Zstandard compression

Zstandard or zstd is a fast lossless compression algorithm. When used as a content encoding, it is often faster and offers better compression than brotli.

Baseline Status: Achieved Newly Available on Feb 11, 2026 across core engines.

Desktop Browser Engine Support

Google Chrome

123

Supported

Mozilla Firefox

126

Supported

Apple Safari

26.3

Supported

Microsoft Edge

123

Supported

Mobile Browser Engine Support

Chrome Android

123

Firefox Android

126

Safari iOS

26.3

Specifications and References

Specification ↗ Can I Use (zstd) ↗ Feature XML ↗

MDN Browser Compat Data Keys:

http.headers.Accept-Encoding.zstd ↗ http.headers.Content-Encoding.zstd ↗