Compress and decompress data using Meta's Zstandard algorithm (RFC 8878). Experience gigabyte-per-second decompression speeds and download .zst files.
Next-gen web compression
While Brotli focuses primarily on maximum density for static text, Zstandard was designed by Meta for high real-time throughput.
Zstandard decompresses at over 1.5 GB/s per CPU core, reducing main-thread decompression overhead on resource-constrained mobile devices and accelerating page rendering.
With official standardization under RFC 8878 and broad browser support (Chrome 123+, Safari 18+), modern web servers and CDNs are adopting `content-encoding: zstd` as the successor to Gzip.
Use this tool to encode, decode, and benchmark ZSTD payloads and generate `.zst` files for your web stack.
Zstandard (RFC 8878) is a modern real-time data compression algorithm developed by Yann Collet at Meta. It provides compression ratios comparable to Deflate/Gzip while operating several times faster in compression and reaching multi-gigabyte-per-second decompression speeds.
Supported natively by Chrome 123+, Safari 18+, and major edge networks like Cloudflare, content-encoding: zstd achieves dramatic CPU savings on servers and nearly instantaneous decompression on low-power mobile devices.
You can paste raw text or upload any file in the Compress tab to receive a downloadable .zst file or Base64 string. To decode, paste the Base64 ZSTD payload or upload a .zst file in the Decompress tab.
FSE is the breakthrough asymmetric numeral system (ANS) entropy coder powering Zstandard. It provides the compression density of arithmetic coding with the speed of simple table lookups.
