EWWW Image Optimizer is one of the most popular image optimization plugins for WordPress, with over 49 million downloads. It compresses images automatically when you upload them, or run a bulk optimization for existing images, without any size limits. The plugin works in two modes: local compression using server tools like jpegtran and optipng, or cloud-based compression using the EWWW API for hosts that don’t support local processing. It supports WebP and AVIF conversion, lazy loading, automatic image scaling, and CDN delivery through the Easy IO service. Unlike plugins like Imagify and ShortPixel that limit free compression, EWWW offers unlimited image optimization for free with local processing.
The premium version adds 5x better compression ratios, PDF optimization, automatic WebP and AVIF delivery, CDN image hosting, and a complete performance plugin (SWIS) with page caching and CSS optimization.
Competitive Features
- Unlimited compression — no image count or size limits, completely free with local server tools
- WebP and AVIF conversion — generate next-gen formats automatically with multiple delivery methods
- Easy IO CDN — cloud-based image CDN that compresses, scales, and serves images globally
- Automatic image scaling — “Bulk Resize” to fit images to your theme’s maximum dimensions
- Lazy loading — defers off-screen images with auto-scaling placeholders to prevent layout shift
- PDF compression — compress PDF files in the media library (premium)
- Premium SWIS plugin — included with premium plans, adds page caching, CSS minification, and critical CSS
Key Features
- Local compression engine — uses jpegtran, optipng, pngout, pngquant, and gifsicle for server-side processing
- Cloud compression API — lossless compression via EWWW servers when local tools aren’t available
- Bulk optimizer — optimize all existing media library images, theme images, and user-specified folders
- WebP delivery — convert and serve WebP images via Apache rewrite rules, JavaScript rewriting, or picture tags
- AVIF delivery — convert to AVIF format through the Easy IO CDN for modern browsers
- Auto-upload compression — compress and resize images automatically when uploaded to the media library
- Image Detective — identify improperly scaled images and optimize Largest Contentful Paint (LCP) images
Comparison with Competitors
EWWW Image Optimizer vs Imagify
| Aspect | EWWW Image Optimizer | Imagify |
|---|---|---|
| Free compression | Unlimited (local) | 25 MB/month |
| WebP conversion | Yes | Yes |
| AVIF conversion | Yes (via Easy IO) | No |
| Compression levels | Lossless + premium | Lossy, lossless, ultra |
| CDN | Easy IO (premium) | No |
| PDF compression | Yes (premium) | No |
| Server tools required | Yes (free mode) | No |
Bottom line: Imagify is easier to set up — no server tools required, works on any host. EWWW Image Optimizer offers unlimited free compression and more formats (WebP + AVIF), but requires compatible hosting for local mode.
EWWW Image Optimizer vs Smush Pro
| Aspect | EWWW Image Optimizer | Smush Pro |
|---|---|---|
| Compression limits | Unlimited (free) | Unlimited (WPMU) |
| WebP conversion | Yes (free) | Yes (pro) |
| AVIF conversion | Yes (Easy IO) | No |
| Compression type | Lossless + premium lossy | Lossless only |
| Bulk optimization | Yes | Yes |
| Lazy loading | Yes | Yes |
| CDN | Easy IO | WPMU DEV CDN |
Bottom line: Smush Pro has a simpler setup and integrates with the WPMU DEV suite. EWWW achieves better compression ratios with its premium mode and supports AVIF through Easy IO.
Recommended Stack: EWWW Image Optimizer handles image optimization and CDN. For overall site performance, pair it with WP Rocket to combine image optimization with page caching, minification, and database optimization.
Official Changelog
Data sourced from WordPress.org plugin repository.
Version 8.7.7
Release Date: September 1, 2026
- Fixed: LQIP/DCIP inputs not available immediately after Easy IO activation.
- Security: Ensure all CDN image URLs are properly escaped to prevent XSS.
Version 8.7.6
Release Date: August 20, 2026
- Added: Option to disable client-side media processing in WP 7.1, mostly for animated GIF images and indexed (palette) PNG images.
- Fixed: Compatibility with client-side media processing in WP 7.1.
- Fixed: Easy IO URL modification in REST API endpoints used by media uploader in WP 7.1.
- Fixed: WebP conversion via Imagick throws fatal error when source file goes missing.
- Fixed: PNG to JPG conversion via API sometimes results in black background for 8-bit images.
Version 8.7.5
Release Date: August 5, 2026
- Improved: Use WP file access functions wherever possible.
- Fixed: PHP notices in BuddyPress/BuddyBoss compatibility functions.
- Removed: PNG to JPG auto-convert for large PNG images.
Frequently Asked Questions
Is EWWW Image Optimizer really free?
Yes, the local compression mode is completely free with no limits on image count or size. It uses tools installed on your server to compress images. If your server doesn’t support local tools, EWWW offers a cloud API with generous free usage.
What is Easy IO?
Easy IO is EWWW’s cloud-based CDN and image optimization service. It automatically compresses, resizes, converts to WebP/AVIF, and serves images from a global CDN. Easy IO is a paid add-on but significantly reduces server load and improves page load times.
How does WebP delivery work?
EWWW can deliver WebP images using three methods: Apache rewrite rules that serve WebP files to supported browsers, JavaScript rewriting that replaces img src attributes, or picture tags with <source> elements for each format.
Does EWWW support AVIF?
Yes. AVIF conversion and delivery is supported through the Easy IO CDN. Once enabled, EWWW converts images to AVIF format and serves them to browsers that support the format, with fallback to WebP or JPEG for older browsers.
What is the premium compression?
Premium compression (5x better than lossless) is available through a paid plan starting at $7/month. It includes lossy compression with intelligent quality adjustment, PDF optimization, Easy IO CDN, the SWIS performance plugin, and premium support.
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