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 .lzma file
If double-clicking a LZMA file did nothing useful, that is normal: the format is fine, your operating system just has no default application registered for it. This page explains the format and gives you a way to read one immediately.
What is a .lzma file?
LZMA Compressed File is an archive format developed by Igor Pavlov, first appearing in 1998. It is normally produced by 7-Zip, older Linux packages.
The algorithm behind both 7z and xz. The bare .lzma stream carries no real magic number and no integrity check, which is precisely why the xz container was created to replace it.
| Full name | LZMA Compressed File |
|---|---|
| File category | Archives |
| MIME type | application/x-lzma |
| Magic bytes (file signature) | 5D 00 00 |
| Developer | Igor Pavlov |
| Introduced | 1998 |
| Usually created by | 7-Zip, older Linux packages |
| OpenAnyFile engine | libarchive WASM engine |
| Opens without upload | Yes — parsed locally in your browser |
Open a .lzma file in your browser
OpenAnyFile routes .lzma 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 .lzma 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 LZMA 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. Works the same on Windows, macOS, Linux, Android and iOS, because it is just a web page.
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.
Your {ext} file stays on your device
The entire pipeline — detection, decoding, rendering — runs client-side. Your browser hands the bytes to a decoder compiled to WebAssembly, the result is drawn to the page, and that is the whole journey. No account is created, no file is stored, and no analytics event carries your filename. This is also why there is no size limit imposed by a server: the only ceiling is your own available memory.
Frequently asked questions about LZMA files
Can I open a .lzma file without installing special software?
Yes. OpenAnyFile's libarchive WASM engine runs in your browser, so you can read a LZMA 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 LZMA file?
Look at the first bytes rather than the extension. A genuine LZMA begins with 5D 00 00. Opening the file in OpenAnyFile shows that signature in the file-details panel, so a file renamed to .lzma by mistake is easy to spot.
Is it safe to open a LZMA 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 .lzma file, exactly?
LZMA Compressed File — an application/x-lzma format created by Igor Pavlov since 1998. The algorithm behind both 7z and xz. The bare .lzma stream carries no real magic number and no integrity check, which is precisely why the xz container was created to replace it.
Does the same viewer handle formats related to LZMA?
Yes — the same engine also opens .7z, .iso, .rar, 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 .lzma file, it will open too: