Web Open Font Format (WOFF) is a file format for web fonts developed by Mozilla. A WOFF file can contain compressed TTF and OTF files, as well as license information and other metadata. Here's what you need to know about WOFF.
Similar to ZIP files, WOFF files act as containers for other files, specifically TrueType Font (TTF) and OpenType Font (OTF) files. These types of files allow web designers to use fonts outside of the standard characters found on most computers.
WOFF has been replaced by the WOFF2 format. WOFF2 offers even better compression algorithms, which reduce the original file size by another 30 percent. Therefore, WOFF2 files take up less bandwidth and load even faster. WOFF files have the extension .woff, while WOFF2 files have the extension .woff2.
Virtually all web pages use Cascading Style Sheets (CSS) to define the layout of HTML and other elements on your screen. For example, developers can use CSS to modify web fonts by referencing fonts already installed on the user's computer. However, if your PC or browser doesn't support a font, it will either be displayed as a different font or won't load at all, depending on how the page's font stack is configured.
