Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.WOFF
File Type
Web Open Font Format
Category
Data
Best first step
Use compatible software
Quick Summary
A practical overview of the .woff file format
The Web Open Font Format (WOFF) is a font format for use in web pages. It was developed to provide lossless compression of fonts, reducing file size and improving page load times. WOFF files contain font data, metadata, and private-use data. The metadata includes information about the font's licens…
File extension
.WOFF
File type
Web Open Font Format
Category
Data
Recommended action
Open with a trusted compatible app
How to open a .woff file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .woff.
- Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
- Update the application if the file was created by a newer version of the software.
- Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.
What is a .woff file?
File extension details and usage information
The Web Open Font Format (WOFF) is a font format for use in web pages. It was developed to provide lossless compression of fonts, reducing file size and improving page load times. WOFF files contain font data, metadata, and private-use data. The metadata includes information about the font's license, designer, and other relevant details. The compression algorithm used in WOFF is based on zlib, which is widely supported and efficient. WOFF fonts are typically used with the @font-face CSS rule, allowing web developers to embed custom fonts directly into their websites. This eliminates the need for users to have the fonts installed on their local machines, ensuring consistent rendering across different platforms and browsers. WOFF has become a widely adopted standard for web fonts, supported by all major browsers. Its successor, WOFF2, offers even better compression and is also widely supported. Using WOFF helps improve website performance and provides greater design flexibility by allowing the use of a wider range of fonts.
Software Compatibility
Programs that may open or work with .woff files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .woff files be converted?
Options for saving or exporting this file to another format
In many cases, a .woff file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.
- Use the original software that created the file when possible.
- Check whether the application supports exporting to common formats.
- Be careful with online converters when working with private, business, or sensitive files.
- If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .woff file.
Why can't I open a .woff file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .woff format.
Incorrect extension
The file extension may have been renamed manually, even though the actual file format is different.
Corrupted file
The file may be incomplete, damaged during download, or transferred incorrectly.
Outdated app
Your software may need to be updated before it can open newer versions of this file format.
Frequently Asked Questions
Common questions about .woff files
To open a .woff file, use software that supports this file format.
- Any modern web browser (Chrome, Firefox, Edge, etc.)
- FontForge
- BirdFont
- FontLab Studio
- Any modern web browser (Chrome, Firefox, Safari, etc.)
Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.
- Verify that the file extension is correct.
- Install or update compatible software.
- Try another application that supports this format.
- Check whether the file is corrupted, incomplete, or encrypted.
A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.
File safety tips
Use caution with unknown files
Only open files from trusted sources. Before opening a .woff file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.