Solution
Convert images to AVIF locally in your browser
AVIF is the next-generation image format backed by the Alliance for Open Media. It achieves 30–50% better compression than JPEG at comparable visual quality and often outperforms WebP.
ConV encodes AVIF files using libavif compiled to WebAssembly, running directly in your browser tab. Encoding is CPU-intensive — multiple Web Workers keep the UI responsive.
Because nothing leaves your device, converting sensitive images or unreleased product shots is straightforward.
Key benefits
- AVIF encoding in your browser — no server required
- libavif WASM: same codec as production transcoding servers
- Better compression than WebP for photos and illustrations
- Parallel encoding with Web Workers keeps the UI smooth
Common use cases
- Performance engineers targeting top Core Web Vitals scores
- Media teams converting large photo libraries
- E-commerce teams preparing next-gen product images
- Developers building performance-critical web applications
How it works
- 01
Drop JPEG, PNG, or WebP files
- 02
Select AVIF as output format
- 03
Set quality — lower = smaller file; higher = better detail
- 04
Workers encode in parallel; download ZIP when complete
Limitations and realistic expectations
AVIF encoding is slow on low-spec devices. Safari 16+ and all modern Chromium/Firefox versions support AVIF. For older browser support, provide WebP or JPEG fallbacks.
Frequently asked questions
Is AVIF better than WebP for all images?
AVIF generally achieves better compression than WebP, especially for photographic content. For graphics with flat colors, both perform similarly.
Which browsers support AVIF?
Chrome, Firefox, Edge, and Safari 16+ support AVIF. For broader compatibility, serve WebP to older browsers.
Can I convert AVIF back to JPEG?
Yes. Select JPEG as your output format to decode AVIF back to standard JPEG.
How long does AVIF encoding take?
Expect 5–15 seconds per standard web image (1–3 MP) on a modern laptop. High-resolution photos or large batches take longer.
Related solutions
Convert images to WebP without uploading them
WebP is the de-facto standard for web images. Converting to it typically reduces file size by 25–35% compared to JPEG, improving page speed and Core Web Vitals without loss of quality.
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.
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.