Kraken.io Image Optimizer – Compress, Convert to WebP & AVIF, Resize & Bulk Optimize vs Tempaloo WebP

⚡ Compress, resize and convert your WordPress images to WebP, AVIF and more — automatically. Faster pages, smaller files, same quality. Slow pages cost you visitors, search rankings and sales — and over-sized images are almost always the culprit. Kraken.io Image Optimizer fixes that on autopilot: it compresses, resizes and converts every image you upload — and every thumbnail WordPress generates — so your whole site loads lighter and faster, without you lifting a finger. Every upload is sent to Kraken.io, 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 — install it, add your API key, and stop worrying about heavy images. At its heart is Kraken.io’s intelligent lossy engine: for every single image it finds the exact point where the file is as small as possible while staying visually indistinguishable from the original. Expect to cut 60% or more off your image weight — exactly the win Google PageSpeed and Core Web Vitals reward. 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. ✨ Why Kraken.io Intelligent lossy & lossless — pick maximum savings with no visible quality loss, or pixel-perfect lossless. Per-image JPEG quality and chroma subsampling control for power users. Convert between formats — turn uploads into WebP, AVIF, JPEG, PNG or GIF. 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 — whatever fits your site. Optimizes everything WordPress serves — the full-size image and every thumbnail size (thumbnail, medium, large, …) that actually reaches your visitors through responsive srcset. PDFs too, not just images — PDF files in your Media Library are compressed through the same Kraken.io engine, so documents download and embed faster. Smart resizing — cap oversized uploads to a maximum width/height; resized images are enhanced to stay sharp and avoid haloing. Bulk “Krak ’em all” — optimize your entire existing library from a dedicated Bulk Optimize screen or the Media Library bulk action, with live progress. A control panel that tells you everything — 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. Per-image savings & error badges — see exactly how much each image saved, right in the Media grid and list. Plays nice with your stack — 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. 🖼️ Supported formats JPEG, PNG, animated GIF, WebP, AVIF, HEIC/HEIF and PDF. (For security, raw SVG upload is intentionally not enabled — see the FAQ.) ⚡ Built for Core Web Vitals 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: Properly size images, Efficiently encode images, Serve images in next-gen formats and Largest Contentful Paint. 🎛️ Your images, your control Choose intelligent lossy or lossless, globally. Convert uploads to WebP/AVIF/JPEG/PNG/GIF on the fly — synced live between the panel and settings. Preserve selected EXIF tags (Date, Copyright, Geotag, Orientation, Profile) or strip them for the smallest files. Auto-orient photos from phones and cameras by their EXIF orientation. Decide who can optimize — all logged-in users, authors and up, or administrators only. Pick exactly which image sizes to optimize (the large 1536×1536 and 2048×2048 retina sizes are off by default to save quota — turn them on if your theme serves them). Optimize on upload automatically, or defer and bulk-optimize later. 🔒 Private & secure by design Your API credentials are stored write-only and masked — 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. 🚀 Get started for free Create a free Kraken.io account — no credit card required — and get testing quota to try the plugin and the rest of the Kraken.io toolset: A fully-featured optimization API with official libraries for PHP, Node.js, Python, Ruby, Java, Go and .NET Web Interface (free) and Web Interface PRO with resizing and sync-to-Dropbox URL Paster and Page Cruncher to optimize images in bulk from anywhere on the web Optimization history and stats, and Kraken.io Cloud Storage You can use a single API key across as many sites as you like — there is no per-site license. ★★★★★ Excellent option for image optimization “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.” — collin ★★★★★ Quality results, quality service “The plugin works really well and effortlessly, and the support is prompt, thoughtful, and thorough. I’m hooked.” — illustrata ★★★★★ Optimize according to Google PageSpeed “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.” — Walter Schaerer ★★★★★ Perfect solution to speed up site! “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!” — ezone69 Connect with Kraken.io Website: https://kraken.io Plans & pricing: https://kraken.io/pricing Twitter / X · Facebook · GitHub

The pricing problem with most WebP plugins WordPress generates 5-8 thumbnails for every image you upload (thumbnail, medium, medium_large, large, full, plus theme-specific sizes). Most popular optimizers count each thumbnail as a separate credit, so a single product photo or blog hero can burn through 6-8 credits before you’ve touched your second image. Tempaloo charges 1 credit per upload, no matter how many sizes WordPress derives from it. Same quota, 6-8x more usable conversions. Concrete comparison — 1,000 uploads / month ShortPixel / Imagify (per-thumbnail billing): 6,000 to 8,000 credits consumed → you need a 10k or 20k plan. Tempaloo (per-upload billing): 1,000 credits consumed → our 5,000-image Starter plan covers you 5x over. If your site averages 4+ thumbnails per upload (which it does, by default), Tempaloo is the lowest cost-per-converted-image on the market. Built for Agencies managing 10–100 client sites tired of credit math and license-per-site upcharges (our Growth plan covers 5 sites; Business covers unlimited). WooCommerce stores with 50+ photos per product who blow through ShortPixel quotas in days. Photographers, portfolios, magazines who want AVIF + high quality without the Imagify Pro tier. What’s in version 1.0 Async upload pipeline — conversion runs in a fresh PHP process via non-blocking loopback, so your uploads finish instantly and we never fight other plugins on the same WordPress filter chain (security scanners, page builders, other optimizers). Most optimizers convert sync inline; that’s where conflicts come from. Bulk converter with