WebP vs AVIF — The Battle for the Web's Next Image Format
Compare WebP and AVIF image formats. File sizes, quality, browser support, encoding speed, and which format to use for your website in 2026.
The Two-Format Future
The web image landscape in 2026 is a two-horse race. WebP (Google, 2010) has been the incumbent since Safari finally added support in 2020. AVIF (Alliance for Open Media, 2019) is the challenger — technically superior but still maturing.
Both formats crush JPG and PNG on file size. The question is: which one should you use?
The Numbers
We compressed 200 images (photos, screenshots, graphics) at equivalent visual quality:
| Metric | WebP | AVIF | Winner |
|---|---|---|---|
| Photo file size (vs JPG 85) | 30% smaller | 50% smaller | AVIF |
| Screenshot file size (vs PNG) | 25% smaller | 35% smaller | AVIF |
| Encoding speed | Fast (50ms) | Slow (800ms) | WebP |
| Decoding speed | Fast | Slightly slower | WebP |
| Browser support (2026) | 97%+ | 93%+ | WebP |
| Transparency | Yes | Yes | Tie |
| Animation | Yes | Yes | Tie |
| Max dimensions | 16383 × 16383 | 65536 × 65536 | AVIF |
| Color depth | 8-bit | 8/10/12-bit | AVIF |
| HDR support | No | Yes | AVIF |
When to Use WebP
- Maximum browser compatibility — 97% vs 93% matters for some audiences
- Fast encoding needed — WebP encodes 10-15x faster than AVIF
- Animated images — WebP animation is more widely supported
- CDN/build pipeline — Most CDNs and build tools support WebP auto-conversion; AVIF support is newer
- You're migrating from JPG/PNG — WebP is the safe first step
When to Use AVIF
- Maximum compression — AVIF saves an additional 20-30% vs WebP
- High-quality photography — AVIF handles gradients and complex textures better
- HDR content — AVIF supports HDR; WebP doesn't
- Large hero images — The extra compression pays off most on big images
- Bandwidth-constrained users — Every KB matters on slow connections
The Practical Approach
Serve both with fallbacks:
<picture>
<source srcset="photo.avif" type="image/avif">
<source srcset="photo.webp" type="image/webp">
<img src="photo.jpg" alt="..." loading="lazy">
</picture>Browsers pick the first format they support. Users with AVIF support get the smallest file. Everyone else falls through to WebP, then JPG.
Convert images to both formats with MyPDF's Batch Image Converter.
The Encoding Speed Problem
AVIF's biggest practical drawback: encoding is painfully slow. Compressing a single 4K image can take 2-5 seconds with AVIF vs 50-200ms with WebP. For a site with 10,000 images, that encoding time adds up significantly in build pipelines.
This is improving — hardware-accelerated AV1 encoding is arriving in newer CPUs and GPUs — but in 2026, WebP remains much faster to generate at scale.
My Recommendation
For most websites: Use WebP. It's fast, well-supported, and 30% smaller than JPG. That's good enough for 90% of use cases. For image-heavy sites (photography, e-commerce, media): Use AVIF with WebP fallback. The extra 20% compression savings compound across thousands of images. For everyone: Stop serving plain JPG and PNG. Either modern format is a massive improvement.Related Tools
- Convert Image — Convert to WebP or AVIF
- Compress Image — Optimize image file sizes
- Batch Convert Images — Convert entire folders
- Resize Image — Resize before format conversion