AVIF vs WebP: Which Modern Image Format to Use
13 June 2026
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Short version: for hero images, photography, and anything where bytes on the wire decide your page weight, AVIF usually produces the smaller file, commonly 20-30% under WebP at matched quality, and more on gradients and low bitrates. For UI assets, build pipelines that run on every commit, and the last sliver of legacy reach, WebP is the faster, calmer choice. If you can serve both, do: AVIF first, WebP as fallback, JPEG or PNG underneath. The rest of this page is the why, with numbers and the edge cases that actually bite.
The comparison at a glance
| Dimension | AVIF | WebP |
|---|---|---|
| Compression (photographic) | Best of the two; commonly 20-30% smaller than WebP at matched SSIM/VMAF, more on gradients | Strong vs JPEG (~25-35% smaller), trails AVIF on detailed photos |
| Low-bitrate quality | Holds up well; fewer ringing and blocking artifacts as you starve the file | Decent, but blurs and blocks sooner near the bottom of the range |
| Encode speed | Slow by default; high-effort settings can take minutes on large images | Fast, often several times quicker at comparable settings |
| Decode speed | Heavier (AV1 intra decode) | Light; very mature decoders |
| Lossless mode | Supported, but PNG or WebP-lossless is often competitive | Excellent; frequently beats PNG |
| Transparency (alpha) | Yes | Yes |
| Animation | Yes (AV1 sequences); not its strong suit | Yes; mature, common GIF replacement |
| Color depth | 8/10/12-bit | 8-bit only |
| HDR / wide gamut | Yes: 10-bit, PQ/HLG, Rec. 2020 / P3 | No; 8-bit sRGB only |
| Max dimensions | Very large, subject to per-decoder tile and size limits | Hard cap of 16,383 x 16,383 px |
| Browser support | All current major browsers; roughly mid-90s percent global | Effectively universal in current browsers |
Treat the last two rows as directional. Coverage shifts release to release, so check caniuse.com against your own analytics before you rely on either format alone.
Where AVIF genuinely pulls ahead
AVIF is a still-image container built on AV1’s intra-frame coding, and that lineage shows. On the images people actually publish, such as landscapes, product shots, faces, and skin texture, it reconstructs detail with fewer of the tell-tale artifacts older codecs leave behind. AV1’s block partitioning is simply better at spending a tight bitrate where the eye looks.
A repeatable test you can run yourself: take a 12-megapixel JPEG straight off a phone, around 4 MB, and re-encode it for “good enough for web” hero use.
- JPEG at quality ~80: roughly 900 KB to 1.1 MB
- WebP at quality ~78: roughly 600 to 750 KB
- AVIF at comparable perceptual quality: roughly 350 to 500 KB
Content and encoder settings move those numbers, but the ordering is consistent. The gap widens on two things WebP handles poorly: smooth gradients (skies, soft studio backgrounds), where WebP tends to band, and very low bitrates, where you are deliberately starving the file. Near the bottom of the quality range an AVIF can stay usable while the equivalent WebP turns to mush. If your Largest Contentful Paint is a hero photo, AVIF is the single biggest lever you have on file size without dropping resolution.
The 10-bit and HDR story is the other real differentiator, and here it is not a contest. WebP is 8-bit sRGB, full stop. AVIF carries 10/12-bit depth, Rec. 2020 and P3 primaries, and PQ/HLG transfer. If you deliver HDR photography or wide-gamut artwork to displays that can show it, AVIF is the only one of the two in the running.
Why WebP is still the right default for a lot of work
The headline cost of AVIF is encode time, and it is not a rounding error. At high effort settings the encoder trades a lot of CPU for the last few percent of savings. A batch WebP finishes in seconds can take AVIF minutes. On a CI pipeline that regenerates assets every push, or a CMS that encodes on upload while a person waits, that latency is a product decision, not a footnote. You can dial AVIF effort down to encode faster, but you hand back much of the compression edge that justified picking it.
WebP’s other quiet strengths:
- Predictability. Mature encoders, well-understood quality curves, fewer surprises across tools.
- Lossless and small graphics. For logos, icons, screenshots, and flat UI art, WebP lossless is genuinely good and often beats PNG outright. AVIF can do lossless but rarely wins here.
- Light decode. Decoding is cheap on low-end devices, where AV1 intra decode costs more.
- A generous ceiling, with a hard edge. 16,383 px on a side covers normal work easily, but it is a real cap. Panoramas and large scans can hit it, and that is exactly where AVIF has more room (still subject to per-decoder limits).
For most product UIs, marketing pages with modest imagery, and anything where build or upload latency matters more than shaving another fraction off already-small files, WebP is the choice that does not generate a support ticket. If you are moving off PNG or JPEG today and want one format, Convert to WebP is the low-drama upgrade.
A framework: pick by the constraint that dominates
- Bytes are the bottleneck (LCP, mobile data, image-heavy galleries): AVIF first. The win is real and feeds straight into Core Web Vitals.
- HDR or wide-gamut / 10-bit content: AVIF, no contest. WebP cannot represent it.
- Encode on a hot path (synchronous upload, per-commit CI, anything a human waits on): WebP, or AVIF only at a low effort setting you have actually benchmarked.
- Small UI graphics, icons, flat art, lossless needs: WebP lossless, or keep PNG/SVG. Neither codec’s lossy mode is the point here.
- Animation replacing GIF: WebP is the well-trodden path; AVIF works but is less battle-tested for sequences. Better still, for anything longer than a couple of seconds use a real video (
<video>with muted autoplay), since both image formats are inefficient for long animation. - One format, broadest reach, least fuss: WebP.
The fallback pattern (use both)
You do not have to choose globally. The browser takes the first source it understands, so serve AVIF with graceful degradation:
<picture>
<source srcset="hero.avif" type="image/avif">
<source srcset="hero.webp" type="image/webp">
<img src="hero.jpg" alt="Product on a desk" width="1600" height="900">
</picture>Order matters: list the smallest, most-preferred format first. The <img> is the universal floor, so always include it and always set width and height to reserve layout space and avoid shift. For responsive delivery, add srcset and sizes to each <source>.
If maintaining three encodings of everything is too much, two middle grounds hold up: ship AVIF + JPEG and skip WebP, since current browsers lacking AVIF are rare and JPEG covers them; or ship WebP + JPEG and skip AVIF if your pipeline cannot absorb the encode cost. Both are defensible. The full three-format ladder is the maximalist option for sites where every kilobyte and every old client counts.
One generation rule that saves grief: encode AVIF and WebP from the same lossless or high-quality master, never by recompressing one lossy file into another. Chaining lossy codecs compounds artifacts.
The honest bottom line
AVIF is the better codec; WebP is often the better default. If you are optimizing photographs and large heroes and you have somewhere to absorb the encode cost, whether a background job, a build step, or a CDN that transforms on the fly, AVIF makes pages lighter and gradients cleaner, and it is the only path to HDR. If you want a fast, predictable, universally decoded format for mixed UI and content with minimal operational overhead, WebP stays an easy yes. And since the <picture> fallback costs nothing at runtime, the most defensible answer for a serious site is the unglamorous one: serve both, AVIF first, and verify support for your specific audience before you lean on any single format.