Tinkerfont

Tinkerfont is a browser extension (for Chrome and Firefox) that lets you inspect, replace, and test fonts on any live website.

Our verdict

Who it's for

Inspect, replace, and test fonts live on any website

Who should look elsewhere

Limited to Chrome and Firefox; other Chromium browsers may work but are not officially tested.

+No account, no data collection, and fully free to use.
+Works on most live websites even with strict font policies by inlining fonts as data URLs.
+Export and import rules as JSON for easy setup across browsers.

−Limited to Chrome and Firefox; other Chromium browsers may work but are not officially tested.
−Custom font rules require re-uploading font files on a new device after import.

✓Right-click font inspector to view family, size, weight, color, contrast, and experimental font file URL.
✓Scan the live DOM to list all fonts in use with usage counts.
✓Swap fonts instantly from 1,900+ Bunny Fonts or custom uploaded files.
✓Scope font replacements to specific page elements (e.g., nav, table).
✓Rules saved per hostname in local storage for consistent testing across sessions.

No public pricing plans recorded.