AVIF vs WebP: Next-Gen Image Format Comparison
What Are Next-Gen Formats?
Next-gen image formats refer to modern compression standards designed to outperform legacy formats like JPEG, PNG, and GIF. Both WebP and AVIF are considered next-gen, but they come from different origins and target slightly different use cases.
WebP was introduced by Google in 2010 and has become the de facto standard for web optimization. AVIF, based on the AV1 video codec, emerged in 2019 and promises even better compression ratios.
WebP: The Established Standard
WebP has had over a decade of refinement and adoption. It supports both lossy and lossless compression, transparency, animations, and delivers 25-35% smaller files than JPEG at equivalent quality.
Its main advantage is maturity. WebP is widely supported by CDNs, content management systems, and image processing libraries. If you need a format that works reliably today across almost all modern browsers, WebP is the proven choice.
AVIF: The New Challenger
AVIF leverages the AV1 video codec technology to achieve compression gains that exceed WebP by roughly 20-30%. In blind quality tests, AVIF files at smaller sizes often look indistinguishable from the original source.
However, AVIF comes with higher encoding complexity. Creating AVIF images requires significantly more processing power and time compared to WebP or JPEG. This can be a bottleneck for content management systems that need to generate thumbnails at scale.
Compression Ratio Face-Off
At identical visual quality (using SSIM metrics), here is how the formats compare for a typical 1920x1080 photograph:
- JPEG (80%): ~500KB — Baseline
- WebP (lossy): ~320KB — 36% smaller than JPEG
- AVIF: ~240KB — 52% smaller than JPEG, 25% smaller than WebP
- Lossless PNG: ~2.5MB — Baseline for graphics
- Lossless WebP: ~1.8MB — 28% smaller than PNG
- Lossless AVIF: ~1.5MB — 40% smaller than PNG, 17% smaller than WebP
Browser Support Landscape
As of 2025, WebP holds the advantage in browser support with roughly 97% global coverage. AVIF has grown significantly and is supported by Chrome, Firefox, and Safari (16.4+), covering approximately 80-85% of global users.
The key gap is older versions of Safari and some legacy mobile browsers. If your audience skews toward older devices or iOS versions, WebP is the safer choice for now.
Which Should You Use?
The ideal strategy is to use both. Serve AVIF as your primary format with a WebP fallback and a JPEG or PNG fallback for legacy browsers. This ensures maximum compression for users on modern browsers while maintaining full compatibility.
If you can only pick one, choose WebP for general-purpose web use where broad compatibility matters, and experiment with AVIF if your audience is predominantly on modern Chrome, Firefox, or Safari browsers and you want to maximize performance.
Frequently Asked Questions
Is AVIF better than WebP?
AVIF offers better compression ratios (20-30% smaller files than WebP at equivalent quality), but WebP has broader browser support and faster encoding times. Neither is universally better; the right choice depends on your audience and infrastructure.
Does AVIF support transparency like PNG?
Yes, AVIF supports alpha channel transparency, just like PNG and WebP. This makes it a viable replacement for PNG in scenarios where you need transparent backgrounds.
Can I use AVIF for animated images?
Yes, AVIF supports animated image sequences, similar to animated WebP or GIF. The file sizes are typically much smaller than GIF and comparable to animated WebP.