Comprehensive image optimization with WebP, AVIF, Lazy Load, and more. Optimize images automatically for Faste...
Free
1M+ installs 4.8★ (1,838)
CompressX
AVIF & WebP converter with built-in media replacement for local image optimization.
The facts
- Rating
- 5★ from 191
- Active installs
- 40k+
- Price
- Free
- Last updated
- 29 Jul 2026
- Added
- Jun 2024
- Requires WP
- 5.8
- Tested up to
- WP 7.0.4
- Requires PHP
- 7.0
- Downloads
- 332,954
Our analysis
AI-assistedCompressX is a free WordPress plugin that enables the conversion of JPG and PNG images to WebP and AVIF formats, along with media replacement capabilities. It performs all conversions and compressions locally on your web server, ensuring that URLs and attachment IDs remain unchanged when replacing media files.
The plugin includes features such as automatic processing of new images, exclusion of specific folders from processing, and the ability to compress existing AVIF and WebP images. It is suitable for users looking to optimise their website's images for better performance and speed.
Best for: This plugin is best for WordPress users seeking to optimise their images for improved site performance.
What it does well
- ✓Converts JPG and PNG images to WebP and AVIF formats
- ✓Compresses images according to user-defined levels
- ✓Allows safe media replacement without URL changes
- ✓Includes options to exclude specific folders from processing
- ✓Automatically processes new images upon upload
Where it falls short
- •No information on support or documentation
- •Limited to image formats specified in the description
Verdict
CompressX offers practical features for image conversion and optimisation, making it a useful tool for those focused on enhancing website speed and performance.
From the developer
CompressX's own description of CompressX, lightly tidied.
CompressX is a free, lightweight WebP & AVIF conversion and media replacement plugin for WordPress. It allows you to easily convert JPG and PNG images to WebP and AVIF formats, compress WebP and AVIF images, and replace media files without changing their URLs or attachment IDs. All AVIF and WebP conversions are performed locally on your web server.
Core Features
1. Convert AVIF & Compress AVIF
Convert jpg, png, and WebP images on your WordPress website to AVIF format, and compress AVIF images according to the compression level you set.
If the original image is already in AVIF format which is supported since WordPress 6.5, the original AVIF image will only be compressed.
2. Convert WebP & Compress WebP
Convert jpg, png images on your WordPress website to WebP format, and compress WebP images according to the compression level you set.
If the original image is already in WebP format which is supported since WordPress 5.8, the original WebP image will only be compressed.
3. Media Replacement & Auto Re-Optimization
Safely replace an existing media file without changing its URL or attachment ID. When a new image is uploaded as a replacement, the system automatically regenerates thumbnails, applies your configured format conversion and compression rules, resizes where needed, and re-optimizes the file.
4. Exclude Folders
Select specific folders in your media library and prevent images inside them from being processed.
5. Custom Folders
Select folders that are in the wp-content folder but outside the Uploads (media library) and process images inside them.
6. Auto-Process New Images
Automatically convert new images uploaded to a WordPress website to WebP/AVIF format and compress WebP/AVIF images upon upload.
7. Auto-Remove Large Images
Automatically remove converted AVIF/WebP images when they are larger than original images.
Tagged as
topic
Performance & Speed
Converter
Local
Compress
Convert
Folders
Media Library
Compression
Service
platform
Cloudflare
quality
Conversions
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