The Font Book application lets you install, remove, view, organize, validate, enable, and disable fonts. Fonts are styles of type that your computer uses to display and print text. OS X comes with many preinstalled fonts.
Font Book is located in the Applications folder (in the Finder, choose Go > Applications). To manage or view fonts, open Font Book, or double-click a font file.
In Font Book, the Collection column on the left shows installed fonts by category; click a different category to see different kinds of fonts, or click "All Fonts" for a list of all installed fonts. The Font column in the middle displays all fonts within the selected collection. The preview pane on the right side displays a sample of characters in the selected font.
To preview a new font that you downloaded or have on a disc, double-click the font file. Font Book will display a sample of the font. You can change the typeface (if others are available) via the pop-up menu at the top of the preview window.
If you want to install the font so that it can be used in documents you create or view, click the "Install Font" button that appears below the preview of the font. You can also use Font Book to install one or more fonts. Choose Add Fonts from the File menu, select the font or a folder containing multiple fonts, then click Open to install the font(s). When Font Book installs a font, it will automatically validate the font and let you know if it detects any issue with the font file. See the "Validating fonts" section in this article for more information. By default, Font Book will install fonts in a location where the font will only be available to the current user account. If you'd prefer to install fonts in a location where they will be available to all users on the computer, choose Font Book > Preferences, then choose "Computer" from the "Default Install Location" pop-up menu.
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