Extract 7Z
Open a .7z archive and download what is inside — no 7-Zip install, nothing uploaded.
Extract Archives
Select a .zip, .rar, .tar.gz or .7z file to extract its contents inside your browser. No files are uploaded to any server.
The format nothing opens by default
ZIP is built into every operating system. 7z is not built into any of them, which is the awkward part: someone sends you a .7z, and getting one document out of it means installing an archive manager first. That is a lot of ceremony for a file you will read once.
This page reads the format directly. libarchive — the same reader behind a great many desktop tools — is compiled to WebAssembly and runs in a background thread on your own machine.
Why it compresses so much better
7z uses LZMA, which looks for repeated data across a window measured in megabytes rather than the 32 KB that deflate — the algorithm inside ZIP — works with. It also compresses the files as one continuous stream instead of one at a time, so twenty similar spreadsheets share their redundancy rather than each carrying its own copy.
The trade-off is on the way out: because the stream is continuous, pulling a single file from the end of a large archive can mean working through much of what came before it. That is why a big 7z takes noticeably longer to open than a ZIP of the same size.
What is refused, and why
Encrypted archives are declined with a message rather than a confusing error, since nothing here asks for a password yet. Very large or deliberately malicious archives are refused too: everything is extracted into memory, so the archive's own listing is checked against the same caps ZIP extraction uses before any of it is decompressed.