{"id":28013,"date":"2014-02-24T18:57:49","date_gmt":"2014-02-24T18:57:49","guid":{"rendered":"https:\/\/wordpress.org\/plugins-wp\/kraken-image-optimizer\/"},"modified":"2026-06-16T20:46:30","modified_gmt":"2026-06-16T20:46:30","slug":"kraken-image-optimizer","status":"publish","type":"plugin","link":"https:\/\/wordpress.org\/plugins\/kraken-image-optimizer\/","author":13683073,"comment_status":"closed","ping_status":"closed","template":"","meta":{"version":"3.0.0","stable_tag":"3.0.0","tested":"7.0","requires":"4.9","requires_php":"5.6","requires_plugins":null,"header_name":"Kraken Image Optimizer","header_author":"Karim Salman","header_description":"","assets_banners_color":"30587e","last_updated":"2026-06-16 20:46:30","external_support_url":"","external_repository_url":"","donate_link":"https:\/\/kraken.io","header_plugin_uri":"http:\/\/wordpress.org\/plugins\/kraken-image-optimizer\/","header_author_uri":"https:\/\/kraken.io","rating":4.5,"author_block_rating":0,"active_installs":9000,"downloads":403805,"num_ratings":119,"support_threads":0,"support_threads_resolved":0,"author_block_count":0,"sections":["description","installation","faq","changelog"],"tags":{"1.0.1":{"tag":"1.0.1","author":"karim79","date":"2014-02-25 12:45:09"},"1.0.2":{"tag":"1.0.2","author":"karim79","date":"2014-02-26 14:36:45"},"1.0.2.1":{"tag":"1.0.2.1","author":"karim79","date":"2014-02-28 01:49:35"},"1.0.3":{"tag":"1.0.3","author":"karim79","date":"2014-03-25 00:29:03"},"1.0.3.1":{"tag":"1.0.3.1","author":"karim79","date":"2014-03-25 18:44:37"},"1.0.3.2":{"tag":"1.0.3.2","author":"karim79","date":"2014-03-25 23:34:41"},"1.0.3.3":{"tag":"1.0.3.3","author":"karim79","date":"2014-08-22 14:40:22"},"1.0.3.4":{"tag":"1.0.3.4","author":"karim79","date":"2014-08-27 00:34:30"},"1.0.4":{"tag":"1.0.4","author":"karim79","date":"2014-09-01 01:07:42"},"1.0.5":{"tag":"1.0.5","author":"karim79","date":"2014-11-29 02:54:36"},"1.0.5.1":{"tag":"1.0.5.1","author":"karim79","date":"2014-12-22 23:14:36"},"1.0.5.2":{"tag":"1.0.5.2","author":"karim79","date":"2014-12-31 19:57:14"},"1.0.5.3":{"tag":"1.0.5.3","author":"karim79","date":"2015-01-16 23:39:46"},"1.0.5.4":{"tag":"1.0.5.4","author":"karim79","date":"2015-02-27 19:57:03"},"1.0.5.5":{"tag":"1.0.5.5","author":"karim79","date":"2015-02-27 21:08:21"},"1.0.5.6":{"tag":"1.0.5.6","author":"karim79","date":"2015-02-28 16:04:13"},"1.0.5.7":{"tag":"1.0.5.7","author":"karim79","date":"2015-03-03 23:18:00"},"1.0.5.8":{"tag":"1.0.5.8","author":"karim79","date":"2015-03-12 23:57:06"},"1.0.5.9":{"tag":"1.0.5.9","author":"karim79","date":"2015-03-19 00:24:42"},"1.0.6":{"tag":"1.0.6","author":"karim79","date":"2015-03-19 00:53:38"},"1.0.7":{"tag":"1.0.7","author":"karim79","date":"2015-03-30 23:25:21"},"1.0.8":{"tag":"1.0.8","author":"karim79","date":"2015-04-05 22:33:08"},"1.0.9":{"tag":"1.0.9","author":"karim79","date":"2015-04-20 10:07:39"},"1.0.9.1":{"tag":"1.0.9.1","author":"karim79","date":"2015-04-20 11:43:25"},"2.0.0":{"tag":"2.0.0","author":"karim79","date":"2015-04-24 15:34:26"},"2.5.0":{"tag":"2.5.0","author":"karim79","date":"2016-02-16 14:41:40"},"2.5.1":{"tag":"2.5.1","author":"karim79","date":"2016-05-11 11:46:19"},"2.6.0":{"tag":"2.6.0","author":"karim79","date":"2016-08-24 12:39:19"},"2.6.1":{"tag":"2.6.1","author":"karim79","date":"2016-08-24 18:35:49"},"2.6.2":{"tag":"2.6.2","author":"karim79","date":"2018-10-26 14:19:00"},"2.6.3":{"tag":"2.6.3","author":"karim79","date":"2018-10-31 12:28:01"},"2.6.4":{"tag":"2.6.4","author":"karim79","date":"2019-06-03 11:22:15"},"2.6.5":{"tag":"2.6.5","author":"karim79","date":"2021-06-03 19:00:55"},"2.6.6":{"tag":"2.6.6","author":"karim79","date":"2022-10-21 22:30:51"},"2.6.7":{"tag":"2.6.7","author":"karim79","date":"2023-01-13 15:37:41"},"2.6.8":{"tag":"2.6.8","author":"karim79","date":"2023-01-13 16:56:43"},"2.7.0":{"tag":"2.7.0","author":"karim79","date":"2026-03-05 23:11:27"},"3.0.0":{"tag":"3.0.0","author":"karim79","date":"2026-06-16 20:46:30"}},"upgrade_notice":{"3.0.0":"<p>Major update: WebP\/AVIF\/HEIC\/PDF support, convert-on-upload, a new control panel and Bulk Optimize screen, live savings badges, and write-only masked API credentials. Recommended for everyone.