Compress 7Z files online free. Achieve ultra-high compression ratio with LZMA2. Reduce 7z archives without quality loss.
Losslessly shrink PNG files.
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Compress 7Z files online free – extreme LZMA2 compression. Reduce 7z archives by up to 80%. Best 7-Zip optimizer.
The 7Z format is known for its superior compression ratio, but you can still optimize existing 7Z archives. Our tool re-compresses using LZMA2 with variable dictionary sizes, often reducing size by an additional 20-25%.
We decompress your 7Z file and then recompress it using the most aggressive settings: LZMA2 algorithm, 256 MB dictionary, solid blocks, and ultra compression level. This is perfect for text, databases, and virtual machine images.
| File Type | Original Size | After 7Z Recompression | Saving |
|---|---|---|---|
| Text/Logs | 100 MB | 18 MB | 82% |
| VM Disk | 5 GB | 1.2 GB | 76% |
| Images (PNG) | 50 MB | 48 MB | 4% |
| Databases (SQL) | 200 MB | 25 MB | 87% |
7z a -t7z -mx=9 -mfb=273 -ms=on -md=256m output.7z input_folder/
-mx=9 = maximum compression, -md=256m = 256 MB dictionary, -ms=on = solid mode.
Software distributors, system administrators, data scientists, and gamers who need to shrink large files for distribution or backup. 7Z is especially effective for repetitive data.
Refer to the FAQ list above. In short – it's the most powerful online 7Z compressor you'll find, completely free.
Everything you need to know about this tool