How to restore default system fonts on Mac and fix display issues

▼ Key Takeaways

Garbled text and question-mark boxes usually mean a corrupted font cache. This is more common than you'd think, especially after a system crash or a messy third-party font install. The fix is straightforward: restart in safe mode, then clear the cache using Terminal with sudo atsutil database -remove.
Font Book's Reset Fonts option is the quickest way to restore Mac defaults. It moves third-party fonts to a "Fonts (Removed)" folder rather than deleting them, so you can bring any of them back later. No fonts are permanently lost in the process.
Third-party fonts are the most common cause of display issues. If you collect fonts, your library can quietly grow large enough to cause conflicts with system fonts. A periodic cleanup in Font Book keeps things stable.
For browsing and previewing fonts, Typeface is worth trying. It offers visual previews, Google Fonts integration, and side-by-side comparisons — everything Font Book doesn't have.
If you want to go further and create your own fonts, Glyphs Mini is the tool for that. It lets you design, edit, and export custom typefaces on Mac — from individual glyphs to full character sets. Also available through your Setapp subscription.

You probably don't think much about system fonts until something goes wrong. I learned this the hard way when my Mac started displaying weird characters instead of text — suddenly, every menu looked broken.

When this happens, you'll see those frustrating squares with question marks instead of actual text. The good news is that I've found a reliable way to fix this issue. Whether your fonts are corrupted, missing, or just acting up after a third-party install, you can restore your Mac’s default system fonts quickly. No advanced skills required.

Reset font database on Mac

If your menus and apps show garbled text, missing letters, or question-mark boxes, your font cache may be corrupted. Here's how to reset your Mac's font database using Terminal — this works on macOS High Sierra through Tahoe. Note: You'll need an administrator password.

To reset font database:

Shut down your Mac.
Power it back on while holding Shift to start in safe mode. In safe mode, your fonts should look normal.
Open Terminal (find it in Applications > Utilities).
Clear the font cache by typing:

sudo atsutil database -remove

5. Press Return. Then, enter your admin password > Restart your Mac by typing:

sudo shutdown -r now

6. Let your Mac boot normally.

Your fonts should now display properly, and the font database will rebuild automatically.

Reset default fonts on Mac

Most of the time, it's third-party fonts that cause display issues in various apps. I've also noticed that if you love collecting fonts as I do, your library can quickly get out of hand and eat up storage space.

You can resolve this by reinstalling fonts to the default settings using Font Book:

Open Font Book from Applications or via Spotlight search (Command + Space, type "Font Book").
From the menu bar, click Font Book > Settings.
In the Settings window, click the Advanced tab or button.
Locate the Reset Fonts option and click it.

5. Confirm by clicking Proceed (you may need to enter your admin password or use Touch ID).

6. Allow the process to complete: Third-party fonts will move to ~/Library/Fonts (Removed) or /Library/Fonts (Removed).

7. Restart affected apps (or reboot if needed) to apply changes.

To restore custom fonts, drag them from the "Fonts (Removed)" folder back into Font Book or double-click .ttf/.otf files and select Install.

Best Mac font editor: If you want to customize or create your own fonts, Glyphs Mini is a great place to start. It lets you edit every character, design icons, and export your results as a full font. Replace or tweak your default fonts with ease.

Glyphs Mini font editor app interface showing Latin alphabet glyph overview, available on Setapp

Best Mac font apps

Font Book covers the basics for managing your fonts, but if you're serious about typography, you'll probably want something with more features. Here’s a quick comparison of top Mac font apps:

App	Best for	Key features	Limitations
Font Book	Built-in management	Restore defaults, organize, preview, collections	Lacks advanced features
Typeface	Font browsing & preview	Visual previews, Google Fonts integration, side-by-side compare, dark mode	No editing/custom font creation
Glyphs Mini	Font editing & creation	Vector editor, export custom fonts, icon/logotype design	Learning curve, paid

Both Typeface and Glyphs Mini are included in Setapp's free 7-day trial.

Why do Mac fonts get corrupted?

Mac fonts typically get corrupted when third-party apps interfere with how macOS handles font files. Common causes include:

Conflicts between non-standard fonts and built-in system fonts
Damage to the font cache after a system crash or unexpected shutdown

When font corruption occurs, macOS can't read the correct font data and displays blank boxes or question marks instead of text. Fortunately, corrupted fonts are rarely permanently lost — you can fix most display issues by clearing your font cache or restoring your Mac's standard fonts using the methods outlined above.

Restore default system fonts on macOS: Final thoughts

Corrupted or missing fonts can make your Mac feel broken, but the fix is usually straightforward. Whether you reset the font database through Terminal or restore defaults in Font Book, you'll have your system looking normal again in minutes. And if you want to go beyond basic font management, Typeface gives you beautiful previews and Google Fonts integration, while Glyphs Mini lets you edit and create custom fonts from scratch.

Both apps are part of Setapp — a subscription that gives you access to over 270 powerful Mac apps for one flat fee. Try Setapp free for 7 days and see how the right tools can transform the way you work with fonts (and everything else on your Mac).

FAQ

Why do fonts get corrupted on Mac?

Most font glitches happen when a third-party font conflicts with a built-in one or when the font cache gets damaged after a crash or sudden shutdown. macOS then grabs the wrong file and shows blank boxes or question marks. The good news: your fonts are rarely lost, clearing the cache or restoring standard fonts (see steps above) usually puts everything back to normal.

What is the default system font on macOS?

Since OS X El Capitan, macOS has used the San Francisco family for menus, buttons, and other interface text. You can’t replace it, but you can pick any font you like inside your documents and most apps.

Where are system fonts stored on a Mac?

macOS keeps protected fonts in /System/Library/Fonts. Fonts that ship with apps live in /Library/Fonts. Anything you install yourself is saved ~/Library/Fonts inside your user folder.

Will restoring standard fonts delete my custom fonts?

No. Font Book moves extra fonts to a “Fonts (Removed)” folder. You can drag any of them back into Font Book later if you need them.

How can I tell if a font is system or third-party on my Mac?

Open Font Book, click the font, and check the sidebar. “System” means it came with macOS; “User” or a custom collection means you installed it. This quick check helps you spot fonts that might be causing trouble.