Open a 7z file without installing 7-Zip
7-Zip archives unpacked in the browser, for computers where you cannot install 7-Zip.
- Nothing is uploaded
- Works offline after first use
- Open source
- No watermark · limit is your device’s memory; phones hold less
Extract .7z archives in your browser on any computer or phone, no 7-Zip install needed. It is free, needs no account and adds no watermark, and your files are not uploaded: everything runs in your browser on your device. The size limit is your device’s memory, and phones hold less; give the page a short while after your first run to save itself for offline use, and then it works offline.
Done
Open the network tab. Your files never appear in it.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
7z is the format of 7-Zip, a free Windows archiver that squeezes files smaller than ZIP does, which is why game mods, datasets and software downloads often come as .7z. Macs, Chromebooks and phones have nothing built in to open it, and on a managed work PC you may not be allowed to install 7-Zip.
A worked example: a colleague shares survey-data.7z. Drop the file here and press Extract 7z. The CSV files inside appear in a list; download the one you need, or all of them as a ZIP that every system opens. Password-protected (encrypted) 7z archives are not supported yet: in our tests they did not open even with the correct password, so use 7-Zip for those or ask for a ZIP.
Solid 7z archives, where many files are compressed as one block, are unpacked from the start each time, so extracting from a large solid archive takes a little while even if you want one file.
How it works
- Drop the .7z file.
- Press Extract 7z and download what you need.
In your browser, not on a server
libarchive (BSD-2-Clause), the archive library behind bsdtar, compiled to WebAssembly by libarchive.js (MIT), runs in a background worker in your tab. It detects the format from the file itself, opens password-protected ZIP files when you give the password, and hands back each file. The worker and its WebAssembly, about 1 MB, are served from this site the first time you extract something, then cached. Downloading everything packs the files into one plain ZIP with fflate (MIT), keeping the folders.
Compared with upload-based tools: Online extractors upload the whole archive, including any password you type, to their servers, and many cap the size. Here nothing leaves your device, password-protected ZIPs stay private, and the limit is your device’s memory (phones hold less).
Verify it yourself. Give the page a short while after your first run to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
Which 7z compression methods work?
LZMA and LZMA2, the defaults, as well as BZip2, Deflate and stored archives. Zstandard-compressed 7z files from 7-Zip forks may not open.
Can it open an encrypted 7z?
Not yet. Encrypted 7z archives did not open in our tests even with the correct password. Password-protected ZIP files do open here.
Can it split or join .7z.001 volumes?
Not yet. Join the parts with 7-Zip or with a command-line copy first, then open the joined file here.
Why is a 7z much smaller than the same files zipped?
7z’s LZMA compression looks much further back for repeated data than ZIP’s Deflate, so text, code and data files often shrink a third more. Photos and videos are already compressed and barely shrink in either.
Is the file uploaded?
No. The archive is read by libarchive running in this tab.
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Guides
- How to open a RAR or 7z fileRAR and 7z are archive formats like ZIP, but not every device opens them. Here is what works on Windows, Mac and phones, and a way that needs no install.