WebP vs AVIF compression.
WebP and AVIF are the two leading next-generation image formats designed to replace JPEG and PNG. Both offer dramatic file size savings over legacy formats — but they excel in different scenarios. Here is how they compare.
Quick comparison
| Feature | WebP | AVIF |
|---|---|---|
| Compression type | Lossy (VP8) and lossless | Lossy (AV1) and lossless |
| File size vs JPEG | 25-35% smaller than JPEG | 50-60% smaller than JPEG |
| Browser support | ~97% (Chrome, Firefox, Safari, Edge) | ~80% (Chrome, Firefox, Safari 16+) |
| Transparency | Lossy and lossless alpha | Full alpha with better compression |
| Animation | Animated WebP supported | Animated AVIF supported |
| Colour depth (HDR) | 8-bit only (no HDR) | Up to 12-bit, HDR, BT.2020 |
| Encoding speed | Fast (5-10x faster than AVIF) | Slow (computationally expensive) |
| Decoding speed | Very fast (hardware decoders) | Fast (growing hardware support) |
| Best for | Web use, real-time encoding, broad compat | Maximum compression, HDR images, archival |
When to use WebP
WebP is the practical choice for most websites today. Developed by Google, it uses the VP8 video codec's intra-frame compression to deliver files 25-35% smaller than JPEG at the same visual quality while supporting transparency and animation. With 97% browser support, WebP is a drop-in replacement for JPEG and PNG on the modern web — no fallback required. Its fast encoding speed makes it ideal for real-time compression of user-uploaded images, where waiting even a few extra seconds per image would harm the user experience.
WebP offers both lossy and lossless modes. Lossy WebP excels at photographs, compressing smooth gradients and textures almost as efficiently as JPEG but with noticeably less banding at low bit rates. Lossless WebP is ideal for screenshots and UI elements, producing files that are 20-40% smaller than PNG with identical pixel data. Use our WebP compressor to optimise your WebP images with custom quality settings and metadata stripping. For processing entire image libraries, the bulk compressor handles hundreds of WebP conversions simultaneously.
When to use AVIF
AVIF is the choice when maximum compression is the priority. Based on the AV1 video codec, it achieves 50-60% smaller files than JPEG and 20-30% smaller than WebP at equivalent perceptual quality. AVIF also supports HDR imagery with 10-bit and 12-bit colour depth, wide colour gamuts like BT.2020, and the PQ and HLG transfer functions — features no other web image format offers. For high-end photography portfolios, e-commerce product shots, and any scenario where bandwidth is constrained, AVIF delivers the smallest possible file sizes.
The trade-off is encoding speed — AVIF compression is computationally expensive, taking 5-10x longer than WebP for equivalent results. This makes AVIF best suited for pre-encoded assets processed during build time, not for on-the-fly compression of user uploads. Use our AVIF compressor to generate optimised AVIF images from any source format. For batch conversion of your entire media library, the bulk compressor supports AVIF output alongside WebP and legacy formats.
WebP vs AVIF: file size comparison
A 12-megapixel photo (4000×3000px) from a modern smartphone: JPEG at quality 85: 500-900 KB. WebP lossy at quality 85: 350-600 KB. AVIF lossy at quality 60: 200-400 KB. Difference: AVIF is 40-50% smaller than WebP and 55-70% smaller than JPEG while maintaining equivalent perceptual quality.
A 1920×1080 screenshot with text and UI elements: PNG lossless: 400-1200 KB. WebP lossless: 300-800 KB. AVIF lossless: 200-600 KB. Difference: Both formats beat PNG significantly, with AVIF offering 25-35% additional savings over lossless WebP for screenshots with complex UI elements.
A 1024×1024 product image with transparency: PNG-32: 150-400 KB. WebP lossy with alpha: 60-150 KB. AVIF lossy with alpha: 40-100 KB. Winner: AVIF with transparency produces the smallest files of any web format, though WebP with alpha is a close second and encodes much faster — a practical trade-off depending on your workflow.
The Verdict
Neither format is universally better. WebP wins on browser support (97% vs 80%), encoding speed (5-10x faster), and simplicity — it is a drop-in replacement for JPEG and PNG on virtually every modern browser. AVIF wins on compression efficiency (20-30% better than WebP), HDR support, and future-proofing. The recommended approach is to serve AVIF as the primary format with a WebP fallback using the picture element, and a JPEG fallback for legacy browsers. This gives you the best of all worlds: maximum space savings for modern browsers, broad compatibility for the rest, and no compromise on quality.
Frequently asked questions
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Which has better compression — WebP or AVIF?
AVIF offers significantly better compression than WebP — typically 20-30% smaller files at equivalent visual quality. AVIF is based on the AV1 video codec and uses advanced intra-frame compression techniques that outperform WebP's VP8-based compression. For the same 100 KB WebP image, an AVIF version might be 70-80 KB with identical perceptual quality.
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Which format has better browser support?
WebP has better browser support, working in approximately 97% of browsers globally including all major browsers. AVIF is supported in about 80% of browsers — Chrome, Firefox, and Safari (since iOS 16 and macOS Ventura) support it, but some older browsers and legacy systems do not. For maximum compatibility, serve WebP as a fallback alongside AVIF using the picture element.
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Does WebP or AVIF support transparency?
Both WebP and AVIF support transparency (alpha channel). WebP supports lossless and lossy transparency, though lossy WebP with alpha is less efficient than AVIF. AVIF handles transparency particularly well, combining alpha channels with its superior compression algorithm to produce smaller transparent images than WebP in most cases.
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Which format should I use for my website?
Use both — serve AVIF as the primary format with WebP as a fallback using the picture element. This gives you the smallest possible file sizes for modern browsers while ensuring compatibility everywhere. For images where encoding speed matters (user-generated content that is compressed on the fly), WebP may be preferable as it encodes 5-10x faster than AVIF.
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Can I convert between WebP and AVIF?
Yes — our compressor supports converting between WebP and AVIF. Converting WebP to AVIF can reduce file size by an additional 20-30% while maintaining quality. Converting AVIF to WebP may be necessary for broader compatibility. Use our image converter for single files or the bulk image compressor for batch format conversion across your entire image library.
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Is AVIF significantly better than WebP?
Yes, AVIF delivers 20-30% better compression than WebP at equivalent quality, along with support for HDR (10-bit and 12-bit colour depth) and wider colour gamuts like BT.2020. However, WebP encodes 5-10x faster and has broader browser support. For archival or one-time compression of static assets, AVIF is superior. For real-time compression of user uploads, WebP is often more practical.
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