ShortPixel is an image optimization plugin that compresses images through a cloud-based API, reducing file sizes without visible quality loss. It supports three compression modes: lossy (maximum compression, visually lossless), glossy (high quality with good compression), and lossless (perfect quality with moderate compression). The plugin automatically optimizes images on upload, or you can run bulk optimization on existing images. It also converts images to WebP and AVIF formats, and offers a global CDN that serves optimized images from edge locations. ShortPixel is one of the most reliable image optimization services, competing with Imagify and EWWW Image Optimizer, with a generous free tier of 100 images per month.
The plugin processes images on ShortPixel’s cloud servers, then downloads the optimized versions back to your media library. It preserves original files as backups and supports scheduled optimization for automatic processing.
Competitive Features
- Compression modes — lossy, glossy, and lossless with quality control per image
- WebP conversion — automatic WebP generation with picture tag or URL delivery
- AVIF conversion — next-gen AVIF format for modern browsers
- Image CDN — global CDN serving optimized images from 20+ edge locations
- Bulk optimization — compress all existing images with progress tracking
- PDF compression — optimize PDF files in the media library
- Retina support — generate 2x and 3x images for high-DPI displays
Key Features
- Auto-optimization — compress images automatically when uploaded to the media library
- Smart crop — intelligent cropping to focus on important image areas
- EXIF management — keep or remove EXIF metadata from compressed images
- Image backup — restore original images at any time
- Cron optimization — scheduled optimization for new images added outside the media library
- Gallery plugin support — works with NextGEN, FooGallery, and other gallery plugins
- WP-CLI — command-line optimization for automated workflows
Comparison with Competitors
ShortPixel vs Imagify
| Aspect | ShortPixel | Imagify |
|---|---|---|
| Compression modes | 3 (lossy/glossy/lossless) | 3 (normal/aggressive/ultra) |
| WebP conversion | Yes | Yes |
| AVIF conversion | Yes | Yes |
| Image CDN | Yes (paid) | No |
| PDF compression | Yes | Yes |
Bottom line: ShortPixel offers more free compression (100 images vs 25 MB) and an image CDN. Imagify has a simpler interface and is from the WP Rocket team.
ShortPixel vs EWWW Image Optimizer
| Aspect | ShortPixel | EWWW Image Optimizer |
|---|---|---|
| Compression method | Cloud API | Local + Cloud API |
| Requires server tools | No | Yes (free mode) |
| WebP conversion | Yes | Yes |
| AVIF conversion | Yes | Yes |
| Image CDN | Yes | Yes (Easy IO) |
Bottom line: EWWW offers unlimited free compression if your server supports local tools. ShortPixel works on any hosting without server requirements and has a generous free tier.
Recommended Stack: ShortPixel handles image optimization. For full page caching, pair with WP Rocket.
Official Changelog
Version 6.5.6
Release Date: September 9, 2026
- Security: Hardened Content Replacement — the content replacer now blocks PHP object instantiation when processing serialized data, preventing potential object injection through crafted data.
- Fix: Automatic Backup Removal — fixed an issue that prevented the automatic removal of old backups from ever running, even when the option was enabled.
- Changed: CDN Links & Crawlers — changed the parameter separator in CDN links from a comma to a plus sign, preventing some crawlers and SEO tools from misreading srcset URLs.
Version 6.5.5
Release Date: August 20, 2026
- Fix: Download Error Handling — fixed a fatal error that could occur when ShortPixel was unable to download an optimized file from the API, with clearer error messages now shown.
- Fix: Queue Robustness — fixed a PHP warning that could occur when processing queue items without a remote ID.
- Fix: AJAX Response Fix — fixed a possible issue when sending array-based responses during optimization processing.
Version 6.5.4
Release Date: July 6, 2026
- Improvement: Smarter Credit Handling — automatic image optimization will now continue even if AI credits are exhausted, as long as image optimization credits are still available.
- Fix: AVIF Loop Prevention — fixed a rare case where PHP limitations could not identify the MIME type correctly and could cause an infinite optimization loop for some AVIF files.
- Improvement: Cleaner Browser Console — removed optimization-related console logs from production; they are now only shown when plugin debug mode is enabled.
- Fix: Queue Stability — fixed a rare error that could occur under specific conditions within the optimization queue.
- Improvement: Better Bulk Error Help — bulk processing errors now link directly to the ShortPixel Knowledge Base search.
- Improvement: WordPress 7.0 UI Tweaks — updated the Bulk Processing interface to better match the layout and styling changes introduced in WordPress 7.0.
Frequently Asked Questions
Is ShortPixel free?
The free version includes 100 image compressions per month. Paid plans start at $4.99/month for 5,000 images.
What compression mode should I use?
Glossy mode is recommended for most sites — it provides better visual quality than lossy with similar file size reduction. Lossless is best for images where perfect quality is critical.
Does ShortPixel support WebP?
Yes. ShortPixel automatically generates WebP versions of your images and serves them to supported browsers using picture tags or URL rewriting.
Can I restore original images?
Yes. ShortPixel keeps a backup of all original images. You can restore any image to its original state from the media library.
Does ShortPixel work on any hosting?
Yes. ShortPixel uses a cloud-based API, so it works on any hosting without requiring server tools or specific PHP extensions.
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