FGM Editor

About This Tool

FGM Editor is a domain-focused tool that handles per-glyph metric data for font design work. It accepts structured data for multiple glyphs, validates fundamental relationships between advance width, bounding boxes, and bearings, and supports batch edits to speed font production. Conceptually, users supply glyph_id, advance_width, and bounding box coordinates; the tool derives or confirms left and right side bearings and ensures internal consistency. Benefits include reduced manual errors, easier bulk corrections, and clean data export for font pipelines. Core features include data import/export (JSON/YAML), automatic bearing calculation when missing, and cross-glyph integrity checks. Use cases include correcting inconsistent metrics across a new font, preparing a glyph set for export, and aligning metrics to a target UPM. Unique value lies in its focused handling of glyph-level numeric data without touching outlines or kerning. Core capabilities are designed for font engineers and type designers who need reliable, auditable metric edits with deterministic rules and clear diagnostic outputs. Typical workflows involve importing a glyph set, applying batch adjustments (e.g., increasing all advance widths by a constant), validating with auto-balance, and exporting the updated data for downstream tooling.

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