Inspect local font glyph coverage, metrics and safe outlines.
Your input
Outputs are cleared when the input changes.
Result
Enter your data or use the example, then run the tool.
Worked example
Load the generated sample font: A is present and B is missing. No third-party font is redistributed by the sample.
Method
opentype.js parses the uploaded font locally and reports glyph indices, advance widths and pair kerning in font units. Preview draws simple monochrome outlines; embedded SVG/color layers are disabled.
Limits
One TTF/OTF/WOFF ≤10 MiB; expanded table data ≤20 MiB / 200 tables / 60,000 glyphs; text ≤100 code points. WOFF2 and font collections unsupported. No complete shaping or variable/color-font guarantee. Outlines are a simple per-character view, not a kerning/shaping preview. Your font license governs any exported outlines; no font download service is provided.
All work stays in this browser. Each disposable worker is terminated after 2.5 seconds or cancellation. Inputs and processing logs are not sent to analytics.
Your inputs stay on this device. Only optional, consented page visits are measured. Input values, files, filenames and processing logs are not sent to Analytics.
When switching languages, text, settings and selected files are temporarily kept on this device. Transfers are removed after restoring; interrupted transfers are cleaned up on a later visit. Inputs and files are never uploaded.