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Best format guide

Best Image Format for Web Performance

Use WebP by default for web image delivery with JPEG/PNG fallbacks.

Open Samples Open Manifest
Recommendation

Recommendation

WEBP

WebP balances strong compression and broad modern browser support for most web image workloads.

image/webp

Open Samples Open Hub

AVIF

Use AVIF when aggressive size reduction matters and client support is confirmed.

Files: 4

Samples Hub

JPEG

Use JPEG for broad legacy compatibility and photo-heavy catalogs.

Files: 6

Samples Hub
Decision factors

Decision Factors

Decision Factors

  • Target browser/device support matrix.
  • Expected quality at production compression settings.
  • Transparency and animation requirements.
  • CPU cost of encode/decode in your pipeline.

Common Mistakes to Avoid

  • Shipping a single format to all clients without fallback behavior.
  • Comparing formats at mismatched quality levels.
  • Ignoring decode-time regressions on low-power devices.
PNG vs WebP JPEG vs AVIF How to Convert AVIF to JPEG
FAQ

FAQ

What is the primary recommendation in this guide?

WEBP is the recommended default for this use case.

How should teams validate this format choice?

Use sample fixtures and manifest endpoints to test compatibility, performance, and conversion behavior in production-like conditions.