Font Tester

Font Tester is a browser extension that lets you test fonts directly on any live website. Instead of guessing how a typeface will look in a final design, you can select text on a page and instantly apply different fonts from a library of over 1500 Google Fonts. It shows you the exact visual impact of your typography choices in the real context where they'll be used, eliminating the back-and-forth between design tools and the browser.

The tool works as a panel in your browser. You highlight text, and Font Tester provides a dropdown to swap fonts on the fly. It includes practical features like side-by-side comparison for evaluating multiple options, the ability to upload and test custom font files locally, and a CSS code generator to copy the styling for development. A key benefit is that it works on any site, allowing for accurate previews that match the final output.

This extension is most useful for web designers and developers who need to make precise typography decisions. It streamlines the process of rebranding a site, selecting a font for a new project, or demonstrating options to a client. Type designers can also use it to see how their custom fonts perform on various websites. It turns a typically abstract choice into a concrete, visual experiment.