- Extension
- .sfd
- .g4
- Format
- Text
- Binary
- Category
- Font
- Fax
- Developer
- FontForge
- Computer Fax Systems (CFS)
- Description
- SFD (Spline Font Database) is the native, text-based source format of the FontForge font editor. It stores a font's glyph outlines, metrics, kerning, OpenType tables and editing state, so a font can be reopened and edited losslessly and then exported to TrueType, OpenType, WOFF or Type 1.
- Group 4 (G4) used for black and white lossless compression to maintain high-quality images, commonly used in TIFF format compression by fax machines. A picture is seen as black dots and lines on a blank page; the fewer the dots and lines are, the lesser the file size.
- MIME Type
- application/vnd.font-fontforge-sfd
- image/g4fax
