7Z to ZIP Converter
FileFlip converts 7Z to ZIP entirely inside your browser, using libarchive compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert a 7Z file to ZIP?#
- Drop your 7Z file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to ZIP and the conversion starts on its own. FileFlip downloads 1.0 MB of WebAssembly the first time and nothing after that, then runs libarchive on your own machine.
- Save the ZIP file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting 7Z to ZIP lose quality?#
No. Converting 7Z to ZIP does not touch the files inside the archive. Each member is read out and written back byte for byte, so only the wrapper around them changes and nothing is recompressed.
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 7Z to ZIP actually does to the file#
Converting 7Z to ZIP runs on libarchive, downloads 1.0 MB of WebAssembly the first time and nothing after that, copies the archived files through unchanged, keeps file contents, and drops file timestamps and file permissions.
| Engine | libarchive |
|---|---|
| Conversion path | 2 steps: 7Z → the unpacked files → ZIP |
| Downloaded to your browser | 1.0 MB, once, then cached by your browser |
| Quality | Lossless, contents copied unchanged |
| You get back | One file |
| Where it runs | On the page's own thread, so a very large file will make the tab wait |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| File contents | Kept | Carried through into the converted file. |
| File timestamps | Dropped | The target format has nowhere to put it. |
| File permissions | Dropped | The target format has nowhere to put it. |
Worth knowing before you start:
- the built-in ZIP and TAR writer records no timestamps, permissions, or ownership
- every entry is extracted into memory before anything is written, so a very large archive can exhaust it
- this conversion runs on the page's own thread, so a large file will freeze the tab while it works
- no passphrase is passed to the reader, so an encrypted archive cannot be opened
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.
What is a ZIP file?#
A ZIP file is a container introduced by PKWARE in 1989 that holds any number of files and folders, each one compressed and stored as its own separate entry alongside a central directory listing them.
Use ZIP when the archive has to open on any device without the recipient installing anything, or when individual files need to be pulled out rather than the whole archive at once.
Convert away from ZIP when the same files need to be smaller for storage or transfer, since 7z or xz's solid compression usually beats it at the cost of that per-file random access.
7Z to ZIP 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.
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.