OpenAnyFile
What is a .odf file?
OpenDocument Formula is a document format developed by OASIS, first released in 2005. It is usually created by LibreOffice Math.
Holds a single equation as MathML inside a ZIP, with a rendered thumbnail.
File details
| Full name | OpenDocument Formula |
|---|---|
| Category | Documents |
| MIME type | application/vnd.oasis.opendocument.formula |
| Signature (magic bytes) | 50 4B 03 04 (ZIP) |
| Developer | OASIS |
| Introduced | 2005 |
| Opens with | Package preview reader |
| Uploaded? | No — read locally in your browser |
How to open a .odf file
OpenAnyFile routes .odf files to its package preview reader, which shows the preview image stored in the package, plus every file inside.
- Drop your .odf 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 package preview reader.
- Use fullscreen for a closer look, check its checksums, or download it back unchanged.
What works — and what does not
Works
Viewing and inspecting: the preview image stored in the package, plus every file inside. Size, type, signature and checksums are always shown.
Does not work
Editing layers or the raw data. You see the preview image stored in the file, not an editable document.
Is it safe to open a .odf 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 .odf files
Can I open a .odf file without installing software?
Yes. OpenAnyFile opens .odf files in your browser using its package preview reader. You get the preview image stored in the package, plus every file inside, with nothing installed and no account.
How do I know a file is really a .odf file?
Check its first bytes instead of its name. A genuine ODF file begins with 50 4B 03 04 (ZIP). OpenAnyFile shows the detected type, so a renamed file is easy to spot.
Is my .odf 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.