + checkDigit;\n        resultEl.innerHTML = `<span style='color:var(--primary); display:block; padding:10px;'>10-digit detected. Converted: <strong>${isbn}<\/strong><\/span>`;\n    }\n\n    if (isbn.length !== 13 || !\/^\\d+$\/.test(isbn)) {\n        resultEl.innerHTML = \"<span style='color:#d93025; display:block; padding:10px;'>Please enter a valid 10 or 13-digit ISBN.<\/span>\";\n        return;\n    }\n\n    \/\/ Checksum Validation\n    let sum = 0;\n    for (let i = 0; i < 12; i++) sum += (i % 2 === 0) ? parseInt(isbn[i]) : parseInt(isbn[i]) * 3;\n    const checkDigit = (10 - (sum % 10)) % 10;\n\n    if (checkDigit === parseInt(isbn[12])) {\n        let countryName = \"International\";\n        if (isbn.startsWith('978978')) countryName = \"Nigerian\";\n        else {\n            const core = isbn.substring(3);\n            if (core.startsWith('0') || core.startsWith('1')) countryName = \"English (USA\/UK)\";\n            else if (core.startsWith('2')) countryName = \"French\";\n            else if (core.startsWith('3')) countryName = \"German\";\n            else if (core.startsWith('4')) countryName = \"Japanese\";\n        }\n\n        resultEl.innerHTML = `\n            <div style='color:var(--success); background:#f0fff4; border:1px solid #c6f6d5; display:block; padding:12px; border-radius:8px; margin-bottom:10px;'>\n                ISBN <strong>${isbn}<\/strong> is a valid <strong>${countryName}<\/strong> ISBN. <br>\n                <small style=\"color:#555;\">Click a platform to check if number has been used:<\/small>\n            <\/div>`;\n        \n        currentValidIsbn = isbn;\n        logUsageToWordPress(isbn, countryName); \n        fetchGoogleMetadata(isbn);\n        saveToHistory(isbn);\n    } else {\n        resultEl.innerHTML = `<span style='color:#d93025; background:#fff5f5; border:1px solid #feb2b2; display:block; padding:12px; border-radius:8px;'>Invalid Checksum for ${isbn}.<\/span>`;\n    }\n}\n\nasync function logUsageToWordPress(isbn, isbnCountry) { \n    let geo = { country: \"Unknown\", city: \"Unknown\" };\n    try {\n        const res = await fetch('https:\/\/ipapi.co\/json\/');\n        const data = await res.json();\n        geo.country = data.country_name || \"Unknown\";\n        geo.city = data.city || \"Unknown\";\n    } catch (e) { console.warn(\"Geo-logging failed.\"); }\n\n    const fd = new FormData();\n    fd.append('action', 'save_isbn_usage');\n    fd.append('isbn', isbn);\n    fd.append('isbn_origin', isbnCountry); \/\/ Removed the 'isBulk' error\n    fd.append('country', geo.country);\n    fd.append('city', geo.city);\n\n    fetch('\/wp-admin\/admin-ajax.php', { method: 'POST', body: fd });\n}\n\nfunction toggleAccordion() {\n    const content = document.getElementById(\"extendedAccordion\");\n    const icon = document.getElementById(\"acc-icon\");\n    content.classList.toggle(\"open\");\n    icon.innerHTML = content.classList.contains(\"open\") ? \"\u25b2\" : \"\u25bc\";\n}\n\n\nasync function fetchGoogleMetadata(isbn) {\n    const bookEl = document.getElementById(\"bookDetails\");\n    \n    \/\/ Step 1: Try Google Books API\n    try {\n        const response = await fetch(`https:\/\/www.googleapis.com\/books\/v1\/volumes?q=isbn:${isbn}`);\n        const data = await response.json();\n        \n        if (data.totalItems > 0) {\n            const info = data.items[0].volumeInfo;\n            const thumb = info.imageLinks?.thumbnail || 'https:\/\/via.placeholder.com\/90x120?text=No+Cover';\n            \n            bookEl.innerHTML = `\n                <div class=\"book-preview\">\n                    <img decoding=\"async\" src=\"${thumb}\">\n                    <div>\n                        <div style=\"font-weight:bold;\">${info.title}<\/div>\n                        <div style=\"color:#666; font-size:14px;\">${info.authors?.join(\", \") || \"Unknown\"}<\/div>\n                        <div style=\"color:#aaa; font-size:12px; margin-top:8px; font-style:italic;\">Source: Google Books<\/div>\n                    <\/div>\n                <\/div>`;\n            return; \n        }\n    } catch (e) { console.warn(\"Google API Error, trying fallback...