What is a .7Z file?
7Z is a high-compression archive format. Created and opened by the free 7-Zip tool.
- Did you know
- 7z is the native format of 7-Zip, released in 1999, and usually compresses tighter than ZIP.
- The 7z format relies on LZMA, an algorithm Igor Pavlov wrote himself, and can encrypt its contents with 256-bit AES.
- 7-Zip and the .7z format are open source, and its LZMA SDK was placed in the public domain, so the algorithm spread into installers, firmware images, package managers and many other tools.
- Analyser spots a .7Z file by its signature bytes
37 7A BC AF.
- What Analyser shows you
- Browse the file tree and compression details of archives without extracting them: ZIP in pure JavaScript, and RAR, 7z, TAR and compressed tarballs (.tar.gz / .tgz, .tar.xz, .tar.zst, .tar.bz2) through a bundled libarchive engine - click any file inside to analyse it. A single compressed stream (.gz, .xz, .zst, .lz4, .lzma, .Z) is decompressed so the file within can be opened; bare .bz2 streams are identified only.
- Open a .7Z file
- Drag a .7Z file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.