<\/p>"},"ratings":{"1":10,"2":2,"3":1,"4":6,"5":100},"assets_icons":{"icon-128x128.png":{"filename":"icon-128x128.png","revision":3574976,"resolution":"128x128","location":"assets","locale":"","width":128,"height":128},"icon-256x256.png":{"filename":"icon-256x256.png","revision":3574976,"resolution":"256x256","location":"assets","locale":"","width":256,"height":256}},"assets_banners":{"banner-1544x500.png":{"filename":"banner-1544x500.png","revision":3574976,"resolution":"1544x500","location":"assets","locale":"","width":1544,"height":500},"banner-772x250.png":{"filename":"banner-772x250.png","revision":3574976,"resolution":"772x250","location":"assets","locale":"","width":772,"height":250}},"assets_blueprints":{},"all_blocks":[],"tagged_versions":["1.0.1","1.0.2","1.0.2.1","1.0.3","1.0.3.1","1.0.3.2","1.0.3.3","1.0.3.4","1.0.4","1.0.5","1.0.5.1","1.0.5.2","1.0.5.3","1.0.5.4","1.0.5.5","1.0.5.6","1.0.5.7","1.0.5.8","1.0.5.9","1.0.6","1.0.7","1.0.8","1.0.9","1.0.9.1","2.0.0","2.5.0","2.5.1","2.6.0","2.6.1","2.6.2","2.6.3","2.6.4","2.6.5","2.6.6","2.6.7","2.6.8","2.7.0","3.0.0"],"block_files":[],"assets_screenshots":{"screenshot-1.png":{"filename":"screenshot-1.png","revision":3574976,"resolution":"1","location":"assets","locale":"","width":3840,"height":2160},"screenshot-2.png":{"filename":"screenshot-2.png","revision":3574976,"resolution":"2","location":"assets","locale":"","width":3840,"height":2160},"screenshot-3.png":{"filename":"screenshot-3.png","revision":3574976,"resolution":"3","location":"assets","locale":"","width":3840,"height":2160},"screenshot-4.png":{"filename":"screenshot-4.png","revision":3574976,"resolution":"4","location":"assets","locale":"","width":3840,"height":2160},"screenshot-5.png":{"filename":"screenshot-5.png","revision":3574976,"resolution":"5","location":"assets","locale":"","width":3840,"height":2160},"screenshot-6.png":{"filename":"screenshot-6.png","revision":3574976,"resolution":"6","location":"assets","locale":"","width":3840,"height":2160}},"screenshots":{"1":"The Media Library grid with the Kraken.io control panel \u2014 connection status, quota usage and savings badges on every optimized image.","2":"The Media Library list view with the Kraken.io column showing original size, optimized size and savings per image.","3":"The Kraken.io settings page: masked write-only API credentials, optimization mode and live convert-to-WebP\/AVIF control.","4":"The Bulk Optimize with Kraken.io screen \u2014 \"Krak 'em all\" across your whole library with live progress.","5":"Advanced settings: image sizes to optimize (retina sizes off by default), EXIF preservation, who-can-optimize and more.","6":"The Support tab \u2014 reach the team through the WordPress.org forum or a pre-filled email, with diagnostics ready to copy."}},"plugin_section":[262246],"plugin_tags":[194661,56174,172146,29161,2701],"plugin_category":[50,52,54],"plugin_contributors":[79056],"plugin_business_model":[],"class_list":["post-28013","plugin","type-plugin","status-publish","hentry","plugin_section-dashboard-widgets","plugin_tags-avif","plugin_tags-compress-images","plugin_tags-convert-webp","plugin_tags-image-optimization","plugin_tags-optimize-images","plugin_category-media","plugin_category-performance","plugin_category-security-and-spam-protection","plugin_contributors-karim79","plugin_committers-karim79"],"banners":{"banner":"https:\/\/ps.w.org\/kraken-image-optimizer\/assets\/banner-772x250.png?rev=3574976","banner_2x":"https:\/\/ps.w.org\/kraken-image-optimizer\/assets\/banner-1544x500.png?rev=3574976","banner_rtl":false,"banner_2x_rtl":false},"icons":{"svg":false,"icon":"https:\/\/ps.w.org\/kraken-image-optimizer\/assets\/icon-128x128.png?rev=3574976","icon_2x":"https:\/\/ps.w.org\/kraken-image-optimizer\/assets\/icon-256x256.png?rev=3574976","generated":false},"screenshots":[{"src":"https:\/\/ps.w.org\/kraken-image-optimizer\/assets\/screenshot-1.png?rev=3574976","caption":"The Media Library grid with the Kraken.io control panel \u2014 connection status, quota usage and savings badges on every optimized image."