OpenType Font TTF OTF

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TTF, OTF, OTC, TTC, WOFF

• Format Type : Font
  
• Endian Order : Big Endian
  
• Signature : OTTO / 0x00010000 / wOFF
  

Format Specifications

// TTF/OTF file format

// big endian

// tables directory
4 bytes (uint32) - sfntVersion // "OTTO" - OpenType fonts containing CFF data (version 1 or 2)
                               // 0x00010000 (65536) - OpenType fonts that contain TrueType outlines
2 bytes (uint16) - number of tables
2 bytes (uint16) - search range
2 bytes (uint16) - entry selector
2 bytes (uint16) - range shift


// table records
number_of_tables *
{
   4 bytes (char) - table signature  // e.g. "FFTM" or "GDEF"
   4 bytes (uint32) - table checksum
   4 bytes (uint32) - table offset
   4 bytes (uint32) - table size
}


// table data
number_of_tables *
{
   x bytes - table data
   x bytes - padding
}

// WOFF file format

// header
4 bytes (char) - signature  // "wOFF" - Web Open Font Format
4 bytes (uint32) - "sfnt version" of the input font.  // "OTTO" or 0x00010000
4 bytes (uint32) - total size of the WOFF file
2 bytes (uint16) - number of entries in directory of font tables
2 bytes (uint16) - reserved
4 bytes (uint32) - total size needed for the uncompressed font data

// TODO

MultiEx BMS Script

Not written yet.

Notes and Comments

• File format is table based. Some of the table signatures are "DSIG", "GDEF", "GPOS", "0CFF", "FFTM", "cmap", "head", "OS/2", "GSUB", "glyf".
  • Full list of tables is listed here.
• Every Pure TrueType font is OpenType font, but not every OpenType font is Pure TrueType font.
• Pure TrueType fonts are legacy and should be avoided.
• WOFF is basically a container for OTF/TTF with metadata and compression supported by all major browsers.

Games

List of games using this file format:

• Changeling (*.TTF) (PC)
• Doki Doki Literature Club! (*.TTF) (PC)
• Mindustry (*.WOFF \ *.TTF) (PC)
• Nina Aquila: Legal Eagle, Season One (*.TTF) (PC)
• Project Kat (*.TTF) (PC)
• Rigs of Rods (*.TTF) (PC)
• State of Decay 2 (*.TTF) (PC)
• SuperTuxKart (*.TTF \ *.OTF) (PC)
• many more...

Compatible Programs

• Glyphr Studio Online / Glyphr Studio Desktop
• High-Logic FontCreator
• High-Logic MainType
• Windows Font Viewer (fontview.exe)

See Also

• OpenType (Wikipedia)
• OpenType file format (Microsoft docs)
• The difference between TrueType and OpenType fonts
• WOFF file format (W3C)

Gallery

• 

  Windows Font Viewer

• 

  High-Logic FontCreator