| 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. |
| File conversion | OTF conversion | TTF conversion |
| 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 |
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Install fonts
Double-click the font in the Finder, then click Install Font in the font preview window that opens. After your Mac validates the font and opens the Font Book app, the font is installed and available for use.
You can use Font Book preferences to set the default install location, which determines whether the fonts you add are available to other user accounts on your Mac.
Fonts that appear dimmed in Font Book are either disabled ('Off'), or are additional fonts available for download from Apple. To download the font, select it and choose Edit > Download.
Disable fonts
You can disable any font that isn't required by your Mac. Select the font in Font Book, then choose Edit > Disable. The font remains installed, but no longer appears in the font menus of your apps. Fonts that are disabled show ”Off” next to the font name in Font Book.
Remove fonts
You can remove any font that isn't required by your Mac. Select the font in Font Book, then choose File > Remove. Font Book moves the font to the Trash.
Learn more
macOS supports TrueType (.ttf), Variable TrueType (.ttf), TrueType Collection (.ttc), OpenType (.otf), and OpenType Collection (.ttc) fonts. macOS Mojave adds support for OpenType-SVG fonts.
Ttf Format Spec
Legacy suitcase TrueType fonts and PostScript Type 1 LWFN fonts might work but aren't recommended.