About this plugin
Opti Ninja Image Optimizer helps you optimize and compress WordPress images directly from your Media Library. Reduce image file sizes, convert images to WebP and AVIF, improve page speed, and boost Core Web Vitals without changing image URLs, filenames, alt text, or attachment metadata.
ninja account and optimize JPEG, PNG, WebP, AVIF, and HEIC images individually or in bulk.
Why use Opti Ninja?
- Image optimization for WordPress
- Image compression for JPEG, PNG, WebP, AVIF, and HEIC
- Bulk image optimization for your Media Library
- WebP converter and AVIF converter
- Reduce image file sizes
- Improve page speed and Core Web Vitals
- Automatic image optimization for new uploads
- Background image optimization jobs
- Optional backups with one-click restore
- Preserve image URLs, filenames, alt text, and metadata
Features
- Optimize the full-size image and selected WordPress-generated image size variants
- Bulk image optimization for your entire Media Library with progress tracking, live log, pause, resume, and cancel
- Background image optimization processing — leave the page and optimization continues automatically
- Filter bulk jobs by upload date range, minimum file size, and maximum number of images
- Automatically optimize and compress newly uploaded images in the background, during upload, or manually
- Compress JPEG, PNG, WebP, AVIF, and HEIC images with configurable quality settings
- Convert image formats to WebP, AVIF, HEIC, JPEG, and PNG
- Generate additional output formats alongside the optimized original image
- Progressive JPEG and metadata stripping options
- Choose which image sizes to optimize, including full size, thumbnail, medium, large, and registered theme sizes
- Optional backup of original image files before replacement
- One-click restore of original images
- Display image savings per file, including percentage and file size reduction
- Preserve image URLs, filenames, alt text, titles, and attachment metadata
- Connect using your opti.ninja account credentials or API key
- View token balance, account quota, and optimization capacity estimates
- Optimize images directly from the Media Library list view, grid view, and attachment sidebar
- Reset optimization status metadata without changing optimized files on disk
Supported image formats
JPEG, PNG, WebP, AVIF, and HEIC/HEIF.
Requirements
- WordPress 6.6 or later
- PHP 8.0 or later
- A free or paid opti.ninja account
Token usage
ninja account. That token covers all selected image size variants and any additional output formats generated for that image.
External services
ninja/api/public.
Depending on how you use the plugin, the following data may be sent:
- Image optimization (POST /optimize-sync) — image file data is sent for image compression and optional format conversion. Images are processed on opti.ninja servers and are not stored permanently.
- Account connection (POST /connections/login, POST /connections/api-key, DELETE /connections/) — your opti.ninja credentials or API key, plus basic site metadata such as site name, site URL, WordPress version, and plugin version.
- Quota information (GET /jobs/quota) — retrieves token balance, quota information, and subscription details.
- Token packages (GET /token-packages) — retrieves available token packages for purchase suggestions inside the plugin.
ninja privacy policy and terms of service:
- https://opti.ninja/privacy.html
- https://opti.ninja/terms-of-service.html
Backup folder
When backups are enabled, original image files are moved to:
ninja Backups/
The original uploads folder structure is preserved before optimized files replace the originals.