What is a .woff file?
A .woff file is a WOFF font. Its registered MIME type is font/woff, which places it in the font family of formats.
WOFF stands for Web Open Font Format.
WOFF is a binary format: the contents are not readable text, so opening it in a text editor shows scrambled characters.
Files of this type usually begin with the bytes 77 4F 46 46. That signature is how programs recognise the format even when the extension is wrong or missing.
WOFF file format details
| Extension | .woff |
|---|---|
| Format | WOFF font |
| MIME type | font/woff, application/font-woff |
| Category | Font |
| Text or binary | Binary |
| File signature | 77 4F 46 46 |
| Registered with IANA | Yes |
| Other extensions | None |
How to open WOFF files
| Windows | Double-click the font file to preview it, then choose Install. |
|---|---|
| Mac | Double-click the font to open Font Book, then click Install. |
| iPhone and iPad | Fonts are installed through apps that provide them, or through a configuration profile. |
| Android | System fonts cannot be changed on most phones; apps that support custom fonts let you pick the file. |
Convert WOFF files
TapToConvert converts WOFF files in your browser, without uploading them. Open the WOFF converter, or go straight to a conversion:
WOFF file FAQ
What is a .woff file?
A .woff file is a WOFF font, with the MIME type font/woff.
How do I open a .woff file?
With the program that created it. The viewer on this page shows what is inside without installing anything.
Is a .woff file safe to open?
WOFF files hold data rather than programs, but any file from an unknown source can be crafted to exploit the software that opens it. Keep that software up to date. The viewer on this page only reads the bytes and never runs anything.
What is the MIME type of .woff?
font/woff, and it is also seen as application/font-woff. Web servers send this type so browsers know how to handle the file.
Is WOFF a text or binary format?
Binary. Its contents are not readable as text.
File type facts come from the IANA media type registry, the mime-db project and the freedesktop.org shared MIME database.