No. Compression and decompression both run entirely in your browser.

What's the difference between this and the ZIP tool?

Gzip compresses exactly one file with no container format around it. ZIP bundles and compresses any number of files into a single archive with a directory listing.

Gzip Compressor

Runs in your browser

Compress a single file to .gz, or decompress an existing .gz file back to its original bytes — entirely in your browser.

Drop files hereor click to choose — nothing is uploaded

About this tool

Gzip is the compression format behind most web servers' Content-Encoding, and a common way to shrink a single large file — log files, database dumps, text exports — before sending or archiving it. Unlike ZIP, gzip only ever compresses one file at a time; for bundling several files together, use the ZIP File Creator instead.

How to use

Choose Compress or Decompress.
Add a file.
Run, then download the result.

When to use this tool

Shrinking a large log file or CSV export before storing or emailing it.
Decompressing a .gz file someone sent you.
Preparing a file for a system that expects gzip specifically, rather than ZIP.

Tips

Gzip compresses one file only — for multiple files, zip them first, then optionally gzip the archive.
Already-compressed formats (JPEG, PNG, MP4) won't shrink much further under gzip.

Limitations

Gzip compresses a single file — for multiple files, use the ZIP File Creator instead.

FAQ

Is my file uploaded?: No. Compression and decompression both run entirely in your browser.
What's the difference between this and the ZIP tool?: Gzip compresses exactly one file with no container format around it. ZIP bundles and compresses any number of files into a single archive with a directory listing.