adaptive backoff, pause/resume, and live progress (current image, savings counter, ETA). Diagnostic + reconcile tab — drift detection across filesystem, attachment metadata, bulk state, and retry queue. One click to repair desynchronized state. Most optimizers leave this to the user; we audit it. AVIF on every paid tier — not a Pro-only add-on. Starter (5€/mo) already includes it. WP-CLI — wp tempaloo status / activate / bulk / restore / quota. First-class deploy story for managed WordPress hosts. Picture-tag and URL-rewrite delivery modes — picture-tag works with Gutenberg, Elementor, Bricks, Divi, Beaver Builder, WooCommerce, and any theme. URL rewrite stays out of your markup. CDN passthrough also supported. Compatibility hardening — atomic temp+rename writes, explicit nocache_headers() + DONOTCACHEPAGE so LiteSpeed Cache, WP Rocket, and W3 Total Cache never serve stale admin data. Developer hooks — three filters/actions to skip attachments, override quality, and react after conversion. See “Developer hooks” below. Pricing Free plan: 250 images / month, 1 site, no credit card required. Starter (5 €/mo): 5,000 images/month, AVIF included. Growth (12 €/mo): 25,000 images/month, 5 sites per license. Business (29 €/mo): 150,000 images/month, unlimited sites. Unlimited (59 €/mo): fair-use 500k/mo, priority SLA. Paid plans include a 7-day trial and a 30-day money-back guarantee. Credits roll over up to 30 days on paid plans. Full details at https://tempaloo.com/webp. Trademarks WebP and AVIF are open image formats developed by Google and the Alliance for Open Media respectively. Tempaloo is an independent product and is not affiliated with, endorsed by, or sponsored by Google or the Alliance for Open Media. ShortPixel, Imagify, EWWW, Smush, and Optimole are trademarks of their respective owners and are referenced for comparison purposes only. External services This plugin connects to the Tempaloo conversion API hosted at https://api.tempaloo.com to: Verify your license key when you activate the plugin. Convert images to WebP or AVIF — the plugin sends your image files (temporarily, not stored) along with your license key and site URL. Fetch your current monthly quota. Receive webhooks from Freemius (our payment processor) for subscription events. What data is sent Your license key (required for authentication). Your site URL (for license-to-site binding). The image bytes to be converted (streamed, never persisted on our servers — originals stay on your server). Your WordPress and plugin version (for compatibility diagnostics). Data retention Image data is held in memory only during conversion, then discarded. Usage logs (count of conversions, byte totals, duration) are stored for billing and analytics, associated with your license. No personal data beyond what is needed to authenticate your license: your account email (collected at activation or via Google OAuth) and the URL of the WordPress site where the license is active. Both are necessary for license enforcement and are detailed in our privacy policy at https://tempaloo.com/privacy. Providers Conversion API: Tempaloo (hosted in Frankfurt, EU). Terms of Service Privacy Policy Payment processing (paid plans only, triggered by clicking “Upgrade”): Freemius, Inc. Freemius Privacy Policy Freemius Terms By activating this plugin and entering a license key, you agree to Tempaloo’s Terms and Privacy Policy. Privacy See the External services section above for a full disclosure of the data this plugin sends to the Tempaloo API. Developer hooks Three hooks let you tailor the plugin’s behavior from your own theme or custom plugin. They fire on both the auto-convert-on-upload path and the bulk path (CLI or admin), so a single rule applies everywhere. apply_filters( 'tempaloo_webp_skip_attachment', false, $attachment_id, $mode ) Return true to bypass conversion for a specific attachment. Useful to exclude a folder, a CPT, or images larger than a threshold. apply_filters( 'tempaloo_webp_quality_for', $quality, $attachment_id, $format ) Override the quality value (1–100) per attachment. Returned values are clamped to 1–100. Useful to lift quality on portfolio shots or drop it on product thumbnails. do_action( 'tempaloo_webp_after_convert', $attachment_id, $info ) Fired after a successful conversion (one or more sizes written). $info contains format, converted, failed, mode, quality, sizes. Useful for CDN purges, custom logging, webhooks, manifest rebuilds. Example — skip conversion for any attachment in the private/ upload subfolder: add_filter( 'tempaloo_webp_skip_attachment', function( $skip, $id ) { $path = get_attached_file( $id ); return $path && false !== strpos( $path, '/uploads/private/' ); }, 10, 2 ); Source code Tempaloo WebP is open source under the GPLv2 (or later) license. All compiled assets are generated from human-readable sources included in this distribution — no obfuscated or auto-generated code without a matching source. Compiled assets The admin dashboard UI is built with Vite + React + TailwindCSS. The compiled output (build/admin.js and build/admin.css) is generated from the source files under admin-app/: TypeScript / TSX source: admin-app/src/ Build configuration: admin-app/vite.config.ts, admin-app/tsconfig.json, admin-app/tailwind.config.js, admin-app/postcss.config.js Dependency manifest: admin-app/package.json (and admin-app/package-lock.json for reproducible installs) How to rebuild From the plugin root: cd admin-app npm install npm run build This regenerates build/admin.js and build/admin.css. Output is deterministic — same source plus same lock file produce the same bytes. npm run typecheck runs the TypeScript compiler in `--noEmit` mode for a standalone type check. Third-party libraries All third-party libraries are pulled in via npm (declared in admin-app/package.json) — none are vendored as pre-built minified files in this repository. Their licenses are MIT and compatible with GPLv2-or-later. React 18 — https://react.dev (MIT) React DOM 18 — https://react.dev (MIT) clsx — https://github.com/lukeed/clsx (MIT) @freemius/checkout — https://github.com/Freemius/checkout (MIT) TailwindCSS — https://tailwindcss.com (MIT) Vite — https://vitejs.dev (MIT) PostCSS — https://postcss.org (MIT) Autoprefixer — https://github.com/postcss/autoprefixer (MIT)