Compress and decompress text or files with Gzip directly in your browser. Inspect byte savings, convert between Base64/Hex, and download .gz archives.
Compression utility
Gzip remains the most widely supported compression format on the web, supported by virtually all web servers, reverse proxies, and browsers worldwide.
It reliably shrinks text documents, JSON APIs, and source bundles by 65% to 80%, slashing Time to First Byte (TTFB) and mobile data usage.
This tool enables developers to inspect Gzip byte streams, verify compression efficiency, and decompress payloads captured in network logs, webhook headers, or cloud storage without requiring command-line utilities like `gzip` or `gunzip`.
Runs completely locally in your browser using the standard Web Streams API.
Gzip uses the DEFLATE algorithm (RFC 1951), combining LZ77 duplicate string substitution and Huffman entropy coding. It finds repeated substrings in your input and replaces them with shorter pointer references, achieving 60% to 80% compression on repetitive text, JSON, HTML, and code.
Yes! It uses the browser native CompressionStream and DecompressionStream APIs. Your data is compressed and decompressed entirely on your device without ever being uploaded to any server.
You can export your compressed Gzip archive as a standard downloadable .gz binary file, a Base64-encoded string, or a hexadecimal byte representation for debugging network packets and API headers.
Yes. You can upload any text or binary file to compress into a .gz file, or upload an existing .gz archive to decompress back to its original uncompressed content.
Gzip is supported by virtually 100% of all internet clients and servers. Brotli is newer and features a built-in dictionary of common web keywords, allowing it to compress HTML, CSS, and JS 15% to 25% smaller than Gzip.
