Tinkerfont

Tinkerfont, made by independent developer Mighil, is a browser extension that enables real-time font testing and inspection on live websites, letting users detect existing typefaces, swap them with alternatives, and preview changes before implementing them in code. It offers a right-click font inspector showing typography specifications, full-page font scanning with usage counts, and instant access to more than 1,900 fonts from Bunny Fonts. Tinkerfont includes the ability to upload custom font files in .woff2, .woff, .ttf, and .otf formats, scoped replacements limited to specific page elements, per-site rule persistence across sessions, and share functionality via generated links. It is available on both the Chrome Web Store and Firefox Add-ons marketplace, with documented privacy practices. Pricing is completely free to install and use; optional supporter contributions help fund development, but every feature is available without payment.