# Convert Your Images to AVIF > Serve the smallest next-gen format with AVIF conversion for WordPress. Single-convert and on-upload free; bulk AVIF in Pro. Faster loads, better SEO. - Canonical URL: - Markdown URL: Category: Speed feature AVIF is the smallest next-gen format - roughly 50% smaller than JPEG and about 20% smaller than WebP. Single-image convert and auto-convert on upload are free; full-library bulk conversion is in Pro. ## Even WebP Is Leaving Bytes on the Table If speed is the goal, AVIF squeezes your images further than any format before it. ### Images Still Too Heavy You converted to WebP and pages got faster - but AVIF goes further, shaving off roughly another 20% at the same visual quality. That's weight your visitors are still downloading. Impact: AVIF is ~50% smaller than JPEG ### Speed Scores Plateau Once the easy wins are gone, the last stretch of Core Web Vitals is the hardest. Serving the smallest possible format is one of the few levers left to pull. Impact: ~20% smaller than WebP, at equal quality ### AVIF Locked Behind Cloud Credits Most plugins gate AVIF behind metered cloud plans that charge per image or per month. Convert enough and the "next-gen" upgrade turns into a recurring bill. Impact: No per-image fees, runs on your server ## How AVIF Conversion Works The same safe, in-place conversion as WebP - now in the smallest format available. ### Steps 1. **Convert** — ThumbPress writes a smaller AVIF version first, raising the memory limit and pre-flighting available RAM so large images convert safely. 2. **Rewrite** — It rewrites stored URLs across post content, meta and options - including WooCommerce - so every reference points at the new AVIF file. 3. **Replace** — The old file is deleted only after the new one is safely written, so a failed conversion can never leave you with a broken image. ### 3 Ways to Convert AVIF is ~50% smaller than JPEG #### Bulk conversion Convert your entire library to AVIF in one background job with format selection, live progress and cancel. Bulk and background AVIF conversion is a Pro feature. #### Single image A one-click AVIF button in the media library - free - so you can convert or test any image on demand. #### Auto-convert on upload Switch it on and every new image is converted to AVIF automatically as it's uploaded, at no cost. ## Compress with Confidence The smallest format, converted safely, entirely on your own server. - AVIF is ~50% smaller than JPEG - Single-convert and on-upload are free - Bulk and background conversion in Pro - Requires PHP 8.0 or newer for AVIF - Auto-rewrites URLs so links never break - Old file removed only after new one is written ## Frequently Asked Questions ### Is AVIF better than WebP? For file size, yes - AVIF is typically about 20% smaller than WebP and around 50% smaller than JPEG at comparable quality, which makes it the leanest option for speed. ### What do I get for free versus in Pro? Single-image conversion from the media library and auto-convert on upload are both free. Bulk and background conversion of your whole library - with format selection, progress and cancel - is a Pro feature. ### Does AVIF work in WordPress? Yes, as long as your server runs PHP 8.0 or newer, which AVIF encoding requires. ThumbPress checks this and converts safely in place. ### Which browsers support AVIF? AVIF is supported by current versions of Chrome, Firefox, Edge and Safari, with adoption continuing to grow across the web. ### Will converting break my image URLs? No. After each conversion ThumbPress rewrites the stored URLs across post content, meta and options - including WooCommerce - and only deletes the old file once the new one is safely written. ### What happens if my server still runs PHP 7? AVIF conversion is skipped rather than attempted, because the encoder only exists from PHP 8.0 onward. Everything else in ThumbPress keeps working, and WebP conversion is a good stand-in until you can upgrade. ### Can I convert my existing WebP images to AVIF? Yes. WebP is one of the source formats you can select, alongside JPEG and PNG, so a library already converted to WebP can be taken one step further. ### Are my images sent to a cloud service to be converted? No. AVIF encoding runs on your own server using PHP's image libraries. There are no API keys, no per-image credits and no images leaving your hosting. ### Should I use AVIF instead of WebP, or both? AVIF gives the smallest files, but WebP has been supported for longer and encodes faster. If you want maximum compatibility with older browsers, WebP is the safer default; if size is what matters most, go AVIF. ## Ready for the Smallest Format? Get started today. Love it or get a refund within 30 days. ## About ThumbPress ThumbPress is a WordPress plugin for image optimization and thumbnail management, built by Codexpert. It runs on your own server: compression, WebP/AVIF conversion and cleanup all happen locally, with no third-party image API and no per-image credits. - All features: - Pricing: - Documentation: - Blog: - Support: - WordPress.org listing: