A font previewer lets you see exactly how a typeface renders before you install it on your system or licence it for a project. This tool reads a .ttf, .otf, .woff, or .woff2 file you choose and registers it temporarily in the page, then sets a pangram, the full alphabet, numerals, and your own custom text in that font. Designers comparing weights, developers checking a web font, and anyone who downloaded a free font and wants a quick look will find it faster than installing first.
How it works
The browser exposes the CSS Font Loading API. When you pick a file, the tool reads its bytes with a FileReader, wraps them in a FontFace object, calls .load(), and adds the resolved face to document.fonts. Once the promise resolves, any element styled with that font family name renders in your font.
The key point is that registration is page-local: the temporary family lives only in this tab’s document and is removed when you load another file or close the page. Nothing is uploaded, so the preview works completely offline and keeps unreleased or licensed fonts private.
Tips and notes
- If a font does not render, it may be a corrupted file or an unsupported container — try re-exporting it as TTF or OTF.
- Variable fonts load, but this preview shows the default instance; use the size slider to judge display versus body legibility.
- Compare a candidate body font at 16–18px and a heading font at 32–48px to judge real-world use, not just at one size.
- The custom text box is the best test: type the actual words your project uses, including any tricky letter pairs.