{"id":13837,"date":"2026-01-09T12:02:31","date_gmt":"2026-01-09T12:02:31","guid":{"rendered":"https:\/\/www.copebusiness.com\/?p=13837"},"modified":"2026-02-07T10:34:52","modified_gmt":"2026-02-07T10:34:52","slug":"how-to-regenerate-pdf-thumbnails-in-wordpress-easy-guide","status":"publish","type":"post","link":"https:\/\/www.copebusiness.com\/fr\/wordpress\/comment-regenerer-pdf-thumbnails-en-motpress-easy-guide\/","title":{"rendered":"How to Regenerate PDF Thumbnails in WordPress (Easy Guide)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">PDF thumbnails in WordPress provide a visual preview of uploaded PDF files in your media library, making it easier to manage documents. However, thumbnails can sometimes fail to generate, become corrupted, or not update after changes\u2014leading to blank icons or outdated previews. Regenerating them restores proper display and can resolve related performance issues. At Cope Business, we often address thumbnail problems during our <a href=\"https:\/\/www.copebusiness.com\/technical-seo-services\/technical-seo-audit-service\/\" data-type=\"link\" data-id=\"https:\/\/www.copebusiness.com\/technical-seo-services\/technical-seo-audit-service\/\" target=\"_blank\" rel=\"noreferrer noopener\">technical SEO audit services<\/a>, as optimized media contributes to faster loading and better user experience. This guide covers why thumbnails matter, when to regenerate, and two simple methods to do it in WordPress.<br>Whether you&#8217;re dealing with a large document library or just fixing a single file, these steps will get your thumbnails back on track.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">On this page<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #0a0a0a;color:#0a0a0a\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #0a0a0a;color:#0a0a0a\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.copebusiness.com\/fr\/wordpress\/comment-regenerer-pdf-thumbnails-en-motpress-easy-guide\/#Why_Regenerate_PDF_Thumbnails_in_WordPress\" >Why Regenerate PDF Thumbnails in WordPress?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.copebusiness.com\/fr\/wordpress\/comment-regenerer-pdf-thumbnails-en-motpress-easy-guide\/#Method_1_Using_a_Plugin_Recommended_for_Beginners\" >Method 1: Using a Plugin (Recommended for Beginners)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.copebusiness.com\/fr\/wordpress\/comment-regenerer-pdf-thumbnails-en-motpress-easy-guide\/#Method_2_Using_Custom_Code_For_Advanced_Users\" >Method 2: Using Custom Code (For Advanced Users)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.copebusiness.com\/fr\/wordpress\/comment-regenerer-pdf-thumbnails-en-motpress-easy-guide\/#Best_Practices_After_Regeneration\" >Best Practices After Regeneration<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Regenerate_PDF_Thumbnails_in_WordPress\"><\/span>Why Regenerate PDF Thumbnails in WordPress?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">WordPress generates thumbnails automatically when you upload PDFs, using libraries like ImageMagick or GD to create image previews. Issues arise from:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Server configuration problems (e.g., missing libraries).<\/li>\n\n\n\n<li>Plugin\/theme conflicts.<\/li>\n\n\n\n<li>File size limits or corrupted uploads.<\/li>\n\n\n\n<li>Changes in WordPress version or hosting environment.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Regenerating fixes these, ensuring consistent previews, better organization, and improved site performance. It&#8217;s also useful after bulk uploads or migrations.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_1_Using_a_Plugin_Recommended_for_Beginners\"><\/span>Method 1: Using a Plugin (Recommended for Beginners)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Plugins automate the process, handling single files or bulk regeneration without code.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Recommended Plugin: Regenerate Thumbnails<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This free plugin is reliable and works with PDFs via your server&#8217;s imaging libraries.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Steps<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Install and activate <strong>Regenerate Thumbnails<\/strong> from <strong>Plugins &gt; Add New<\/strong>.<\/li>\n\n\n\n<li>Go to <strong>Media &gt; Library<\/strong> and select the PDF(s) you want to regenerate (use bulk select for multiple).<\/li>\n\n\n\n<li>From the bulk actions dropdown, choose &#8220;Regenerate Thumbnails&#8221; and click &#8220;Apply&#8221;.<\/li>\n\n\n\n<li>For all media: Go to <strong>Tools &gt; Regenerate Thumbnails<\/strong> and click &#8220;Regenerate All Thumbnails&#8221;.<\/li>\n\n\n\n<li>Wait for the process to complete\u2014larger libraries may take time.