Gzip Compress — Compress Text Data with Gzip Online

Compress text or data using the Gzip (DEFLATE) algorithm and receive a Base64-encoded output. Useful for testing Content-Encoding headers and compressing data payloads.

Key Features

Uses standard DEFLATE compression algorithm with gzip headers
Outputs compressed data as Base64 string ready for network transfer
Displays original size, compressed size, and byte savings percentage
Server-side Gzip compression over HTTPS; input is not stored

How to Use

Paste your text or payload into the input editor.
Click "Compress with Gzip" to process the data.
Review the compression ratio and byte metrics.
Copy the Base64-encoded compressed output.

Example

Sample input

Repeat repeat repeat repeat for compression demo.

Sample output

H4sIAAAAAAAA/6tWSkksSVSyUlAqS8wpTtVRKi1OLYpJLMnMz+NSKkhJLEktVrJSAgBEGR6yGQAAAA==

Edge Cases

Empty string still yields a small gzip header
Binary input vs UTF-8 text
Already compressed data ( poor ratio )

Frequently Asked Questions

How does Gzip compression achieve such high size reductions on text?

Gzip utilizes the DEFLATE algorithm, which identifies repeating byte sequences and strings using LZ77 and replaces them with compact Huffman codes.

Why is the output encoded in Base64?

Gzip produces raw binary bytes. Encoding the binary output in Base64 makes it safe to copy, paste, store in JSON, or transmit across text-only protocols.

Can this compressed data be unpacked by standard tools like gunzip?

Yes. Once decoded from Base64 into binary bytes, any compliant tool (such as gunzip, zlib, or PHP gzdecode) can decompress it.

Related Tools

Gzip Decompress — Decompress Gzip Data Online Base64 Encoder — Encode Text to Base64 Online JSON Minifier — Compress JSON Online Free CSS Minifier — Compress CSS Stylesheets Online

Privacy notice: when you run this tool, your input is sent over HTTPS to our server, processed in memory and returned. It is not stored or logged. Avoid pasting live secrets such as private keys or passwords.