WebP vs AVIF: Browser Support and Encoding Trade-offs — Technical Comparison

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WebP vs AVIF: Browser Support and Encoding Trade-offs — Technical Comparison

WebP (Google) and AVIF (AOMedia, based on AV1) are the two dominant modern image formats. Both beat JPEG and PNG for compression, but they differ in support, encoding cost, and quality. This guide compares them technically.

Quick Comparison

Aspect WebP AVIF
Based on VP8/VP9 AV1
Compression 25–35% smaller than JPEG 20–50% smaller than JPEG (often better than WebP)
Encoding speed Fast Slow (2–10× slower than WebP)
Decoding speed Fast Moderate (improving)
Browser support Universal (all modern) Chrome, Firefox, Edge, Safari 16+
Alpha/transparency Yes Yes
Animation Yes Yes
HDR Limited Yes (10/12-bit)
Color depth 8-bit 8, 10, 12-bit

Compression Efficiency

For the same visual quality (e.g. SSIM or subjective):

  • AVIF typically yields 20–50% smaller files than JPEG.
  • WebP yields 25–35% smaller than JPEG.
  • AVIF vs WebP: AVIF often saves another 15–30% over WebP at comparable quality.

The gap depends on content and encoder settings. Synthetic/UI graphics often show a larger AVIF advantage than natural photos.

Encoding Speed

Encoding time (relative to JPEG, same machine):

Format Relative time
JPEG 1×
WebP ~2–3×
AVIF ~5–20×

AVIF encoding is CPU-intensive. For real-time or high-volume pipelines, WebP is usually more practical.

Decoding Speed

  • WebP: Mature, hardware-accelerated on many devices. Generally fast.
  • AVIF: Decoding was slower initially; recent browsers and devices have improved. Can still be slower on low-end mobile.

For typical web use, both decode fast enough. AVIF may add a few dozen ms on weaker devices.

Browser Support (2026)

WebP

  • Chrome, Firefox, Safari, Edge: full support.
  • Safari: since 14 (2020).
  • Effectively universal for modern browsers.

AVIF

  • Chrome: since 85 (2020)
  • Firefox: since 93 (2021)
  • Safari: since 16 (2022)
  • Edge: supported

Legacy browsers (old Safari, IE) lack AVIF. Use format negotiation:

<picture>
  <source type="image/avif" srcset="image.avif">
  <source type="image/webp" srcset="image.webp">
  <img src="image.jpg" alt="">
</picture>

When to Use WebP

  • Need broad compatibility with minimal hassle.
  • Encoding throughput matters (bulk, real-time).
  • Decoding on very low-end devices is a concern.
  • Current default for “better than JPEG, widely supported.”

→ PNG to WebP | JPEG to WebP

When to Use AVIF

  • Targeting modern browsers only.
  • Maximizing compression (storage, bandwidth).
  • HDR or 10-bit color is needed.
  • Encoding time is acceptable (e.g. build-time, not real-time).

Encoding Recommendations

  1. Quality/effort trade-off: Use -quality 80–85 for WebP; equivalent visuals with AVIF at -q 50–65 (encoder-specific).
  2. Lossless: Both support it; WebP lossless is often faster and sufficient for UI assets.
  3. Try both: Encode same image to WebP and AVIF, compare size and decoding in target environments.

Conclusion

  • WebP: Safe default—fast encode/decode, wide support, good compression.
  • AVIF: Best compression when build time and compatibility are acceptable.
  • Production: Serve both via <picture>, fallback to JPEG/PNG for older clients.

Convert to WebP: PNG to WebP | JPEG to WebP

Fri Mar 13 2026 00:00:00 GMT+0000 (Coordinated Universal Time)