},{"src":"https:\/\/ps.w.org\/kraken-image-optimizer\/assets\/screenshot-2.png?rev=3574976","caption":"The Media Library list view with the Kraken.io column showing original size, optimized size and savings per image."},{"src":"https:\/\/ps.w.org\/kraken-image-optimizer\/assets\/screenshot-3.png?rev=3574976","caption":"The Kraken.io settings page: masked write-only API credentials, optimization mode and live convert-to-WebP\/AVIF control."},{"src":"https:\/\/ps.w.org\/kraken-image-optimizer\/assets\/screenshot-4.png?rev=3574976","caption":"The Bulk Optimize with Kraken.io screen \u2014 \"Krak 'em all\" across your whole library with live progress."},{"src":"https:\/\/ps.w.org\/kraken-image-optimizer\/assets\/screenshot-5.png?rev=3574976","caption":"Advanced settings: image sizes to optimize (retina sizes off by default), EXIF preservation, who-can-optimize and more."},{"src":"https:\/\/ps.w.org\/kraken-image-optimizer\/assets\/screenshot-6.png?rev=3574976","caption":"The Support tab \u2014 reach the team through the WordPress.org forum or a pre-filled email, with diagnostics ready to copy."}],"raw_content":"<!--section=description-->\n<p><strong>\u26a1 Compress, resize and convert your WordPress images to WebP, AVIF and more \u2014 automatically. Faster pages, smaller files, same quality.<\/strong><\/p>\n\n<p>Slow pages cost you visitors, search rankings and sales \u2014 and over-sized images are almost always the culprit. <strong>Kraken.io Image Optimizer<\/strong> fixes that on autopilot: it compresses, resizes and converts every image you upload \u2014 <em>and<\/em> every thumbnail WordPress generates \u2014 so your whole site loads lighter and faster, without you lifting a finger.<\/p>\n\n<p>Every upload is sent to <a href=\"https:\/\/kraken.io\" title=\"Kraken.io Image Optimizer\">Kraken.io<\/a>, one of the most advanced image-optimization APIs on the web, optimized in the cloud, and pulled straight back into your Media Library. No binaries, no command line, no server tweaks \u2014 install it, add your API key, and stop worrying about heavy images.<\/p>\n\n<p>At its heart is Kraken.io's <strong>intelligent lossy<\/strong> engine: for every single image it finds the exact point where the file is as small as possible while staying <em>visually indistinguishable from the original<\/em>. Expect to cut <strong>60% or more<\/strong> off your image weight \u2014 exactly the win Google PageSpeed and Core Web Vitals reward.<\/p>\n\n<p>From a personal blog to a busy WooCommerce store with tens of thousands of products, it's an install-and-forget solution that just works.<\/p>\n\n<h4>\u2728 Why Kraken.io<\/h4>\n\n<ul>\n<li><strong>Intelligent lossy &amp; lossless<\/strong> \u2014 pick maximum savings with no visible quality loss, or pixel-perfect lossless. Per-image JPEG quality and chroma subsampling control for power users.<\/li>\n<li><strong>Convert between formats<\/strong> \u2014 turn uploads into <strong>WebP<\/strong>, <strong>AVIF<\/strong>, <strong>JPEG<\/strong>, <strong>PNG<\/strong> or <strong>GIF<\/strong>. Reach for next-gen WebP or AVIF for the biggest savings (and to clear Google's \"Serve images in next-gen formats\" audit), or switch between the classics \u2014 whatever fits your site.