AVIF vs WebP at a glance
Both are modern, royalty-free, broadly supported web formats. AVIF wins on file size; WebP wins on speed and maturity. The rest of this guide unpacks each row.
| Aspect | WebP | AVIF |
|---|---|---|
| Compression | Baseline | 30-50% smaller |
| Browser support (2026) | 97% of browsers | 93% of browsers |
| Encoding speed | Fast, like JPEG | Slow (minutes for a big batch) |
| Color and HDR | 8-bit sRGB | 10-12 bit, HDR, wide gamut |
| Toolchain | Mature (a decade-plus) | Still catching up |
| Best for | Most sites, fast pipelines | Max compression, build-time |
Where they come from
WebP was developed by Google and released in 2010. Its lossy mode is based on the VP8 video codec. Its lossless mode uses a separate algorithm tuned for pixel-accurate compression. WebP has been supported in Chrome since 2011 and gained Safari support in version 14 (2020), which brought it to broad deployment across the major browsers.
AVIF (AV1 Image File Format) is derived from the AV1 video codec, which was developed by the Alliance for Open Media — a consortium that includes Google, Apple, Amazon, Netflix, Microsoft, Mozilla, and Intel. AV1 was designed as a royalty-free successor to HEVC. AVIF builds on this by using AV1 intra-frame encoding for still images. Chrome added AVIF support in 2020, Firefox in 2021, and Safari in 2022 (version 16).
Compression efficiency
AVIF consistently produces smaller files than WebP at equivalent visual quality across most content types. The typical advantage is 30–50% smaller files compared to WebP, and 50–60% smaller compared to JPEG.
The gap is largest for photographic content with smooth gradients and wide tonal ranges. It narrows for highly textured content, small images, and simple graphics. For lossless content (pixel-accurate reproduction), AVIF and lossless WebP are closer in size, with neither consistently winning.
Browser support in 2026
Both formats have broad browser support, but the coverage is not identical. The ~4% gap below matters most for enterprise environments with controlled browser versions, older iOS devices on iOS 15 or earlier, and some embedded or in-app browsers. For general public-facing websites, both formats are viable without fallbacks. For maximum safety, use the
- WebP: Chrome, Firefox, Safari 14+, Edge, Opera, and all modern mobile browsers. Coverage is approximately 97% of global browser usage.
- AVIF: Chrome 85+, Firefox 93+, Safari 16+, Edge 121+. Coverage is approximately 93% of global browser usage as of 2026.
Encoding speed
This is the most significant practical difference between the two formats. WebP encoding is fast — comparable to or slightly slower than JPEG encoding. For a batch of 100 high-resolution photographs, WebP encoding might take 10–30 seconds. AVIF encoding is slow: the same batch can take 5–20 minutes depending on the encoder, quality settings, and image complexity. Faster AVIF encoders exist (like the cavif encoder with speed presets) but produce slightly larger files — the trade-off between encoding speed and compression efficiency is tunable but not free. The slow encoding matters in two scenarios:
- Build pipelines: A site with hundreds of images encoded at build time will have measurably longer build times with AVIF.
- On-the-fly encoding: Server-side real-time AVIF encoding for user uploads or dynamic image resizing adds significant latency and CPU cost.
Advanced capabilities
AVIF supports several capabilities that WebP does not. For most web images displayed on standard sRGB monitors these do not matter; they become relevant for professional photography, HDR content delivery, and high-end display targets.
- HDR and wide color gamut (WCG): AVIF can represent colors beyond the sRGB space and HDR luminance ranges. WebP is limited to sRGB.
- High bit depth: AVIF supports 10-bit and 12-bit per channel images. WebP is 8-bit per channel.
- Film grain synthesis: AVIF can encode grain parameters separately from image content, allowing high-fidelity grain reproduction at lower file sizes.
Toolchain maturity
WebP has had over a decade to mature in tooling. Photoshop, Figma, Sketch, Lightroom, most image editing libraries, CDNs, and build tools have WebP support. Export workflows are well-established.
AVIF toolchain support is still catching up. Many image editors added AVIF support in 2022–2024. Some older plugins, hosting platforms, and image optimization services have limited or no AVIF output capability. Verify your specific tools before committing to AVIF as a primary format.
Which to choose
For most web projects in 2026, WebP is the pragmatic choice. AVIF is the optimal choice when you can invest in the pipeline to support it.
Choose WebP when
- You need a single format that covers most use cases without fallbacks
- Encoding speed or real-time processing matters
- Your toolchain has limited AVIF support
- The marginal file size improvement over WebP does not justify the added pipeline complexity
Choose AVIF (with WebP or JPEG fallback) when
- File size is the primary optimization target (high-traffic, media-heavy sites)
- You encode images at build time and can absorb the slower encoding
- Your audience is primarily on modern browsers where AVIF support is high
- You need HDR or wide color gamut support