Free Online WEBP to AVIF Converter
Convert WebP to AVIF format. Free online conversion.
Up to 50 MB per file. Sign up free to convert files up to 100 MB.
| File name | Size | Convert to |
|---|
Checking files and selected output formats.
WebP to AVIF: upgrading to the latest codec
AVIF's AV1 codec achieves 20-30% better compression than WebP's VP8 at equivalent quality. Both are modern formats, but AV1 uses more advanced prediction modes, larger transform blocks (up to 64×64 vs VP8's 16×16), and film grain synthesis that preserves the visual texture of photographs at very low bitrates. The conversion decodes VP8-compressed data and re-encodes with AV1, adding one generation of lossy compression.
Convert WebP to AVIF when squeezing the last percentage of file size reduction from web images. The gains are most noticeable on large hero images and product photography. For small thumbnails and icons, the savings may not justify the slower encoding time and slightly reduced browser support.
WebP vs AVIF: Side-by-side
Technical comparison of the two formats, useful for deciding which to use, or for confirming what changes during conversion.
| Property | WebP | AVIF |
|---|---|---|
| Full name | WebP (Google) | AV1 Image File Format |
| Year introduced | 2010 | 2019 |
| Developer / standard body | Alliance for Open Media | |
| MIME type | image/webp | image/avif |
| File extension | .webp | .avif |
| Compression | Lossy or lossless (VP8/VP8L) | Lossy or lossless (AV1) |
| Color / data depth | 24-bit + 8-bit alpha | 8/10/12-bit |
| Max dimensions / size | 16,383 × 16,383 px | 65,536 × 65,536 px |
| Transparency | Yes | Yes |
| Animation | Yes | Yes |
| Standard / specification | RFC 9649 (lossless), RFC 6386 (VP8) | AOMedia AV1 |
| Best for | Modern web, 25–35% smaller than JPG/PNG at equivalent quality | Next-gen web images, 50% smaller than JPG, 20% smaller than WebP |
Use WebP when
- You want a safe modern format that just works
- Encoding speed matters (large batches, CI pipelines)
- You need the widest possible browser reach
- Your CDN doesn't yet serve AVIF automatically
Use AVIF when
- You need the absolute smallest file size for a critical hero image
- You want HDR delivery on supported browsers
- You control the environment and can require a modern browser
- You're using a CDN that transparently converts and serves the right format
For most sites in 2026, WebP is still the pragmatic default, better encoding speed, universal modern support, still huge savings over JPG. AVIF is worth it for hero images and above-the-fold assets where every kilobyte matters. Modern CDNs (Cloudflare, Fastly) will negotiate the right format per-request, so serving both is often free.