<\/li>\n<li><strong>Optimizes everything WordPress serves<\/strong> \u2014 the full-size image <em>and<\/em> every thumbnail size (thumbnail, medium, large, \u2026) that actually reaches your visitors through responsive <code>srcset<\/code>.<\/li>\n<li><strong>Smart resizing<\/strong> \u2014 cap oversized uploads to a maximum width\/height; resized images are <em>enhanced<\/em> to stay sharp and avoid haloing.<\/li>\n<li><strong>Bulk \"Krak 'em all\"<\/strong> \u2014 optimize your entire existing library from a dedicated Bulk Optimize screen or the Media Library bulk action, with live progress.<\/li>\n<li><strong>A control panel that tells you everything<\/strong> \u2014 a Kraken.io summary panel on the Media Library, Add Media and Plugins screens (plus a Dashboard widget) shows your connection status, plan, quota usage, active settings and supported formats at a glance.<\/li>\n<li><strong>Per-image savings &amp; error badges<\/strong> \u2014 see exactly how much each image saved, right in the Media grid and list.<\/li>\n<li><strong>Plays nice with your stack<\/strong> \u2014 works with multisite, page builders, CDNs and local\/dev sites. Detects other optimizer plugins and offers one-click deactivation so they don't fight over your images.<\/li>\n<\/ul>\n\n<h4>\ud83d\uddbc\ufe0f Supported formats<\/h4>\n\n<p>JPEG, PNG, animated GIF, <strong>WebP<\/strong>, <strong>AVIF<\/strong>, <strong>HEIC\/HEIF<\/strong> and <strong>PDF<\/strong>. (For security, raw SVG upload is intentionally not enabled \u2014 see the FAQ.)<\/p>\n\n<h4>\u26a1 Built for Core Web Vitals<\/h4>\n\n<p>Heavy images are the number-one cause of slow pages. By compressing every size, converting to WebP\/AVIF and right-sizing oversized uploads, Kraken.io directly targets the audits that move your score: <em>Properly size images<\/em>, <em>Efficiently encode images<\/em>, <em>Serve images in next-gen formats<\/em> and <em>Largest Contentful Paint<\/em>.<\/p>\n\n<h4>\ud83c\udf9b\ufe0f Your images, your control<\/h4>\n\n<ul>\n<li>Choose <strong>intelligent lossy<\/strong> or <strong>lossless<\/strong>, globally.<\/li>\n<li><strong>Convert<\/strong> uploads to WebP\/AVIF\/JPEG\/PNG\/GIF on the fly \u2014 synced live between the panel and settings.<\/li>\n<li>Preserve selected <strong>EXIF<\/strong> tags (Date, Copyright, Geotag, Orientation, Profile) or strip them for the smallest files.<\/li>\n<li><strong>Auto-orient<\/strong> photos from phones and cameras by their EXIF orientation.<\/li>\n<li>Decide <strong>who can optimize<\/strong> \u2014 all logged-in users, authors and up, or administrators only.<\/li>\n<li>Pick exactly <strong>which image sizes<\/strong> to optimize (the large 1536\u00d71536 and 2048\u00d72048 retina sizes are off by default to save quota \u2014 turn them on if your theme serves them).<\/li>\n<li>Optimize on upload automatically, or defer and bulk-optimize later.<\/li>\n<\/ul>\n\n<h4>\ud83d\udd12 Private &amp; secure by design<\/h4>\n\n<p>Your API credentials are stored <strong>write-only<\/strong> and masked \u2014 they are never pre-filled into the page or exposed in your site's source, so other users on the dashboard can't read them. Every action is protected by nonces and capability checks, uploads are content-verified, and all optimization happens server-to-server with Kraken.io. No secrets ever reach the browser.<\/p>\n\n<h4>\ud83d\ude80 Get started for free<\/h4>\n\n<blockquote>\n  <p><strong>Create a <a href=\"https:\/\/kraken.io\/pricing\" title=\"Kraken.io \u2013 Plans and Pricing\">free Kraken.io account<\/a><\/strong> \u2014 no credit card required \u2014 and get testing quota to try the plugin and the rest of the Kraken.io toolset:<\/p>\n  \n  <ul>\n  <li>A fully-featured optimization <strong>API<\/strong> with official libraries for PHP, Node.js, Python, Ruby, Java, Go and .NET<\/li>\n  <li><strong>Web Interface<\/strong> (free) and <strong>Web Interface PRO<\/strong> with resizing and sync-to-Dropbox<\/li>\n  <li><strong>URL Paster<\/strong> and <strong>Page Cruncher<\/strong> to optimize images in bulk from anywhere on the web<\/li>\n  <li>Optimization <strong>history and stats<\/strong>, and Kraken.io Cloud Storage<\/li>\n  <\/ul>\n<\/blockquote>\n\n<p>You can use a single API key across as many sites as you like \u2014 there is no per-site license.