Tinkerfont is a free Chrome add-on designed for font inspection and experimentation on live websites. It allows users to quickly identify and replace fonts currently in use, making it an essential tool for designers and developers. With features like the right-click font inspector, users can detect fonts on any webpage, replace them with options from Bunny Fonts, or upload their own custom fonts for instant testing. The add-on supports scoping changes to specific areas of a page, ensuring that typography can be evaluated in context without the need for complex setups.

Among its notable features, Tinkerfont offers the ability to save font rules per website hostname and import/export settings across different browsers. It also works seamlessly on many CSP-restricted sites, automatically applying changes on dynamic pages. With a collection of 1959 fonts and support for light and dark modes, Tinkerfont simplifies the process of typography experimentation, enabling users to enhance readability and test brand fonts directly on staging or production sites.