Gzip Compress / Decompress
Encoders & DecodersCompress and decompress text with Gzip in your browser. View original vs compressed size, compression ratio, and Base64-encoded Gzip output in real time.
Plain Text
Base64 Gzip
About Gzip Compress / Decompress
The Gzip tool compresses and decompresses text entirely inside your browser using the native Compression Streams API. Paste any text to see the compressed byte count, original byte count, and compression ratio side by side. The Base64-encoded Gzip output is ready to embed in HTTP headers, configuration files, or API payloads without further transformation.
Features
- ✓Gzip compression and decompression powered by the browser's Compression Streams API
- ✓Displays original size, compressed size, and compression ratio in real time
- ✓Outputs Base64-encoded Gzip suitable for direct use in HTTP and config contexts
- ✓Bidirectional — switch between compress and decompress mode instantly
- ✓Copy Base64 Gzip output to clipboard with one click
- ✓Download compressed output as a .gz file
- ✓100% client-side — your text never leaves the browser
Common Use Cases
- Pre-compressing JSON configuration blobs before storing them as environment variables
- Verifying that a Gzip-compressed payload meets a size budget before deploying
- Decompressing Base64-encoded Gzip strings received from APIs for inspection
- Estimating compression ratios for log lines or JSON documents
Frequently Asked Questions
QWhat compression algorithm is used?
Standard Gzip (DEFLATE with a Gzip wrapper), identical to what web servers send in Content-Encoding: gzip responses.
QCan I decompress arbitrary .gz files here?
You can paste the Base64 representation of any Gzip-compressed data and decompress it. Direct binary file upload is not currently supported.
QWhy is my compression ratio low for short strings?
Gzip has a fixed header overhead of roughly 18 bytes. Very short inputs may compress to a larger size than the original; this is expected behaviour.
QIs my data sent to a server?
No. Compression and decompression run entirely in your browser using the Compression Streams API.