<\/p>\n\n<blockquote>\n  <p>\u2605\u2605\u2605\u2605\u2605 <strong>Excellent option for image optimization<\/strong>\n  \"The real power of Kraken is their 'intelligent lossy' optimization. I use it on all my sites and have never once needed to roll back an image because of too much quality degradation. It is a perfect solution as is.\" \u2014 <a href=\"https:\/\/profiles.wordpress.org\/collinmbarrett\">collin<\/a><\/p>\n  \n  <p>\u2605\u2605\u2605\u2605\u2605 <strong>Quality results, quality service<\/strong>\n  \"The plugin works really well and effortlessly, and the support is prompt, thoughtful, and thorough. I'm hooked.\" \u2014 <a href=\"https:\/\/profiles.wordpress.org\/illustrata\">illustrata<\/a><\/p>\n  \n  <p>\u2605\u2605\u2605\u2605\u2605 <strong>Optimize according to Google PageSpeed<\/strong>\n  \"Kraken was instrumental in optimizing images to comply with Google's PageSpeed analyzing tool. Our travel blog now sports Google's 'mobile friendly' tag for mobile searches.\" \u2014 <a href=\"https:\/\/profiles.wordpress.org\/qualterio\">Walter Schaerer<\/a><\/p>\n  \n  <p>\u2605\u2605\u2605\u2605\u2605 <strong>Perfect solution to speed up site!<\/strong>\n  \"I love this plugin! All my questions are quickly responded to and I see a huge saving in image size without losing quality. Highly recommend!\" \u2014 <a href=\"https:\/\/profiles.wordpress.org\/ezone69\">ezone69<\/a><\/p>\n<\/blockquote>\n\n<h4>Connect with Kraken.io<\/h4>\n\n<ul>\n<li>Website: <a href=\"https:\/\/kraken.io\">https:\/\/kraken.io<\/a><\/li>\n<li>Plans &amp; pricing: <a href=\"https:\/\/kraken.io\/pricing\">https:\/\/kraken.io\/pricing<\/a><\/li>\n<li><a href=\"https:\/\/twitter.com\/KrakenIO\" title=\"@KrakenIO\">Twitter \/ X<\/a> \u00b7 <a href=\"https:\/\/www.facebook.com\/krakenio\" title=\"Kraken.io\">Facebook<\/a> \u00b7 <a href=\"https:\/\/github.com\/kraken-io\" title=\"Kraken.io on GitHub\">GitHub<\/a><\/li>\n<\/ul>\n\n<!--section=installation-->\n<ol>\n<li>From your WordPress admin, go to <strong>Plugins \u2192 Add New<\/strong>, search for <strong>Kraken.io Image Optimizer<\/strong>, then click <strong>Install Now<\/strong> and <strong>Activate<\/strong>. (Or upload the plugin folder to <code>\/wp-content\/plugins\/<\/code> and activate it from the Plugins menu.)<\/li>\n<li>Create a free account and grab your API key and secret from <a href=\"https:\/\/kraken.io\/pricing\" title=\"Kraken.io \u2013 Plans and Pricing\">https:\/\/kraken.io\/pricing<\/a>.<\/li>\n<li>Go to <strong>Settings \u2192 Kraken.io<\/strong>, enter your <strong>API Key<\/strong> and <strong>API Secret<\/strong>, choose your optimization preferences, and click <strong>Save<\/strong>. A green check confirms your credentials are valid.<\/li>\n<li>Every image you upload from now on \u2014 and all of its generated thumbnails \u2014 is optimized automatically.<\/li>\n<li>To optimize images already in your library, use the <strong>Bulk Optimize with Kraken.io<\/strong> screen under <strong>Media<\/strong>, or the <strong>Optimize<\/strong> button in the Media Library list view.<\/li>\n<\/ol>\n\n<!--section=faq-->\n<dl>\n<dt id=\"will%20optimization%20reduce%20my%20image%20quality%3F\"><h3>Will optimization reduce my image quality?<\/h3><\/dt>\n<dd><p>With <strong>intelligent lossy<\/strong> mode (the default), Kraken.io recompresses each image to a quality level below the threshold of human perception \u2014 you'll find it very hard to tell the optimized image from the original, even up close, while saving well over half the file size. Prefer pixel-perfect results? Switch to <strong>lossless<\/strong> mode in the settings.