Compress files to Gzip (.gz) format online using native browser CompressionStream. Free, fast and completely private in-browser tool.
Select the file you want to compress into Gzip format.
Specify your output filename or keep the default name.
Click 'Gzip Compress' to generate and download your .gz file.
Your data is processed entirely inside your browser using client-side JavaScript. Nothing ever travels over a network to any server — making BunchTool the most private option available.
Because everything runs locally in your browser, there are no upload queues or server wait times. Results appear in seconds regardless of your internet speed — or even without any connection at all.
Generate standards-compliant .gz archives compatible with server deployments, database backups, and Unix terminal utilities.