Where does PowerPoint store custom theme fonts on a Mac?

In ~/Library/Group Containers/UBF8T346G9.Office/User Content/Themes/Theme Fonts/ — drop a theme fonts XML (fontScheme) file there and it appears under Design ▸ Fonts. Theme colors live in the sibling Theme Colors folder.

How do I add a custom theme font set to PowerPoint?

Generate a fontScheme XML naming your heading (major) and body (minor) typefaces, save it into the Theme Fonts folder, then choose it under Design ▸ Fonts. PowerPoint Matters writes the XML for you.

Do I need a plugin, add-in, or account?

No. The output is standard OOXML that PowerPoint reads natively. No add-in, sign-in, or macro is required, and nothing is uploaded — the tool runs entirely in your browser.

Can I change the twelve theme colors without editing the slide master?

Yes. A clrScheme XML defines all twelve theme colors (dk1, lt1, dk2, lt2, accent1-6, hyperlink, followed hyperlink). Save it to the Theme Colors folder and select it under Design ▸ Colors.

Why can't the preview show some fonts, like Calibri?

The in-browser preview can only render fonts the browser can reach, which is narrower than PowerPoint. “Not previewable” does not mean broken — PowerPoint may still have the font. In Chrome, “Load my installed fonts” widens the preview.

Does it work on Windows?

The XML it generates is standard OOXML and valid on Windows, but the install folder differs. PowerPoint Matters documents the macOS path.

Can I just write the PowerPoint theme XML myself?

Yes. A theme fonts (fontScheme) or theme colors (clrScheme) file is plain OOXML text, so you can hand-write it in any text editor such as TextEdit. It is tedious and error-prone — one malformed tag or wrong attribute silently breaks the theme. PowerPoint Matters writes valid XML in the correct order so it just works.

PowerPoint Matters — Custom Theme Fonts & Colors for Mac

I came, I saw, I made a theme

Bring in a mess, leave with order.Drop theme fonts or colors (.xml) to load

Font set

lt1

dk2Heading:

dk1Body:

hl1–2 designmatters.ws designmatters.ws

Color set

The twelve colors below drive the live preview and export as their own Theme Colors file.

Palette

Drop it here

~/Library/Group Containers/UBF8T346G9.Office/User Content/Themes/Theme Colors/

Drop it here

~/Library/Group Containers/UBF8T346G9.Office/User Content/Themes/Theme Fonts/

Can’t find it? In PowerPoint: Design → Save Current Theme opens Finder right at the folder.

How it works

Font names. PowerPoint binds a theme font to whatever name the system can resolve to an installed font. The menu groups weights under a typographic family (e.g. “Degular”), but a weight like “Degular Bold” can also bind when the font exposes that name. The top-level family is the most portable — bold is then applied in the master — and a weight-suffixed name may not survive on a machine with a different install.

The preview. It draws only fonts your browser can reach, which is narrower than what PowerPoint can use — Calibri, for instance, ships with Office but isn’t exposed to web rendering on a Mac. “Not previewable” doesn’t mean broken; PowerPoint may still have it. In Chrome, “Load my installed fonts” widens what shows here.

Doing it by hand. It’s all standard OOXML, so yes — you could open TextEdit and type the theme XML yourself. It’s also a pain in the butt, and one stray character breaks the theme. This just writes it clean, the way PowerPoint expects.