<\/p><\/dd>\n<dt id=\"are%20my%20original%20images%20kept%2C%20and%20what%20happens%20if%20i%20uninstall%20the%20plugin%3F\"><h3>Are my original images kept, and what happens if I uninstall the plugin?<\/h3><\/dt>\n<dd><p>The plugin replaces each image file with its optimized version, so optimized images stay on your site permanently \u2014 even after you deactivate or uninstall the plugin. Nothing reverts. (Keep your own backups as you would for any media, especially before bulk-optimizing.)<\/p><\/dd>\n<dt id=\"how%20do%20i%20optimize%20images%20i%20uploaded%20before%20installing%20the%20plugin%3F\"><h3>How do I optimize images I uploaded before installing the plugin?<\/h3><\/dt>\n<dd><p>Two ways: open <strong>Media \u2192 Bulk Optimize with Kraken.io<\/strong> and run <strong>Krak 'em all<\/strong> to process your whole library with live progress, or switch the Media Library to <strong>List<\/strong> view and click <strong>Optimize<\/strong> in the Kraken.io column for any individual image.<\/p><\/dd>\n<dt id=\"how%20do%20i%20serve%20webp%20or%20avif%20images%3F\"><h3>How do I serve WebP or AVIF images?<\/h3><\/dt>\n<dd><p>Set <strong>Convert uploads to<\/strong> (in the panel or under Settings \u2192 Kraken.io) to <strong>WebP<\/strong> or <strong>AVIF<\/strong>. New uploads are converted to that next-gen format and the smaller files are served to browsers that support them \u2014 exactly what Google PageSpeed's \"Serve images in next-gen formats\" audit asks for.<\/p><\/dd>\n<dt id=\"which%20file%20types%20are%20supported%3F\"><h3>Which file types are supported?<\/h3><\/dt>\n<dd><p>JPEG, PNG, animated GIF, WebP, AVIF, HEIC\/HEIF and PDF.<\/p><\/dd>\n<dt id=\"why%20can%27t%20i%20upload%20or%20optimize%20svg%20files%3F\"><h3>Why can't I upload or optimize SVG files?<\/h3><\/dt>\n<dd><p>SVG is XML that can carry inline scripts and event handlers, which makes raw SVG uploads a stored cross-site-scripting (XSS) risk. For your site's safety the plugin does not enable raw SVG uploads. (Kraken.io's API can optimize SVG; safe in-WordPress support requires a markup sanitizer and an explicit, high-trust opt-in, which is on the roadmap.)<\/p><\/dd>\n<dt id=\"can%20i%20use%20one%20account%20on%20more%20than%20one%20site%3F\"><h3>Can I use one account on more than one site?<\/h3><\/dt>\n<dd><p>Yes. A single API key and secret can be used across as many sites and blogs as you like, including multisite networks \u2014 there is no per-site license.<\/p><\/dd>\n<dt id=\"does%20it%20work%20on%20local%20or%20staging%20sites%3F\"><h3>Does it work on local or staging sites?<\/h3><\/dt>\n<dd><p>Yes. Images are uploaded to Kraken.io from your server rather than fetched by URL, so the plugin works on local, staging and unpublished installations, and behind firewalls or basic auth.<\/p><\/dd>\n<dt id=\"how%20is%20this%20different%20from%20smush%2C%20shortpixel%2C%20imagify%2C%20ewww%20or%20tinypng%3F\"><h3>How is this different from Smush, ShortPixel, Imagify, EWWW or TinyPNG?<\/h3><\/dt>\n<dd><p>Kraken.io's focus is the precise balance between quality and file size: its intelligent lossy engine targets the greatest possible savings while keeping results indistinguishable from the original to the human eye. If you want maximum compression without ever having to eyeball the result against the source, this is the plugin for you \u2014 backed by a mature, standalone optimization service and API.<\/p><\/dd>\n<dt id=\"will%20it%20help%20my%20google%20pagespeed%20%2F%20core%20web%20vitals%20scores%3F\"><h3>Will it help my Google PageSpeed \/ Core Web Vitals scores?<\/h3><\/dt>\n<dd><p>Yes \u2014 that's the point. Compressing every size, converting to WebP\/AVIF and capping oversized uploads directly address <em>Properly size images<\/em>, <em>Efficiently encode images<\/em>, <em>Serve images in next-gen formats<\/em> and Largest Contentful Paint (LCP).