FileChange

AVIF vs WEBP

AVIF and WEBP are both next-generation image formats competing to be the standard for web delivery, and both outperform JPEG and PNG significantly. AVIF, based on the AV1 video codec, achieves 20-50% smaller files than WEBP at equivalent quality, making it the most efficient image format available today. However, WEBP has a significant head start in browser support, encoding speed, and tooling maturity. AVIF encoding is noticeably slower and browser support, while good, is not yet as universal as WEBP. The choice between them often comes down to whether you need the absolute smallest files (AVIF) or the best balance of efficiency and ecosystem maturity (WEBP).

AVIF vs WEBP — Feature Comparison

Feature	AVIF	WEBP
Compression Efficiency	Best available	Very good
File Size (lossy)	20-50% smaller than WEBP	25-35% smaller than JPG
Encoding Speed	Slow	Fast
Decoding Speed	Moderate	Fast
Browser Support	Chrome 85+, Firefox 93+, Safari 16+	All modern browsers
Transparency	Supported	Supported
Animation	Supported (AVIF sequence)	Supported
HDR Support	Full HDR, wide gamut	Limited
Color Depth	Up to 12-bit	8-bit
Tooling Maturity	Growing	Mature

When to use AVIF

Use AVIF when absolute file size minimization is the priority and you can tolerate slower encoding. AVIF excels for large image-heavy sites where every kilobyte matters -- e-commerce product images, photo galleries, and media-rich pages. Its HDR and wide color gamut support also make it the right choice for high-quality photography.

When to use WEBP

Use WEBP when you need a proven, mature format with fast encoding and broad tooling support. WEBP is the safe choice for most web projects -- the compression improvement over JPEG is substantial, and the ecosystem is fully mature. If encoding speed matters (real-time image processing, CDN transformations), WEBP is significantly faster.

Verdict: AVIF vs WEBP

AVIF produces the smallest files, but WEBP has the more mature ecosystem. The optimal strategy for maximum performance: serve AVIF with a WEBP fallback, then JPG as a final fallback. For simpler setups, WEBP alone provides excellent results.

AVIF vs WEBP — Frequently Asked Questions

Is AVIF supported in Safari?

Yes, since Safari 16 (September 2022). All major browsers now support AVIF: Chrome 85+, Firefox 93+, Safari 16+, Edge 121+.

Why is AVIF encoding so slow?

AVIF uses the AV1 codec, which is computationally intensive. The trade-off is much better compression. Encoding speed is improving with hardware acceleration and libaom optimizations.

Should I use AVIF or WEBP for my website?

Use both with the HTML picture element: AVIF as the primary source, WEBP as the first fallback, and JPG as the final fallback. This gives every browser the best format it supports.

Can AVIF replace both WEBP and PNG?

Technically yes -- AVIF supports both lossy and lossless compression with transparency. In practice, keep PNG for source files and editing, and use AVIF for delivery.