# Fontconfig Font configuration and customization library [[_TOC_]] ## About Fontconfig Fontconfig can: * discover new fonts when installed automatically, removing a common source of configuration problems. * perform font name substitution, so that appropriate alternative fonts can be selected if fonts are missing. * identify the set of fonts required to completely cover a set of languages. * have GUI configuration tools built as it uses an XML-based configuration file (though with autodiscovery, we believe this need is minimized). * efficiently and quickly find the fonts you need among the set of fonts you have installed, even if you have installed thousands of fonts, while minimizing memory usage. * be used in concert with the X Render Extension and [FreeType](https://www.freedesktop.org/wiki/Software/FreeType/) to implement high quality, anti-aliased and subpixel rendered text on a display. Fontconfig does not: * render the fonts themselves (this is left to FreeType or other rendering mechanisms) * depend on the X Window System in any fashion, so that printer only applications do not have such dependencies ## Documentation * [Fontconfig User Documentation](https://www.freedesktop.org/software/fontconfig/fontconfig-user.html) * [Fontconfig Developer Documentation](https://www.freedesktop.org/software/fontconfig/fontconfig-devel/) ## Bug report If you have cncountered any issues regarding to Fontconfig, please file an issue at [GitLab issue tracker](https://gitlab.freedesktop.org/fontconfig/fontconfig/issues)