<\/p><\/dd>\n<dt id=\"can%20i%20keep%20or%20strip%20exif%20metadata%3F\"><h3>Can I keep or strip EXIF metadata?<\/h3><\/dt>\n<dd><p>Both. Choose which EXIF tags to preserve (Date, Copyright, Geotag, Orientation, Profile) under the advanced settings; anything you don't preserve is stripped for the smallest possible files.<\/p><\/dd>\n<dt id=\"can%20i%20limit%20who%20is%20allowed%20to%20optimize%20images%3F\"><h3>Can I limit who is allowed to optimize images?<\/h3><\/dt>\n<dd><p>Yes. The <strong>Who can optimize images<\/strong> advanced setting lets you allow all logged-in users (default), authors and above, or administrators only \u2014 useful on membership, WooCommerce or forum sites where you don't want untrusted accounts spending your quota.<\/p><\/dd>\n<dt id=\"will%20it%20change%20my%20filenames%2C%20alt%20text%20or%20image%20urls%3F\"><h3>Will it change my filenames, ALT text or image URLs?<\/h3><\/dt>\n<dd><p>No. The plugin optimizes the image bytes in place \u2014 your filenames, URLs, ALT text, titles and captions stay exactly as they are. Your links and SEO are never touched.<\/p><\/dd>\n<dt id=\"can%20i%20hide%20my%20api%20key%20from%20other%20people%20on%20the%20dashboard%3F\"><h3>Can I hide my API key from other people on the dashboard?<\/h3><\/dt>\n<dd><p>Yes. Your API key and secret are stored <strong>write-only<\/strong> and masked \u2014 never pre-filled into the settings form and never present in the page source \u2014 so other administrators and editors can't read your credentials.<\/p><\/dd>\n<dt id=\"how%20do%20i%20report%20a%20security%20issue%3F\"><h3>How do I report a security issue?<\/h3><\/dt>\n<dd><p>Please email <strong>support@kraken.io<\/strong> with the details. We take responsible disclosure seriously and will respond promptly.<\/p><\/dd>\n<dt id=\"is%20the%20plugin%20free%3F%20do%20i%20need%20a%20paid%20plan%3F\"><h3>Is the plugin free? Do I need a paid plan?<\/h3><\/dt>\n<dd><p>The plugin is free. It connects to the Kraken.io service, which offers a free account with testing quota (no credit card required) and affordable paid plans as you grow. See current plans at <a href=\"https:\/\/kraken.io\/pricing\">https:\/\/kraken.io\/pricing<\/a>.<\/p><\/dd>\n\n<\/dl>\n\n<!--section=changelog-->\n<h4>3.0.0<\/h4>\n\n<ul>\n<li>New: optimization support for <strong>WebP, AVIF, HEIC, HEIF and PDF<\/strong> (in addition to JPEG, PNG and GIF).<\/li>\n<li>New: <strong>convert uploads<\/strong> to WebP, AVIF, JPEG, PNG or GIF on the fly, synced live between the Media panel and settings.<\/li>\n<li>New: a <strong>Kraken.io control panel<\/strong> on the Media Library, Add Media and Plugins screens, plus a Dashboard widget \u2014 showing connection status, plan, quota usage, active settings and supported formats.<\/li>\n<li>New: a dedicated <strong>Bulk Optimize with Kraken.io<\/strong> screen, reachable from the Media menu, the Media Library and the panel.<\/li>\n<li>New: <strong>per-image savings and error badges<\/strong> in the Media grid and list, updated live as images optimize.<\/li>\n<li>New: <strong>conflicting-optimizer detection<\/strong> with one-click deactivation of other image plugins.<\/li>\n<li>New: <strong>\"Who can optimize images\"<\/strong> capability setting (all logged-in users by default).<\/li>\n<li>New: a <strong>Support<\/strong> tab linking to the WordPress.org forum and a pre-filled email, with copyable diagnostics.<\/li>\n<li>Security: API key and secret are now <strong>write-only and masked<\/strong> \u2014 never pre-filled or exposed in the page source; nonce and capability checks on all AJAX actions; uploads are content-verified; raw SVG upload disabled as an XSS precaution.