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| Name | OTF | TTF |
| Full name | OTF, OpenType Font | TTF - TrueType font file |
| File extension | .otf | .ttf, .tte, .dfont |
| MIME type | font/ttf | |
| Developed by | Adobe & Microsoft | Apple Computer |
| Type of format | Misc | outline font |
| Description | The OTF file is most commonly associated with computer fonts. It was developed by both Adobe and Microsoft and has been introduced to Mac OS X and Windows 2000. This OpenType Font format is similar to the TTF (TrueType Font) format. What sets the OTF format apart from other font file formats is that it is scalable. | TrueType is an outline font standard developed by Apple and Microsoft 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 both the Mac OS and Microsoft Windows operating systems. |
| Technical details | Similar to TrueType Font files, the OTF format also contains aspects of the equaly popular PostScript format, creating a single file that combines aspects of both. OTF files have several major advantages. They are fully scalable and can thus be resized without any loss in quality. Furthermore, they contain a new line and typographic layouts with the already known technology of TrueType and PostScript. | 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. |
| Associated programs | AMP Font Viewer (Windows), Apple Font Book (MAC), FontForge (Windows, MAC & Linux), Microsoft Windows Font Viewer (Windows) | Microsoft Windows Font Viewer, Mac OS X Font Book, IrfanView, ImageMagick, FontForge |
| Wiki | https://docs.microsoft.com/en-us/typography/opentype/ | https://en.wikipedia.org/wiki/TrueType |