WebP vs AVIF: The Modern Web Codec Battle
Both compress better than JPG. AVIF is smaller for photos, WebP is supported more widely. Learn which modern codec fits your site.
Compare the two leading modern codecs: AVIF compresses photos more, WebP is supported by more software. Serve AVIF where modern browsers dominate, WebP for the safest upgrade from JPG.
How it works
The short answer
AVIF compresses photos 20 to 50 percent smaller than WebP at equal quality, making it the most efficient format on the web today. WebP is supported everywhere modern, with mature tooling and a smaller compatibility gap. The practical answer is AVIF for photo heavy modern sites, WebP as the dependable middle ground.
How WebP compares
WebP is built on VP8 video compression and has been shipping in browsers since 2011. It offers lossy and lossless modes, transparency and animation, with broad support in editors and content management systems. Its quality at low file sizes is good but not the best available.
How AVIF compares
AVIF is built on the AV1 video codec, which was designed for high efficiency streaming. That heritage lets it encode still images with the best compression per byte today. It supports lossy and lossless modes, transparency and animation, and is smaller than WebP for photographic content.
File size difference
For the same photo at the same visual quality, AVIF is typically 20 to 50 percent smaller than WebP, and both are far smaller than JPG. The gap is largest for detailed photographs and gradients. On image heavy pages, switching from WebP to AVIF can trim a meaningful share of total weight.
Compatibility
WebP works in every modern browser and most tools, making it the safer broad deployment. AVIF is supported by all modern browsers but still missing from some older ones, certain editors and some content platforms. Check your audience before choosing AVIF as the primary format.
Encoding cost
AVIF encoding is slower than WebP because AV1 compression is computationally heavy. For a single photo the difference is seconds; for thousands of images it can matter at build time. WebP encodes faster, which suits large batch conversions on modest hardware.
A practical rule
Serve AVIF for modern browsers with a WebP or JPG fallback for the rest. If you can only pick one, WebP is the safer broad choice and AVIF the higher compression choice. Convert between the two formats on this site to compare file sizes before you commit.
Format comparison
| Format | Compression | Transparency | Browser support | Best for |
|---|---|---|---|---|
| WebP.webp | Lossy (discards some detail) | Yes | All modern browsers (2011+) | Web images that need both quality and small file size |
| AVIF.avif | Lossy (discards some detail) | Yes | All modern browsers (2020+) | Modern web photos with the best compression at high quality |
Frequently asked questions
Is AVIF the future of web images?
AVIF offers the best compression today, but WebP remains the safest compatibility choice. AVIF is likely to grow as encoding tools and support mature.
How much smaller is AVIF than WebP?
For the same photo at similar quality, AVIF is typically 20 to 50 percent smaller than WebP, with the biggest gains on detailed photographs.
Is AVIF supported in all browsers?
All modern browsers support AVIF, including Chrome, Edge, Firefox and Safari. Older browser versions and some tools still do not.
Can AVIF do everything WebP can?
Yes, AVIF supports lossy and lossless modes, transparency and animation, matching WebP feature for feature while compressing more.
Should I switch my site from WebP to AVIF?
If your visitors use modern browsers, AVIF cuts file size further. Use a fallback so older clients still load WebP or JPG.