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Bulletproof

Bulletproof Font Tester is a font proofing app that loads user-selected local font files and detects their OpenType features and variation axes. Everything is processed locally in the browser, using OpenType.js.

Available formatting options:

  • Changing font size, line height, text alignment, text case transform, text and background colors.
  • Toggling OpenType features on and off.
  • Choosing localization language from the list of languages built into the font.
  • Manipulating OpenType Variation axes.

Text collection

A set of multilingual texts is collected in a separate project Language-Data. It includes a few kinds of texts:

  • ordinary sentences,
  • pangrams,
  • lettering samples — defined as sets of A-Z words preferably repeating the initial letter within),
  • gotchas — edge cases characteristic to the given language, things to look out for when desigining a typeface.

The selection of languages and texts is arbitrary and limited, but contributions are welcome. Currently the focus is on languages written with Latin and Cyrillic.

Kerning tester

The app is equipped with a kerning string generator, along with a couple of predefined kerning patterns. See kerning generator help.

Playground & Animation

Any open text sample can be edited. In the editor tab some more options are available: setting bold and italic (with separately selectable fonts), as well as taking snapshots of the settings and using them as animation keyframes — can be useful for recording gifs or videos, or toggling multiple features on and off more quickly. See animation editor help.

Development

Last tested in Node.JS v12.22.12.