1999.LOC

It opens zip, 7z, rar and tar. It makes zip.

Reading the other formats is libarchive, the same library behind bsdtar and most of the extract buttons on a Linux desktop, compiled to WebAssembly and run here in the tab. It brings its own readers for RAR (both the old format and RAR5), 7z, tar, cpio, ISO and CAB. It is 600KB, so it is only fetched when something turns up that needs it: opening a plain zip never downloads it.

Making a RAR is not possible, here or in any free software. The format is proprietary and there has never been a compressor for it outside WinRAR itself. Making a 7z is possible in principle and not done here, because the build this uses reads only. So anything you create on this page comes out as a zip, which every one of those tools can open.

The format is read from the file's first bytes rather than its name, so a .zip that is really a 7z opens anyway, and a .7z that is really a zip takes the fast path.

In this tab. The archive is never uploaded.

Every “unzip online” site opens your archive on their server. This one reads it where it already is, on your machine.

Is this actually private?

The honest notes

• Nothing is uploaded. Static page, no endpoint, no account. The archive is read from disk into this tab and anything you extract is written back out of it.
• The list costs nothing. A ZIP keeps an index of its contents at the end of the file, so what is in a 500 MB archive can be shown without unpacking any of it. Only the files you actually ask for are decompressed.
• A path inside an archive is not to be trusted. Nothing in the format stops a file being named ../../../.ssh/authorized_keys, and extractors that join that to a folder without checking write outside it, an old bug that still catches people. Any ../ in a name is stripped here, so an entry cannot escape the folder you extract into, and the page says when an archive contains one.
• It reads ordinary ZIPs and says so when it cannot. Stored and deflated entries, which is what every normal archive contains. It does not read password-protected entries, ZIP64 archives (over four gigabytes or 65,535 files), or the rarer compressions like bzip2 and LZMA, and it names which of those it hit rather than producing a broken file.
• RAR, 7z and tar are read, not written. They are not ZIP with a different extension, so reading them pulls in libarchive (about 600 KB of WebAssembly, the first time you open one), which has its own readers for those formats. Making an archive here always produces a ZIP, because RAR in particular cannot be created by any free software. A .docx, .xlsx, .pptx, .epub, .jar and .apk are ZIPs, and open here fine, which is a good way to see what an Office document is really made of.
• A plain ZIP needs no download at all. DecompressionStream is built into the browser and is exactly the algorithm ZIP uses, so for an ordinary ZIP there is no decompressor here to get wrong and nothing extra to fetch. That path is about eight kilobytes of code; the larger libarchive above loads only when you open a RAR, 7z or tar.
• It works in memory. Everything is held in the tab, so a very large archive can run one out of memory. Extracting a few files at a time is the fix.

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