Freemius

levmedia123

No account. No API. No images leaving your server.
Shrinkwell helps you compress images, convert them to modern formats and reduce backup size by finding possibly unused media in your WordPress database. Processing stays local, with no media files uploaded externally for optimization.
Run a 5-image test, review the results, then optimize your full media library with more confidence.
<h4>Built for agencies and freelancers handing off client sites</h4>
Shrinkwell was designed for the moment before you hand a site back to a client and need to prove the optimization work was actually done.
<ul>
<li>Safe test run — optimize 5 images first and inspect the results before touching the full library.</li>
<li>Original backups — keep originals before files are replaced, then restore individual images or the full library when needed.</li>
<li>Delivery proof — scan a live page URL and confirm that WebP files are actually being served, not just generated.</li>
<li>SEO scan — find missing alt text and weak filenames without auto-rewriting anything.</li>
</ul>
<h4>Compression that doesn’t guess</h4>
Choose a named compression profile or dial in your own settings:
<ul>
<li>Balanced — solid savings with sensible quality preservation. Good for most sites.</li>
<li>High — stronger reduction. Best for image-heavy sites where speed matters most.</li>
<li>Near lossless — minimal quality change. Useful for portfolios and product photography.</li>
<li>Custom — a 1–10 strength slider for full control.</li>
</ul>
Shrinkwell can generate WebP automatically and serve it with a safe JPEG/PNG fallback, with no .htaccess edits and no CDN required.
<h4>What you get in the free version</h4>
<ul>
<li>Convert images to WebP and AVIF within the monthly free limit</li>
<li>Manually bulk-optimize JPEG and PNG within the monthly free limit</li>
<li>Preserve existing WebP media items instead of recompressing them</li>
<li>Resize oversized images to a maximum width and height</li>
<li>Strip EXIF/metadata where supported</li>
<li>Optimize thumbnails alongside originals</li>
<li>Generate and serve WebP with automatic JPEG/PNG fallback</li>
<li>Restore individual images or run a bulk restore</li>
<li>Run a Media Cleanup database scan and preview possibly unused images</li>
<li>Review an optimization log with bytes saved, skipped images, and skip reasons</li>
<li>Run a frontend delivery test to confirm active WebP delivery</li>
<li>Run a site scan and apply recommended settings in one click</li>
<li>Works with GD and Imagick, with no external service required</li>
</ul>
<h4>Shrinkwell Pro</h4>
Shrinkwell Pro unlocks unlimited optimization and safe Media Cleanup. That includes unlimited WebP and AVIF optimization, auto-optimize on upload, background bulk optimization, safe bulk cleanup actions, Shrinkwell Trash and advanced cleanup tools.
<h4>What Shrinkwell doesn’t do</h4>
Shrinkwell does not send media files to an external API for optimization, require an account, charge per image, or rewrite alt text or filenames automatically.
<h3>Privacy</h3>
Images are optimized on your own server. The free plugin does not transmit media files externally for optimization.
<h3>License & Assets</h3>
Shrinkwell is licensed under GPLv2 or later.
The included Shrinkwell logo and wordmark are original Levmedia brand assets and are distributed with this plugin under GPLv2 or later.

Shrinkwell Image Optimizer

Optimize images with WebP and AVIF, then review possibly unused media safely.

Kraken.io

⚡ 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 <a href="https://kraken.io" title="Kraken.io Image Optimizer" rel="nofollow ugc">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 — 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.
<h4>✨ Why Kraken.io</h4>
<ul>
<li>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.</li>
<li>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.</li>
<li>Optimizes everything WordPress serves — the full-size image and every thumbnail size (thumbnail, medium, large, …) that actually reaches your visitors through responsive <code>srcset</code>.</li>
<li>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.</li>
<li>Smart resizing — cap oversized uploads to a maximum width/height; resized images are enhanced to stay sharp and avoid haloing.</li>
<li>Bulk “Krak ’em all” — optimize your entire existing library from a dedicated Bulk Optimize screen or the Media Library bulk action, with live progress.</li>
<li>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.</li>
<li>Per-image savings & error badges — see exactly how much each image saved, right in the Media grid and list.</li>
<li>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.</li>
</ul>
<h4>🖼️ Supported formats</h4>
JPEG, PNG, animated GIF, WebP, AVIF, HEIC/HEIF and PDF. (For security, raw SVG upload is intentionally not enabled — see the FAQ.)
<h4>⚡ Built for Core Web Vitals</h4>
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.
<h4>🎛️ Your images, your control</h4>
<ul>
<li>Choose intelligent lossy or lossless, globally.</li>
<li>Convert uploads to WebP/AVIF/JPEG/PNG/GIF on the fly — synced live between the panel and settings.</li>
<li>Preserve selected EXIF tags (Date, Copyright, Geotag, Orientation, Profile) or strip them for the smallest files.</li>
<li>Auto-orient photos from phones and cameras by their EXIF orientation.</li>
<li>Decide who can optimize — all logged-in users, authors and up, or administrators only.</li>
<li>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).</li>
<li>Optimize on upload automatically, or defer and bulk-optimize later.</li>
</ul>
<h4>🔒 Private & secure by design</h4>
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.
<h4>🚀 Get started for free</h4>
<blockquote>
Create a <a href="https://kraken.io/pricing" title="Kraken.io – Plans and Pricing" rel="nofollow ugc">free Kraken.io account</a> — no credit card required — and get testing quota to try the plugin and the rest of the Kraken.io toolset:
<ul>
<li>A fully-featured optimization API with official libraries for PHP, Node.js, Python, Ruby, Java, Go and .NET</li>
<li>Web Interface (free) and Web Interface PRO with resizing and sync-to-Dropbox</li>
<li>URL Paster and Page Cruncher to optimize images in bulk from anywhere on the web</li>
<li>Optimization history and stats, and Kraken.io Cloud Storage</li>
</ul>
</blockquote>
You can use a single API key across as many sites as you like — there is no per-site license.
<blockquote>
★★★★★ 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.” — <a href="https://profiles.wordpress.org/collinmbarrett" rel="nofollow ugc">collin</a>
★★★★★ Quality results, quality service 
 “The plugin works really well and effortlessly, and the support is prompt, thoughtful, and thorough. I’m hooked.” — <a href="https://profiles.wordpress.org/illustrata" rel="nofollow ugc">illustrata</a>
★★★★★ 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.” — <a href="https://profiles.wordpress.org/qualterio" rel="nofollow ugc">Walter Schaerer</a>
★★★★★ 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!” — <a href="https://profiles.wordpress.org/ezone69" rel="nofollow ugc">ezone69</a>
</blockquote>
<h4>Connect with Kraken.io</h4>
<ul>
<li>Website: <a href="https://kraken.io" rel="nofollow ugc">https://kraken.io</a></li>
<li>Plans & pricing: <a href="https://kraken.io/pricing" rel="nofollow ugc">https://kraken.io/pricing</a></li>
<li><a href="https://twitter.com/KrakenIO" title="@KrakenIO" rel="nofollow ugc">Twitter / X</a> · <a href="https://www.facebook.com/krakenio" title="Kraken.io" rel="nofollow ugc">Facebook</a> · <a href="https://github.com/kraken-io" title="Kraken.io on GitHub" rel="nofollow ugc">GitHub</a></li>
</ul>

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

- It works with 1 image but not at Google PageSpeed standard
- It doesn't work with bulk action
- The worst thing is I inputted my credit card there and they refused to let me cancel my subscription, what a very bad thing from kraken.io

Does not work for bulk actions, subscription cannot be cancelled

As others are noting here, their customer service is terrible. In fact I'd use the word "non-existent".

After signing up with an account I decided that the service was no longer what I needed and contacted them to delete my account. Multiple times, in different ways, I've contacted their customer support about this and never had a response. Currently breaching GDPR rules, they're going to be reported.

Thank goodness I never handed over any payments to them.

Terrible Customer Service

Optimize images automatically — compress, resize and convert to WebP, AVIF & more with Kraken.io. Faster pages, smaller files, same quality.

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