Font files contain one or more fonts that can be accessed by the operating system and applications. Most modern fonts are stored in either the OpenType or TrueType formats, which can be used by both Macintosh and Windows computers.
Common font file extensions include .OTF, .TTF, and .FNT.
| Extension | File Description | Popularity |
|---|---|---|
| .abf | Adobe Binary Screen Font File | Uncommon |
| .acfm | Adobe Composite Font Metrics File | Average |
| .afm | Adobe Font Metrics File | Rare |
| .amfm | Adobe Multiple Font Metrics File | Average |
| .bdf | Glyph Bitmap Distribution Format | Average |
| .cha | Character Layout File | Average |
| .chr | Borland Character Set | Average |
| .compositefont | Windows Composite Font File | Average |
| .dfont | Mac OS X Data Fork Font | Average |
| .eot | Embedded OpenType Font | Uncommon |
| .ffil | Mac Font Suitcase | Uncommon |
| .fnt | Windows Font File | Very Common |
| .fon | Generic Font File | Very Common |
| .fot | Font Resource File | Average |
| .gdr | Symbian OS Font File | Average |
| .lwfn | Adobe Type 1 Mac Font File | Uncommon |
| .mcf | Watchtower Library Font File | Rare |
| .otf | OpenType Font | Very Common |
| .pcf | PaintCAD Font | Rare |
| .pfa | Printer Font ASCII File | Average |
| .pfb | Printer Font Binary File | Average |
| .pfm | Printer Font Metrics File | Average |
| .pfr | Portable Font Resource File | Average |
| .sfd | Spline Font Database File | Average |
| .suit | Macintosh Font Suitcase | Average |
| .ttc | TrueType Font Collection | Average |
| .ttf | TrueType Font | Very Common |
| .txf | Celestia Font Texture File | Uncommon |
| .vnf | Vision Numeric Font | Uncommon |
| .woff | Web Open Font Format File | Common |
| .xfn | Ventura Printer Font | Average |
| .xft | ChiWriter Printer Font | Average |
