Web Open Font Format — Compressed web font format.
Quick facts
What is .woff
A .woff file is a Web Open Font Format — Compressed web font format.
In the mime-db registry it maps to font/woff. When serving .woff over HTTP, set the Content-Type header as shown in Developer info below.
Related entities: it maps to font/woff — and is delivered over HTTP via the Content-Type header.
How to open .woff files
Developer info
When served over HTTP, responses should set the following header:
Content-Type: font/woff
Common software that reads/writes .woff:
Relation chain
Related extensions
Related MIME types
Common uses
How to edit .woff files
How to create .woff files
Frequently asked questions
Common options include Browser, Font Squirrel. You can also open many of these files with built-in viewers or a browser.
Create a new file in any text editor or the app that owns the format and save it with the .woff extension.
font/woff is the media type identifier used for .woff files during network transfer (for example in the HTTP Content-Type header).
Sources & standards
Updated 2026-08-18
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