7Z Converter
FileFlip converts 7Z files into 11 other formats entirely inside your browser, using libarchive compiled to WebAssembly. The 7Z file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. There is no file-size limit and no account to create.
How do I convert a 7Z file?#
- Drop your 7Z file onto the converter at the top of this page, or click it to pick one from your computer.
- Choose the format you want out of it. FileFlip downloads the engine that conversion needs, once, and your browser caches it.
- Conversion starts the moment you pick the format, and the result is yours to download. The work happens in this tab, so nothing is uploaded and nothing is queued.
Is it safe to convert 7Z files online?#
Yes, because nothing is uploaded. FileFlip converts 7Z files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What happens to a 7Z file#
FileFlip converts 7Z into 11 formats with libarchive, all of it inside the browser tab. Each conversion below names the engine it uses, what it downloads, and exactly what that conversion keeps or drops.
| Category | Archives |
|---|---|
| File extension | .7z |
| FileFlip support | Read only, so it is a source rather than a target |
| Conversions available | 11 |
| Engines | libarchive |
| Downloaded to your browser | 1.0 MB on the first conversion, then cached |
What is a 7Z file?#
A 7z file is Igor Pavlov's archive container, most often holding data compressed with the LZMA or LZMA2 algorithm as one continuous solid stream rather than as separate per-file entries.
Use 7z when the files inside compress well together, such as source trees or similar documents, and the smallest possible archive matters more than universal compatibility.
Convert 7z to ZIP when the archive has to be opened somewhere without 7-Zip installed, since Windows and macOS still can't open 7z without adding software.
The 7Z file format reference covers the specification, the programs that open one, and what each conversion keeps or drops.
7Z questions people ask#
Why are 7z files usually smaller than ZIP?
7z compresses the entire archive as one solid LZMA2 stream instead of compressing each file on its own, so repeated patterns across different files in the archive still count toward the compression. That solid approach is what gives 7z its size advantage over ZIP on a folder of similar files.
Why can't Windows open a 7z file without extra software?
Windows Explorer only has built-in support for ZIP, so opening a 7z file needs a separate program like 7-Zip, which is free. macOS Finder has the same gap and needs something like Keka or The Unarchiver.
Is 7z encryption safe?
7z supports AES-256 encryption, and unlike ZIP it can also encrypt the archive's file names, so a locked 7z doesn't reveal what's inside even without the password. The key is derived from the password with SHA-256 run over 2^19 iterations, which makes brute-forcing it slow.
Does 7z lose file permissions like Unix ownership?
The base 7z format doesn't store Unix file permissions or ownership the way tar does, so archiving a Linux directory tree as 7z can lose that metadata on extraction. Tools built around tar, including tar.xz, keep it.
Is the 7z format free to use?
Yes. 7-Zip is released under the GNU LGPL, and the LZMA SDK it's built on was placed in the public domain in December 2008, so there's no licensing cost or patent concern in building a tool that reads or writes 7z.