Install fonts in macOS Sierra
Use Font Book to add new writing styles to your applications
Your Mac comes with many dozens of fonts, but if you want to add extra flourish, you can install extra ones through the built-in app, Font Book.
Two of the most common font formats are TrueType and OpenType, and fortunately macOS – and, by extension, Font Book too – supports both. If you’re reading this guide, you’ll most likely have found a website offering fonts available for download, so make sure the site provides them in one of the supported types. Fonts are often protected by copyright in the UK and elsewhere, so make sure you have any necessary licence to use them.
Once installed, your new font should be available from the font menu in relevant apps. To send documents to another computer, make sure that the same font is installed there too, or else they may not display correctly.
If you get stuck, in Font Book choose File > Restore Standard Fonts to put macOS’s fonts back to their original state. Other fonts are disabled, but are easy to restore from ‘Fonts (Removed)’ in the systems and your user account’s Library folders.