GZIP Compress / Decompress
Compress or decompress text with GZIP entirely in the browser. View compression ratio and copy the result.
Frequently Asked Questions
What is GZIP compression?
GZIP is a widely-used data compression algorithm based on DEFLATE. It is the standard compression for HTTP responses, reducing transfer sizes by 60-90% for text-based content like HTML, CSS, and JSON.
How does this tool work without a server?
This tool uses the browser-native CompressionStream and DecompressionStream APIs, which are available in all modern browsers. No data is sent to any server — everything runs locally in your browser.
Why is the compressed output shown as Base64?
GZIP produces raw binary data that cannot be displayed as text. Base64 encoding converts that binary output into a safe ASCII string so you can copy, share, and store it easily.
What compression ratio should I expect?
Typical text compresses 60-90% with GZIP. Highly repetitive text compresses better, while already-compressed or random data may not shrink much — or may even grow slightly due to GZIP header overhead.