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TrueType is an outline font standard developed by Apple in the late 1980s as a competitor to Adobe's Type 1 fonts used in PostScript. It has become the most common format for fonts on the classic Mac OS, macOS, and Microsoft Windows operating systems.

Quick facts: Filename extension, Internet media type,...
Filename extension.ttf & .tte (for EUDC usage) for Microsoft Windows, .dfont for macOS
Internet media type
  • font/ttf
  • font/sfnt
  • application/x-font-ttf
  • application/font-sfnt (deprecated)
Type codeTFIL
Uniform Type Identifier (UTI)public.truetype-ttf-font
Developed byApple
Type of formatoutline font
Extended fromSFNT

The primary strength of TrueType was originally that it offered font developers a high degree of control over precisely how their fonts are displayed, right down to particular pixels, at various font sizes. With widely varying rendering technologies in use today, pixel-level control is no longer certain in a TrueType font.