WebPressor – WebP & AVIF Image Converter, Optimizer & Compressor

FAQ

Does WebPressor replace or delete my original images?

No. WebPressor never modifies or deletes your original JPEG and PNG files. It generates separate .webp and .avif versions alongside the originals and serves them conditionally based on what the visitor’s browser supports. You can reset and delete all generated files at any time from the Dashboard.

What image formats does WebPressor convert?

WebPressor converts JPEG (.jpg, .jpeg) and PNG (.png) images. It converts the full-size original plus all registered WordPress thumbnail sizes (such as thumbnail, medium, large, medium_large, and custom theme sizes).

Do I need to configure anything to get started?

No! Simply install and activate the plugin, go to WebPressor → Dashboard, and click Start Optimization. The defaults are pre-configured for the best balance of quality and file size savings.

What PHP version and server extensions are required?

• PHP 7.0+ is required for WebP support via GD
• PHP 8.1+ with GD compiled with AVIF support is required for AVIF conversion
• You can check your server’s capabilities on the System Status tab

What is the difference between WebP and AVIF?

WebP is Google’s image format offering 25–35% smaller files than JPEG and is supported by 97%+ of browsers. AVIF is a newer AV1-based format offering 40–50% smaller files than JPEG and is supported by 80%+ of modern browsers. WebPressor automatically serves AVIF to browsers that support it, falls back to WebP for others, and falls back to the original image for legacy browsers.

Will this plugin affect my site’s SEO?

Positively! Faster page loads from smaller images directly improve your Core Web Vitals scores (LCP in particular), which are a ranking factor in Google’s algorithm. WebPressor also passes Google’s PageSpeed Insights “Serve images in next-gen formats” audit.

What is the difference between HTML Alteration and Server Rewrite Rules?

HTML Alteration modifies image URLs inside page HTML content on-the-fly using PHP. It works everywhere but only affects images in page content and widget text.

Server Rewrite Rules add Apache/LiteSpeed .htaccess directives that intercept image requests at the server level before PHP even runs. This method also handles background CSS images, JavaScript-loaded images, and slider images — making it more thorough and slightly faster.

Does the plugin work with WooCommerce product images?

Yes! WebPressor converts all registered WordPress image sizes, including WooCommerce product thumbnails, gallery images, and the woocommerce_thumbnail size. All image sizes are optimized during bulk conversion.

Does it work with page builders like Elementor, Divi, or Gutenberg?

Yes. WebPressor is fully compatible with Elementor, Divi, Avada, Beaver Builder, the WordPress block editor (Gutenberg), and all other major page builders. When using the HTML delivery method, all images in content areas are replaced. For background images set through page builders, the Server Rewrite Rules delivery method is recommended.

What happens to images already uploaded before I installed WebPressor?

Use the Bulk Optimizer on the Dashboard to process your entire existing Media Library. The plugin will convert all previously uploaded images in batches and display real-time progress and savings in the live console log.

How do I convert newly uploaded images automatically?

Enable the “Automatically convert images on upload” option in the Settings tab. When enabled, any new image uploaded to the Media Library will be automatically converted in the background.

Can I control the compression quality?

Yes. The Settings tab provides independent quality sliders for WebP (recommended: 75–85) and AVIF (recommended: 60–70). You can also choose between Lossy mode (recommended for maximum size savings) and Lossless mode (100% quality, larger files).

Can I undo the conversions and restore my original images?

Yes. Click the Reset Conversions button on the Dashboard. This will delete all generated .webp and .avif files and reset the statistics, leaving your original images completely intact.

Will the plugin slow down my WordPress admin?

No. Bulk conversion uses AJAX-based batch processing that runs in the background without blocking your admin interface. You can continue using WordPress normally while the optimizer runs.

Is WebPressor compatible with WordPress Multisite?

Yes, WebPressor is compatible with WordPress Multisite installations.

Does WebPressor work with CDN or object storage?

WebPressor converts images stored in the local filesystem (/wp-content/uploads/). If you use a CDN, the CDN will automatically serve the WebP/AVIF files once they have been generated and your CDN is configured to cache those file types. If images are stored externally (e.g., Amazon S3 via a cloud offload plugin), local conversion may not be possible — CDN-level WebP conversion would be needed instead.

Does WebPressor work with caching plugins?

Yes. WebPressor is compatible with WP Rocket, W3 Total Cache, WP Super Cache, LiteSpeed Cache, Autoptimize, and other popular caching plugins. After running the bulk optimizer, clear your cache to ensure visitors receive the new optimized images.

What happens if a visitor’s browser does not support WebP or AVIF?

WebPressor detects browser support using the HTTP Accept request header. Browsers that do not declare support for image/avif or image/webp will receive the original JPEG or PNG image automatically — there is zero impact on compatibility.