Fontsight
Identify rendered fonts on any page and copy ready-to-use CSS
Fontsight is a browser extension that identifies the exact typeface rendered on a webpage and provides the CSS to use it. Point at text to see the font, weight, size, foundry, and which fallbacks were skipped. Then pin a card and copy the styles. It lets you swap and test fonts in place, including installed fonts, Google Fonts, or your own files, and offers a directory of over 7,900 families from major foundries. Fontsight is free and works in Chrome, Edge, and Brave.