TTX (FontTools)

TTX is a tool from the FontTools library that converts font files into an editable XML format. This allows font designers and developers to review, modify, or troubleshoot font data—such as characters, metrics, and layout information—using a human-readable document. Essentially, TTX makes complex font files transparent and accessible, facilitating customization and quality control without needing specialized software. Once edits are made in XML, the file can be converted back into a standard font format for use. It streamlines the process of font editing and analysis in a flexible, text-based environment.