TTF Merger

This tool ingests two or more TrueType Font (TTF) files and outputs a single merged font file. It is designed for font studios, developers, and brands that need to consolidate weights (Regular, Bold, Italic) or separate family members into one distributable asset for web, apps, and documentation. It does not process variable fonts or CFF/OTF variants.

Conceptually, the workflow parses the SFNT structure, validates key metrics (unitsPerEm, number of glyphs), and merges glyph data by remapping glyph IDs to avoid collisions. It combines cmap subtables using best-fit platform mappings, then rebuilds essential tables (head, hhea, maxp, post) and recalculates checksums. The result is a coherent, production-ready TTF with a single, consistent glyph set.

Who benefits: font studios consolidating families; product teams shipping typography bundles for web and mobile; game developers packaging multiple weights for in-game UI; localization teams preparing shared assets across locales. The tool enforces a conservative merge that preserves licensing notices when present and minimizes risk by validating compatibility between inputs before proceeding.

Core features include input validation, conflict resolution, and optional subseting by Unicode ranges. Optional advanced features add Unicode-range subseting, license notice retention, and automatic family renaming to reflect the merged origin. Outputs include a binary TTF, a change log, and a manifest describing compatibility notes. It aims for a deterministic result across platforms.