How to compress 7Z
- 1
Add your 7Z files
Drag and drop 7Z files onto the compressor, paste them, or click to browse. You can add several at once.
- 2
Keep the default
7Z compression is lossless, so there's nothing to tune: every file comes back with identical contents.
- 3
Compress
Click Compress. Files are processed in an isolated cloud sandbox and are usually ready in seconds.
- 4
Download
Download each smaller 7Z, or everything at once as a ZIP.
What compression does to 7Z
Repacks every file at maximum compression; the contents are byte-identical.
It's lossless, so there are no quality levels to choose between: every file comes back with identical contents, just packed more tightly.
Why there are no target sizes
Lossless compression never throws anything away, so how small a 7Z can get depends entirely on what's in it. There's no quality dial to turn until the file hits 1 MB or 100 KB, which is why 7Z has no target-size pages.
7Z · 7-Zip Archive
7Z is the high-compression archive format of 7-Zip, often producing much smaller files than ZIP.
- Type
- Archive
- Extension
- .7z
- MIME
- application/x-7z-compressed
- Best for
- compressing large collections of files
Compressing 7Z: frequently asked questions
Smaller 7Z files, in seconds.
No sign-up, no watermark. Files are processed in an isolated sandbox and deleted automatically.
- Most conversions never leave your device
- Cloud files deleted automatically
- No watermarks