Font Type Checker

This tool analyzes font files or font URLs to determine how well a font supports the desired character set and how its metrics will affect rendering. Conceptually, it parses font tables to extract glyph mappings, ascent, descent, and units-per-em, then compares the font’s coverage against a target subset (e.g., Latin, Cyrillic, or multilingual blocks). It reports metrics quality and glyph availability in a structured format suitable for integration into build pipelines or QA checks. The value is twofold: it informs font selection decisions and provides a reproducible report that helps teams optimize typography across locales and browsers. Unique value lies in combined visibility of glyph coverage and metrics within a single analysis, plus an exportable JSON report for automated workflows. Core features include font_source handling (URL or file), font_family identification, scope selection (glyph_coverage, metrics, or both), and optional subset specification. Use cases span localization readiness, brand typography governance, and performance-oriented font optimization. The tool supports OpenType/TrueType and web font formats, and it maps results to Unicode blocks to highlight gaps that could trigger fallbacks. Outputs include coverage percentage, missing glyph counts, Unicode block coverage, and metrics (ascent, descent, line_height).