A designer friend and I made ffffallback.com for testing fallback fonts

In plain words

Ffffallback is a tool for web designers to select appropriate fallback fonts that maintain design integrity when web fonts fail to load. Users can test how their designs degrade across different typefaces using a bookmarklet that works in Chrome, Safari, and Firefox. The tool helps ensure websites remain visually coherent even when primary fonts are unavailable.

written from the facts on this page · September 2026

From the sources

It's a brave new world. Web fonts are here, sparking an exciting new era in web design. Ffffallback makes it easy to find the perfect fallback fonts, so that your designs degrade gracefully. * Small caveat: this bookmarklet only works on webkit browsers (Chrome & Safari) or Firefox. We might get it working for IE and Opera if time permits. But I wouldn't hold your breath. For more background on how this came to be and why it's important, read Type study: Choosing fallbackfrom ffffallback.com

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