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Tips<\/strong>: If thumbnails still don&#8217;t generate, check if your host supports ImageMagick (contact support to enable if needed). For advanced options, the pro version adds queueing and scheduling.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternative: <strong>Force Regenerate Thumbnails<\/strong> (free) offers similar functionality with extra filters.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_2_Using_Custom_Code_For_Advanced_Users\"><\/span>Method 2: Using Custom Code (For Advanced Users)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For more control or automation, add code to regenerate thumbnails programmatically.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Steps<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Install <strong>WPCode<\/strong> (free) for safe code insertion.<\/li>\n\n\n\n<li>Go to <strong>Code Snippets &gt; Add Snippet<\/strong> and create a new one.<\/li>\n\n\n\n<li>Paste this PHP code.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>PHP<code>function regenerate_pdf_thumbnails() { $attachments = get_posts( array( 'post_type' =&gt; 'attachment', 'posts_per_page' =&gt; -1, 'post_mime_type' =&gt; 'application\/pdf' ) ); if ( $attachments ) { foreach ( $attachments as $attachment ) { wp_update_attachment_metadata( $attachment-&gt;ID, wp_generate_attachment_metadata( $attachment-&gt;ID, get_attached_file( $attachment-&gt;ID ) ) ); } } } add_action( 'admin_init', 'regenerate_pdf_thumbnails' );<\/code><\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Activate the snippet\u2014visit any admin page to trigger regeneration.<\/li>\n\n\n\n<li>Remove or deactivate the snippet after running to avoid unnecessary load.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Tips<\/strong>: This targets PDFs only. Test on a staging site first to avoid issues.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Best_Practices_After_Regeneration\"><\/span>Best Practices After Regeneration<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Verify Thumbnails<\/strong>: Check the media library for previews.<\/li>\n\n\n\n<li><strong>Optimize Performance<\/strong>: Compress PDFs with tools like ShortPixel to reduce file sizes.<\/li>\n\n\n\n<li><strong>Enable Better PDF Support<\/strong>: Use plugins like PDF Embedder for inline viewing.<\/li>\n\n\n\n<li><strong>SEO Boost<\/strong>: Add descriptive alt text to PDF thumbnails for accessibility and search.<\/li>\n\n\n\n<li><strong>Prevent Future Issues<\/strong>: Ensure hosting has proper PHP extensions (Imagick\/GD) and keep WordPress updated.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Regenerating thumbnails is a quick fix that enhances your site&#8217;s usability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Struggling with thumbnail issues or need a full media audit? <a href=\"https:\/\/www.copebusiness.com\/contact\/\" target=\"_blank\" data-type=\"link\" data-id=\"https:\/\/www.copebusiness.com\/contact\/\" rel=\"noreferrer noopener\">Contact Cope Business<\/a> for a free technical SEO consultation\u2014we&#8217;ll diagnose and optimize your WordPress media library for peak performance.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PDF thumbnails in WordPress provide a visual preview of uploaded PDF files in your media library, making it easier to [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":13838,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[177],"tags":[],"class_list":["post-13837","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-wordpress"],"jetpack_publicize_connections":[],"_links":{"self":[{"href":"https:\/\/www.copebusiness.com\/fr\/wp-json\/wp\/v2\/posts\/13837","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.copebusiness.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.copebusiness.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.copebusiness.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.copebusiness.com\/fr\/wp-json\/wp\/v2\/comments?post=13837"}],"version-history":[{"count":2,"href":"https:\/\/www.copebusiness.com\/fr\/wp-json\/wp\/v2\/posts\/13837\/revisions"}],"predecessor-version":[{"id":14857,"href":"https:\/\/www.copebusiness.com\/fr\/wp-json\/wp\/v2\/posts\/13837\/revisions\/14857"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.copebusiness.com\/fr\/wp-json\/wp\/v2\/media\/13838"}],"wp:attachment":[{"href":"https:\/\/www.copebusiness.com\/fr\/wp-json\/wp\/v2\/media?parent=13837"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.copebusiness.com\/fr\/wp-json\/wp\/v2\/categories?post=13837"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.copebusiness.com\/fr\/wp-json\/wp\/v2\/tags?post=13837"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}