Gzip decompress

A .gz file is a single file compressed with gzip (RFC 1952, DEFLATE per RFC 1951). You meet it with downloaded logs, backups or datasets. This tool reverses the compression and gives you back the original file - bit-for-bit, with no quality loss.

Decompression runs entirely locally in your browser (fflate, pure JavaScript). The file name is derived from the .gz name. Nothing is uploaded - it works offline too.

Such packages appear everywhere in the Unix world: rotated server logs, scientific measurement series, exported database tables or software sources from a mirror server. A double click is far from always enough on Windows because the operating system often ignores this suffix out of the box. Here you load exactly one such item, recover the original content and spare yourself any installation of extra specialised software - just as practical on a tablet on the move as on a workplace machine without admin rights.

One important quirk: gzip only ever compresses a single file. Bundling several files or a whole folder at once is something the .gz format cannot do by design - for that, the files are first collected with tar and then gzip-compressed (.tar.gz). You unpack such a double bundle here in two steps.

Specifications

In 3 steps

1. Drop or pick your .gz file.
2. The tool decompresses locally.
3. Download the original file.

Limitations: Handles single .gz files (no .tar.gz unpacking into individual files - first gzip-decompress, then extract the TAR). Corrupt or incomplete .gz files are rejected.

FAQ

Related tools

Gzip compress · Extract ZIP · Extract TAR · SVGZ to SVG · Create ZIP · Create TAR