The short answer
In 2026, WebP is the safe default and AVIF is the compression champion — though its slower encoding time means it isn't worth using in every environment. For most websites the best solution is an AVIF + WebP + JPG fallback combination, using the <picture> element.
Compression ratio
At comparable visual quality:
| Format | Size relative to JPG |
|---|---|
| JPG (baseline) | 100% |
| WebP (lossy) | approx. 70–75% |
| AVIF | approx. 50–60% |
So AVIF can be 20–30% smaller than WebP — especially for photos and high-resolution images. For graphics and logos the difference is smaller.
Browser support (2026)
- AVIF: Chrome, Edge, Firefox, Opera, Safari 16.4+ — practically every modern browser. Older Safari versions (14–16.2) and Internet Explorer don't support it.
- WebP: every modern browser, and even some early-2010s IE versions.
Both are safe to use today — the only realistic risk with AVIF comes from very old iOS versions.
Encoding speed
This is AVIF's weak spot: encoding takes up to 3–5 times longer than WebP. For static sites (images generated at build time) this isn't a problem; for dynamic systems based on user uploads (e.g. photo galleries) you must account for it, since server load is higher too.
Which one for which scenario?
| Scenario | Recommendation |
|---|---|
| Photos, galleries, hero images | AVIF primarily, WebP as fallback |
| Logos, icons, UI graphics | WebP (or SVG, if vector) |
| Email attachments, SMS, older forms | JPG — compatibility matters most here |
| Supporting old browsers | WebP, with AVIF only as an extra |
| Server-side resource limits (e.g. lots of user uploads) | WebP — faster to encode |
How to implement it on your site
<picture>
<source srcset="hero.avif" type="image/avif" />
<source srcset="hero.webp" type="image/webp" />
<img src="hero.jpg" alt="Description" width="1200" height="630" />
</picture>With the <picture> element the browser picks the best format for itself — but it's still worth keeping the JPG version as a final fallback.
Conversion: how do you convert your JPGs?
Image Converter offers free, serverless (in-browser) conversion:
- AVIF to JPG — when you need to open an AVIF file in software that doesn't support it yet.
- WebP to JPG — the classic compatibility fix.
- AVIF to WebP — when you have an AVIF file but must serve WebP.
Because conversion happens right in the browser, your images are never uploaded to any external server — which matters greatly for privacy, for example with client photos.
FAQ
Can AVIF be lossless too?
Yes: AVIF supports both lossy and lossless modes, and even offers 12-bit color depth. WebP's lossy compression uses an older, VP8-based algorithm.
Banding in dark colors?
AVIF handles dark gradients better, so banding is less noticeable. If you're seeing it in your current images, try converting JPG to AVIF.
Do WebP/AVIF require a CDN or caching?
Modern CDNs handle these automatically, but it's worth setting a long TTL on the Cache-Control header for converted assets.