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Limitations: TrueType and OpenType only: Download Now: Got a font collection? Got a collection, but no order in it? Start by giving font files the names corresponding to the full font names. For example, you can rename MLONI.TTF to Milion Italic.ttf. This name speaks for itself, it is simple and clear. The.otf file extension is used as an OpenType Font file wherein this font type. It is a combination of font formats such as TrueType and Postscripts. FontForge for Mac. Be careful not to rename the extension on.otf files, or any other files. Only special conversion software can change a file from one file type to another.

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.

Legacy suitcase TrueType fonts and PostScript Type 1 LWFN fonts might work but aren't recommended.

A: It would be nice if Macintosh and Windows only used the same type of font files. Unfortunately, this is not always the case. Even though most font formats are 'crossplatform,' they often need to be converted to work on both platforms.

The following are the three most popular font formats:

1. TrueType - .TTF file extension. TrueType was developed by Apple but is also supported by Microsoft Windows. This font format has been around since the 1980s and is the most common type of cross-platform font. Mac TrueType fonts only work on the Mac, while Windows TrueType fonts work on Windows and Mac OS X. Therefore, a Mac TrueType font will need to be converted to the Windows version in order for it to work in Windows.
2. OpenType - .OTF file extension. OpenType font files are also cross-platform and are based on the TrueType format. They merge all the necessary components required for Macintosh and Windows files into a single file. The Macintosh components (which includes the .AFM file) and the Windows components (.PFB and .PFM files) are all included in an OpenType font file, which means you can install and use the same font file on both Windows and Macintosh computers. For more information on OpenType fonts, view Adobe's Introduction to OpenType.
3. PostScript - Mac: .SUIT or no extension; Windows: .PFB and .PFM. This format was developed by Adobe and is used to ensure accurate representation of fonts both on screen and in print. Mac OS X includes native support for PostScript Type 1 fonts, while Windows XP may require additional software or drivers to fully support all PostScript fonts. Because there are Mac PostScript and Windows PostScript font files, the same file will not install on both platforms.

Of the above font types, only the OpenType font format includes all the necessary files to be used on both Macintosh and Windows platforms. Mac OS X will recognize most Windows TrueType and PostScript fonts without requiring conversion. Mac OS 9, on the other hand, will not install most Windows fonts. Windows will only recognize Mac TrueType and PostScript fonts in Windows if they are converted using a program such as CrossFont.

Updated: June 15, 2011