Compress a file to a .gz file locally - lossless, no upload, right in your browser.
Running locally on your device ...
Running locally on your device ...
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Your files never left your device
Continue with this file
No re-upload neededThese tools accept .GZ - your file is handed over directly.
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
Gzip (.gz, RFC 1952) is a lossless compressor for single files - common for log files, backups, database dumps and on the web (Content-Encoding: gzip). Unlike ZIP, gzip does not bundle multiple files; it compresses exactly one file particularly efficiently.
Compression runs locally in your browser (fflate, pure JavaScript, DEFLATE per RFC 1951) - with a fixed setting (level 6) that balances speed and file size well, just like the gzip command-line tool. Nothing is uploaded.
Text-like content with many repetitions benefits the most: verbose logs, CSV exports, SQL dumps or source code can often shrink to a fraction. That is exactly why web servers deliver pages gzip-encoded and save bandwidth. If instead a whole folder should be combined, bundle it as a TAR first and pass the result through here - that yields the common .tar.gz suffix.
| Output format | GZ |
|---|---|
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Gzip compresses exactly one file (for several, create a TAR or ZIP first). Already compressed files (JPG, MP3, ZIP) barely shrink. One file per run.
No. Compression runs entirely locally in the browser.
The tool automatically uses a fixed, well-balanced level (6) - the same speed/size compromise the gzip command-line tool uses by default. Text files such as CSV, JSON or logs often shrink by 60 to 80 percent; already-compressed formats like JPG or MP3 barely shrink at all, because they lack the repetition compression relies on.
Gzip packs only one file. For several, create a TAR first, then gzip it.
Yes. Decompressing gives you back exactly the original file.
Gzip decompress · Create ZIP · Create TAR · Extract ZIP · Extract TAR · CSV to XLSX