The user can view the list of fonts and see their alphabets, their complete repertoire of characters, and how they set a sample text of the user's choice.

[1] The program allows users to:[1][2] It does not feature any editing tools, even for changing font properties.

This means that it cannot be used to rename, merge, or split up fonts or to redesign or modify fonts by (for example) changing kerning rules or exporting small capitals into a separate style.

[citation needed] Until 2007, Apple's Font Book faced some criticism for its inability to validate and auto-activate fonts.

[3] These features were added to Font Book with the release of Mac OS X Leopard on October 26, 2007.