AVIF vs WebP: Real-World Performance Benchmark 2025

·7 min read
AVIFWebPBenchmark
Alex Chen· Image Performance Engineer

Benchmark Setup

We tested 100 images (mix of photos, illustrations, screenshots) at quality 80, measuring encoding time and output size.

Results Summary

MetricWebPAVIFWinner
Avg. file size1.6 MB1.1 MBAVIF (-31%)
Encoding speed120ms850msWebP (7x faster)
Visual quality (SSIM)0.950.96AVIF (marginal)

When AVIF Wins

  • Static hero images (pre-processed at build time)
  • Archival storage
  • Maximum bandwidth savings

    • When WebP Wins

  • Real-time conversion (e-commerce, CMS)
  • High-traffic pages with on-the-fly transforms
  • Maximum browser compatibility

    • Conclusion

    For most websites, WebP at quality 80 offers the best balance. Use AVIF for static assets where encoding time doesn't matter.

    Related Guides

  • WebP vs AVIF: Which to Choose
  • AVIF Browser Support Guide

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