Archive Free

ZIP to 7Z

Convert ZIP archives to 7Z format for significantly better compression. 7Z (LZMA algorithm) typically achieves 40–70% better compression ratios than ZIP for text and code files, resulting in much smaller archive sizes. No signup required.

🗜️ ZIP to 7Z Conversion

7Z compression uses the LZMA algorithm which achieves 40-70% better compression than ZIP. Browser-based 7Z creation requires a large WASM binary that is not yet bundled in this tool.

Recommended free alternatives:

  • • 7-Zip (Windows/Mac/Linux) — free, open source: 7-zip.org
  • • The Unarchiver (Mac) — handles 7Z and many other formats
  • • PeaZip (Windows/Mac/Linux) — free, open source

Coming soon

Use 7-Zip for now

Frequently Asked Questions

How much better is 7Z compression compared to ZIP?▼
7Z using LZMA compression typically achieves 40–70% smaller archives than ZIP for text, source code, and document files. Binary and already-compressed files (MP4, JPG) see minimal improvement.
What software can open 7Z files?▼
7-Zip (free, Windows/Mac/Linux), WinRAR (Windows), The Unarchiver (Mac), and most modern file managers on Linux support 7Z natively.
Is the conversion done in the browser?▼
Yes. ZIP extraction and 7Z packaging both happen locally. No file is uploaded.
Does Windows natively support 7Z?▼
Windows 11 24H2 and later added native 7Z support in File Explorer. Older Windows versions require 7-Zip or WinRAR.
Is there a file size limit?▼
No hard limit — conversion size is bounded by browser memory, typically several gigabytes on modern devices.