OpenAnyFile
Works
Viewing, inspecting and verifying. You get a browsable listing of everything inside, decompressed in-browser by libarchive compiled to WebAssembly. File details, exact byte size and the detected signature are always shown.
How to open a .7z file
The short version: 7Z is a 7-Zip Archive from Igor Pavlov. The longer version — including the quirk that trips most people up — is below, along with a viewer that runs entirely on your own device.
What is a .7z file?
7-Zip Archive is an archive format developed by Igor Pavlov, first appearing in 1999. It is normally produced by 7-Zip.
Open format with LZMA2. It can encrypt filenames as well as contents, unlike standard ZIP where the file listing stays visible.
| Full name | 7-Zip Archive |
|---|---|
| File category | Archives |
| MIME type | application/x-7z-compressed |
| Magic bytes (file signature) | 37 7A BC AF 27 1C |
| Developer | Igor Pavlov |
| Introduced | 1999 |
| Usually created by | 7-Zip |
| OpenAnyFile engine | libarchive WASM engine |
| Opens without upload | Yes — parsed locally in your browser |
Open a .7z file in your browser
OpenAnyFile routes .7z to its libarchive WASM engine, which opens a browsable listing of everything inside, decompressed in-browser by libarchive compiled to WebAssembly.
- Open the OpenAnyFile opener in this browser — nothing to download or sign up for.
- Drag your .7z file onto the drop zone, click to browse for it, or paste it with Ctrl+V.
- The extension is detected and the file is handed to the libarchive WASM engine.
- Your 7Z opens on its own viewer page: a browsable listing of everything inside, decompressed in-browser by libarchive compiled to WebAssembly.
- Use fullscreen for a closer look, or download the file back out unchanged. Nothing is transmitted anywhere — the parsing happens in your own browser process.
What you can and cannot do with it here
Does not work
Editing and re-saving. OpenAnyFile is a reader, not an editor — for changes you still need special software or an equivalent.
Local-only by design, not by promise
Plenty of sites promise they delete your uploads. OpenAnyFile avoids the promise by avoiding the upload. When you drop a .7z file in, the browser grants the page temporary read access to those bytes and nothing more — the page has no path to send them anywhere. You can verify it in seconds: open DevTools, switch to the network tab, and open a file. The request list stays empty.
Frequently asked questions about 7Z files
Can I open a .7z file without installing special software?
Yes. OpenAnyFile's libarchive WASM engine runs in your browser, so you can read a 7Z file with nothing installed. You get a browsable listing of everything inside, decompressed in-browser by libarchive compiled to WebAssembly. For full editing you still need the original application — this is a viewer, not an editor.
How can I check a file really is a 7Z file?
Look at the first bytes rather than the extension. A genuine 7Z begins with 37 7A BC AF 27 1C. Opening the file in OpenAnyFile shows that signature in the file-details panel, so a file renamed to .7z by mistake is easy to spot.
Is it safe to open a 7Z file online?
With OpenAnyFile, yes, because nothing is uploaded. The file is read locally through your browser's File API and never leaves your device, so there is no server copy to leak, log or retain. That matters most for the kind of file people are least willing to hand to a random converter site.
What is a .7z file, exactly?
7-Zip Archive — an application/x-7z-compressed format created by Igor Pavlov since 1999. Open format with LZMA2. It can encrypt filenames as well as contents, unlike standard ZIP where the file listing stays visible.
Does the same viewer handle formats related to 7Z?
Yes — the same engine also opens .iso, .rar, .cbr, so you can compare related files without switching tools.
Related formats
These open with the same engine, so if you have one of these sitting next to your .7z file, it will open too: