OpenAnyFile
What is a .a file?
Static Library Archive is an archive format developed by Unix toolchains, first released in 1971. It is usually created by ar, gcc, clang.
An ar archive of .o object files; the member list is browsable here.
File details
| Full name | Static Library Archive |
|---|---|
| Category | Archives |
| MIME type | application/x-archive |
| Signature (magic bytes) | 21 3C 61 72 63 68 3E (!<arch>) |
| Developer | Unix toolchains |
| Introduced | 1971 |
| Opens with | Archive browser |
| Uploaded? | No — read locally in your browser |
How to open a .a file
OpenAnyFile routes .a files to its archive browser, which shows every member file, browsable.
- Drop your .a file on the box above, click it to choose the file, or paste it with Ctrl+V.
- The real format is detected from the file's first bytes — not just its name.
- The file opens in the archive browser.
- Use fullscreen for a closer look, check its checksums, or download it back unchanged.
What works — and what does not
Works
Viewing and inspecting: every member file, browsable. Size, type, signature and checksums are always shown.
Does not work
Editing and saving back. OpenAnyFile is a viewer, not an editor — for changes you still need the original app.
Is it safe to open a .a file online?
Here, yes — because nothing is uploaded. Most "online viewers" send your file to their server. OpenAnyFile reads it with your browser's File API and decodes it on your own device, so there is no copy anywhere else. You can check: open your browser's network tab while opening a file — no upload appears.
Questions about .a files
Can I open a .a file without installing software?
Yes. OpenAnyFile opens .a files in your browser using its archive browser. You get every member file, browsable, with nothing installed and no account.
How do I know a file is really a .a file?
Check its first bytes instead of its name. A genuine A file begins with 21 3C 61 72 63 68 3E (!<arch>). OpenAnyFile shows the detected type, so a renamed file is easy to spot.
Is my .a file uploaded anywhere?
No. The file is read locally by your browser and never sent to a server — it even works offline once the page has loaded.
Does it work on phones?
Yes — on Android and iPhone, in any modern browser. You can also install OpenAnyFile as an app.
Related formats
Other formats from the same family:
Format facts checked and page updated on September 25, 2026.