Solution
Create AVIF — in your own browser, the privacy-friendly way
AVIF often saves even more bytes than WebP. Encoding is CPU-heavy — ConV uses Web Workers to keep the UI responsive while encoding runs in parallel.
Because nothing is uploaded, data-processing agreements with end clients stay simpler: image data never leaves the legal sphere of your device.
Use AVIF for photos, illustrations, and UI assets where maximum compression matters.
Key benefits
- AVIF typically achieves 30–50% smaller files than JPEG at similar quality
- Uses libavif compiled to WebAssembly — same encoder as popular server-side tools
- Parallel encoding with Web Workers keeps the UI responsive
- No cloud processing, no upload, no data center
Common use cases
- Performance-focused developers reducing image payload for Core Web Vitals
- Media teams converting large photo archives
- Agencies preparing high-quality assets for client handoff
- E-commerce teams optimizing product images for page speed
How it works
- 01
Drop JPEG, PNG, or WebP files
- 02
Select AVIF as output format
- 03
Web Workers encode using libavif WASM in parallel
- 04
Download as individual files or a ZIP
Limitations and realistic expectations
AVIF encoding is computationally intensive. Large batches on lower-spec devices may take longer. Browser support is broad for modern browsers (Chrome, Firefox, Safari).
Frequently asked questions
Is AVIF better than WebP?
AVIF typically achieves better compression at equivalent visual quality. It has broad modern browser support. Use WebP as a fallback for older browsers.
Are my images uploaded during AVIF conversion?
No. Encoding runs entirely in your browser using WebAssembly. No image data is sent to any server.
How long does AVIF encoding take?
AVIF encoding is CPU-intensive. A batch of 10 JPEG photos typically takes 15–60 seconds depending on resolution and device performance.
Which browsers support AVIF?
Chrome, Firefox, Safari 16+, and Edge all support AVIF. For broader compatibility, also provide WebP or JPEG fallbacks.
Related solutions
Convert to WebP — completely without an upload
WebP delivers strong compression for photos and UI graphics. ConV builds WebP files locally using WebAssembly codecs, parallelized across Web Workers.
Compress multiple images locally and export them as ZIP
Processing images one at a time is impractical for agencies, content teams, and e-commerce workflows. ConV's batch mode handles dozens of images in a single session with parallel encoding and ZIP export.
Optimize images for Core Web Vitals without cloud uploads
Images are the largest contributor to Largest Contentful Paint (LCP) — the most impactful Core Web Vitals metric. Reducing image file size and using modern formats (WebP, AVIF) is the most effective single optimization for most pages.