by Kraken.io
4.5 (119 reviews)
Kraken.io Image Optimizer – Compress, Convert to WebP & AVIF, Resize & Bulk Optimize
Optimize images automatically — compress, resize and convert to WebP, AVIF & more with Kraken.io. Faster pages, smaller files, same quality.
Compatible with WP 7
v3.0.3
Current Version v3.0.3
Updated 1 month ago
Last Update on 22 Jun, 2026
Refreshed 10 hours ago
Last Refreshed on
Rank
#2,170
+1 this week
Active Installs
10K+
+11.1%
KW Avg Position
23.8
+0.2 better
Downloads
398.4K
+21 today
Support Resolved
0%
—
No change
Rating
90%
Review 4.5 out of 5
4.5
(119 reviews)
Next Milestone 20K
10K+
20K+
729
Ranks to Climb
-
Growth Needed
8,000,000
Active Installs
Pro
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Rank Changes
Current
#2,170
Change
Best
#
Downloads Growth
Downloads
Growth
Peak
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4.5
119 reviews
Overall
90%
5
100
(84%)
4
6
(5%)
3
1
(1%)
2
2
(2%)
1
10
(8%)
Tracked Keywords
Showing 5 of 5| Keyword | Position | Change | Type | Updated |
|---|---|---|---|---|
| convert webp | 12 | — | Tag | 12 hours ago |
| compress images | 18 | — | Tag | 12 hours ago |
| optimize images | 19 | — | Tag | 12 hours ago |
| AVIF | 21 | — | Tag | 12 hours ago |
| image optimization | 49 | — | Tag | 12 hours ago |
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- Version
- 3.0.3
- Last Updated
- Jun 22, 2026
- Requires WP
- 4.9+
- Tested Up To
- 7
- PHP Version
- 5.6 or higher
- Author
- Kraken.io
Support & Rating
- Rating
- ★ ★ ★ ★ ★ 4.5
- Reviews
- 119
- Support Threads
- 0
- Resolved
- 0%
Keywords
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Frequently Asked Questions
Common questions about Kraken.io Image Optimizer – Compress, Convert to WebP & AVIF, Resize & Bulk Optimize
With intelligent lossy mode (the default), Kraken.io recompresses each image to a quality level below the threshold of human perception — 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 lossless mode in the settings.
The plugin replaces each image file with its optimized version, so optimized images stay on your site permanently — even after you deactivate or uninstall the plugin. Nothing reverts. (Keep your own backups as you would for any media, especially before bulk-optimizing.)
Two ways: open Media → Bulk Optimize with Kraken.io and run Krak 'em all to process your whole library with live progress, or switch the Media Library to List view and click Optimize in the Kraken.io column for any individual image.
Set Convert uploads to (in the panel or under Settings → Kraken.io) to WebP or AVIF. New uploads are converted to that next-gen format and the smaller files are served to browsers that support them — exactly what Google PageSpeed's "Serve images in next-gen formats" audit asks for.
JPEG, PNG, animated GIF, WebP, AVIF, HEIC/HEIF and PDF.
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.)
Yes. A single API key and secret can be used across as many sites and blogs as you like, including multisite networks — there is no per-site license.
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.
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 — backed by a mature, standalone optimization service and API.
Yes — that's the point. Compressing every size, converting to WebP/AVIF and capping oversized uploads directly address Properly size images, Efficiently encode images, Serve images in next-gen formats and Largest Contentful Paint (LCP).