Three straightforward steps
- Choose or paste the input requested by this tool.
- Configure the options and run the operation locally.
- Review and download or copy the result.
Developer TOOL
GZIP Compress & Decompress
Compress files to GZIP or decompress GZIP files with the browser Compression Streams API.
ON-DEVICESelected input is processed in this browser.
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The selected input stays under your control
On-device processing means the input is handled by browser APIs on the device running this page. Closing or refreshing the page normally clears the active in-memory working session.
Read the Privacy Policy →Compress and decompress files with GZIP streams
Use native browser compression streams where supported.
How to use it
- Choose a file and the compress or decompress action.
- Run the operation and review the output name and size.
- Download and test the resulting file.
Supported input
- Files for GZIP compression
- Valid .gz streams for decompression
Worked example
Compress a 12 MB JSON log into a .gz file before transferring it to a compatible system.
Limitations
- Browser Compression Streams support is required.
- Already-compressed media may become only slightly smaller.
Troubleshooting
- Use a current Chromium, Firefox or Safari release with stream support.
- Confirm a failed decompression input is actually GZIP, not ZIP.
Tool-specific questions
Is GZIP the same as ZIP?
No. ZIP is an archive format; GZIP is a compression stream.
Does compression change file contents?
Decompression should reproduce the original bytes when the stream is valid.
Before you process
Can I use this gzip compress & decompress online without uploading my input?
Yes. This tool is labelled On-device, so the selected input is processed in your browser and is not sent to a ForgeMyFile processing API.
What happens if the browser cannot process it?
The tool shows a readable error and stops. It does not silently fall back to a cloud upload.
Why can performance differ between devices?
The browser is doing the work locally, so speed and practical file size depend on available memory, CPU and browser capabilities.