<\/li>\n<li>Change: the large <strong>1536\u00d71536 and 2048\u00d72048<\/strong> retina sizes are now off by default to save quota (filterable; existing choices are respected).<\/li>\n<li>Change: legacy WebP companion options are deprecated in favour of Convert.<\/li>\n<li>Fix: a now-resolved error no longer keeps showing an error badge after a successful re-optimization.<\/li>\n<li>Fix: the bulk count now lists only supported image formats (no more HTML\/other files).<\/li>\n<li>Fix: division-by-zero when calculating savings on PHP 8; assets are cache-busted by file modification time.<\/li>\n<\/ul>\n\n<h4>2.7.0<\/h4>\n\n<ul>\n<li>Complete plugin rewrite with a modular OOP architecture.<\/li>\n<li>Added WebP image generation and display support.<\/li>\n<li>Added background processing for image optimization.<\/li>\n<li>Added support for WP Retina 2x, NextGen Gallery and WP Offload Media.<\/li>\n<li>Security: capability and nonce checks on the reset-all AJAX handler; input sanitization; whitelist validation for the settings tab parameter.<\/li>\n<li>Requires PHP 5.6+ and WordPress 4.9+.<\/li>\n<\/ul>\n\n<h4>2.6.6<\/h4>\n\n<ul>\n<li>Security release to solve https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2022-38454<\/li>\n<\/ul>\n\n<h4>2.6.0<\/h4>\n\n<ul>\n<li>Added the ability to choose which image sizes get optimized.<\/li>\n<li>Added the ability to change the chroma subsampling scheme for JPEG images.<\/li>\n<li>Stability and compatibility improvements.<\/li>\n<\/ul>\n\n<h4>2.5.0<\/h4>\n\n<ul>\n<li>Optionally disable optimization of the main image for faster uploads.<\/li>\n<li>Restrict the maximum dimensions of uploads (resizing), with sharpening enhancement.<\/li>\n<li>Force a discrete JPEG quality value; preserve selected EXIF tags; auto-orient by EXIF.<\/li>\n<\/ul>\n\n<h4>2.0.0<\/h4>\n\n<ul>\n<li>Kraken.io settings moved to their own section (Settings \u2192 Kraken.io) with grouped Advanced Settings.<\/li>\n<\/ul>\n\n<h4>1.0.3<\/h4>\n\n<ul>\n<li>Added the \"Krak 'em all\" bulk optimization feature to the Media Library Bulk Actions menu.<\/li>\n<\/ul>\n\n<h4>1.0<\/h4>\n\n<ul>\n<li>First release: lossy and lossless optimization of JPG, PNG and GIF (including animated GIF), with automatic optimization of uploads and their thumbnails.<\/li>\n<\/ul>\n\n<p>For the full version history of older releases, see the plugin's WordPress.org changelog.<\/p>","raw_excerpt":"Optimize images automatically \u2014 compress, resize and convert to WebP, AVIF &amp; more with Kraken.io. Faster pages, smaller files, same quality.","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wordpress.org\/plugins\/wp-json\/wp\/v2\/plugin\/28013","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wordpress.org\/plugins\/wp-json\/wp\/v2\/plugin"}],"about":[{"href":"https:\/\/wordpress.org\/plugins\/wp-json\/wp\/v2\/types\/plugin"}],"replies":[{"embeddable":true,"href":"https:\/\/wordpress.org\/plugins\/wp-json\/wp\/v2\/comments?post=28013"}],"author":[{"embeddable":true,"href":"https:\/\/wordpress.org\/plugins\/wp-json\/wporg\/v1\/users\/karim79"}],"wp:attachment":[{"href":"https:\/\/wordpress.org\/plugins\/wp-json\/wp\/v2\/media?parent=28013"}],"wp:term":[{"taxonomy":"plugin_section","embeddable":true,"href":"https:\/\/wordpress.org\/plugins\/wp-json\/wp\/v2\/plugin_section?post=28013"},{"taxonomy":"plugin_tags","embeddable":true,"href":"https:\/\/wordpress.org\/plugins\/wp-json\/wp\/v2\/plugin_tags?post=28013"},{"taxonomy":"plugin_category","embeddable":true,"href":"https:\/\/wordpress.org\/plugins\/wp-json\/wp\/v2\/plugin_category?post=28013"},{"taxonomy":"plugin_contributors","embeddable":true,"href":"https:\/\/wordpress.org\/plugins\/wp-json\/wp\/v2\/plugin_contributors?post=28013"},{"taxonomy":"plugin_business_model","embeddable":true,"href":"https:\/\/wordpress.org\/plugins\/wp-json\/wp\/v2\/plugin_business_model?post=28013"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}