AVIF vs WebP: Which Format Is Better for Your Website?
AVIF and WebP are the two best modern image formats. A direct comparison of file size, quality, browser support, and when to use each.
Both AVIF and WebP are modern image formats that dramatically outperform JPG. But they have different strengths, weaknesses, and compatibility profiles. Here is a definitive comparison.
File Size: AVIF Wins
At equivalent visual quality, AVIF files are typically 20–30% smaller than WebP files and 50% smaller than JPG. For a website with high image volume, this difference is significant — it directly affects page load speed and Google PageSpeed scores.
Browser Support: WebP Leads Slightly
- WebP: ~97% global browser support in 2026
- AVIF: ~92% global browser support in 2026
- For most websites, both are safe to use with a JPG fallback.
Encoding Speed: WebP Wins
WebP encodes significantly faster than AVIF. For real-time image processing, WebP is the practical choice. AVIF encoding can be 10–100× slower than WebP at the same quality settings.
Quality at Extreme Compression: AVIF Wins
At very small file sizes, AVIF degrades more gracefully than WebP. AVIF tends to produce a slightly blurry result at low bitrates, while WebP shows more obvious blocking artefacts. For heavily compressed thumbnails, AVIF looks better.
Feature Comparison
| Feature | AVIF | WebP |
|---|---|---|
| Transparency | Yes | Yes |
| Animation | Yes | Yes |
| HDR | Yes | Partial |
| File size vs JPG | ~50% | ~70% |
| Encoding speed | Slow | Fast |
Recommendation
- New website build in 2026: Use AVIF as primary with WebP fallback and JPG last resort
- Existing site quick optimisation: Switch JPG → WebP — wide support, fast encoding, major improvement
- Email images: Use JPG — neither AVIF nor WebP is reliably supported in email clients
- Convert to WebP for the quickest, widest-impact web improvement.
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