\"); }\n\n    \/\/ Step 2: Fallback to Open Library\n    try {\n        const olResponse = await fetch(`https:\/\/openlibrary.org\/api\/books?bibkeys=ISBN:${isbn}&format=json&jscmd=data`);\n        const olData = await olResponse.json();\n        const key = `ISBN:${isbn}`;\n        \n        if (olData && olData[key]) {\n            const info = olData[key];\n            const thumb = info.cover?.medium || info.cover?.small || 'https:\/\/via.placeholder.com\/90x120?text=No+Cover';\n            const authors = info.authors ? info.authors.map(a => a.name).join(\", \") : \"Unknown\";\n            \n            bookEl.innerHTML = `\n                <div class=\"book-preview\">\n                    <img decoding=\"async\" src=\"${thumb}\">\n                    <div>\n                        <div style=\"font-weight:bold;\">${info.title}<\/div>\n                        <div style=\"color:#666; font-size:14px;\">${authors}<\/div>\n                        <div style=\"color:#aaa; font-size:12px; margin-top:8px; font-style:italic;\">Source: Open Library (Internet Archive)<\/div>\n                    <\/div>\n                <\/div>`;\n        }\n    } catch (e) { console.error(\"Open Library API Error:\", e); }\n}\n\n\nfunction updateShareLinks() {\n    \/\/ Message is strictly predefined as requested\n    const message = \"I just validated my ISBN with this professional tool! Check it out:\";\n    const encodedMsg = encodeURIComponent(message + \" \" + TOOL_URL);\n    document.getElementById(\"shareWA\").href = `https:\/\/api.whatsapp.com\/send?text=${encodedMsg}`;\n    document.getElementById(\"shareTW\").href = `https:\/\/twitter.com\/intent\/tweet?text=${encodedMsg}`;\n    document.getElementById(\"shareLI\").href = `https:\/\/www.linkedin.com\/sharing\/share-offsite\/?url=${encodeURIComponent(TOOL_URL)}`;\n}\n\nfunction searchNLN() { window.open(`https:\/\/isbn.nln.gov.ng\/search\/index.php?search=${currentValidIsbn}&search_submit=`, \"_blank\"); }\nfunction generateBarcode() { window.open(`https:\/\/barcode.tec-it.com\/barcode.ashx?data=${currentValidIsbn}&code=ISBN13&download=true`, \"_blank\"); }\n\nfunction copyToClipboard(e) {\n  if (!currentValidIsbn) return;\n  const btn = e.currentTarget;\n  const textSpan = btn.querySelector(\".btn-text\");\n  const originalText = textSpan.textContent;\n  navigator.clipboard.writeText(currentValidIsbn).then(() => {\n    textSpan.textContent = \"Copied!\";\n    setTimeout(() => { textSpan.textContent = originalText; }, 2000);\n  });\n}\n\n\nfunction saveToHistory(isbn) {\n    let history = JSON.parse(localStorage.getItem(\"isbnHistory\") || \"[]\");\n    if (!history.includes(isbn)) {\n        history.unshift(isbn);\n        localStorage.setItem(\"isbnHistory\", JSON.stringify(history.slice(0, 5)));\n    }\n    renderHistory();\n}\n\nfunction renderHistory() {\n    const history = JSON.parse(localStorage.getItem(\"isbnHistory\") || \"[]\");\n    document.getElementById(\"historyList\").innerHTML = history.map(num => `<span class=\"link-item\" onclick=\"loadHistory('${num}')\">${num}<\/span>`).join(\"\");\n}\n\nfunction loadHistory(num) {\n    document.getElementById(\"isbnInput\").value = num;\n    processISBN();\n}\n\n\/\/ This function was missing from your script!\nasync function logUsageToWordPress(isbn, isbnCountry) { \n    let geo = { country: \"Unknown\", city: \"Unknown\" };\n    try {\n        \/\/ We fetch the user's location first\n        const res = await fetch('https:\/\/ipapi.co\/json\/');\n        const data = await res.json();\n        if(data.country_name) {\n            geo.country = data.country_name;\n            geo.city = data.city || \"Unknown\";\n        }\n    } catch (e) { \n        console.warn(\"Geo-logging failed, proceeding with Unknown location.\"); \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\n    \/\/ Send to your WordPress PHP handler\n    fetch('\/wp-admin\/admin-ajax.php', { method: 'POST', body: fd })\n    .then(response => response.json())\n    .then(data => console.log('Log Success:', data))\n    .catch(error => console.error('Log Error:', error));\n}\n\npopulateStores();\nrenderHistory();\nupdateShareLinks();\n<\/script><\/div>\n<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-left\">About ISBN Validator<\/h2>\n\n\n\n<p class=\"has-text-align-left\">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>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\">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\">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\"><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\">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\"><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=\"has-text-align-left\">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","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":5,"href":"https:\/\/aceworldpgs.com\/tools\/wp-json\/wp\/v2\/posts\/4551\/revisions"}],"predecessor-version":[{"id":76775,"href":"https:\/\/aceworldpgs.com\/tools\/wp-json\/wp\/v2\/posts\/4551\/revisions\/76775"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aceworldpgs.com\/tools\/wp-json\/"}],"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}]}}