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# Font Tools
Font Tools is a GPL-3.0-or-later, local-first browser workbench for inspecting
TTF, OTF and WOFF fonts. It inventories SFNT tables, names, metrics, Unicode
coverage, variable axes and OS/2 embedding restrictions; previews arbitrary
text against local fallbacks; generates inert CSS; and can rebuild a deliberately
simple static outline subset when the machine-readable restrictions permit it.
TTF, OTF, TTC, OTC, WOFF and WOFF2 fonts. It inventories SFNT and OpenType-layout
tables, names, metrics, Unicode coverage, variable axes and OS/2 embedding
restrictions; provides a browser shaping/comparison lab; generates inert CSS;
and can rebuild a deliberately simple static outline subset when
machine-readable restrictions permit it.
Files never leave the browser. Parsing and subsetting run in a disposable worker
with an 8-second operation limit. Preview rendering is contained in a scriptless
sandboxed frame. WOFF2 is detected but not parsed in v0.1.0.
sandboxed frame. WOFF2 inspection uses Fontkit's pinned browser build and local
Brotli decoder under the strict no-`unsafe-eval` CSP; it never calls a
conversion service. TTC/OTC 1.0 and 2.0 headers, up to 64 unique aligned face
offsets, every selected SFNT directory and optional DSIG boundaries are
validated before Fontkit exposes the face list. Selecting a face rebuilds a
bounded standalone SFNT only for the sandboxed in-memory preview.
Limits: 16 MiB input, 64 MiB declared expanded SFNT size, 128 tables, 65,535
glyphs, 250,000 Unicode mappings, 20,000 preview characters and 1,024 subset
glyphs. Suspicious WOFF ratios and invalid table bounds are rejected before the
font library sees the data.
WOFF2 and collection static subset export remain disabled until those paths can
preserve the same source-metadata guarantees as the SFNT/WOFF writer. Font
Tools does not export a selected collection face or rebuild TTC/OTC containers:
shared tables, face ordering and DSIG data would require a dedicated
round-trip-safe writer. Generated collection CSS uses `format("collection")`,
but CSS cannot portably address the selected face by numeric index; verify
family/style matching or deploy an authorized standalone face prepared by
suitable tooling.
Limits: 16 MiB input, 64 MiB declared or reconstructed SFNT size, 64 collection
faces, 128 tables per face, 65,535 glyphs, 250,000 Unicode mappings, 20,000
preview characters and 1,024 subset glyphs. Suspicious WOFF ratios, invalid
WOFF2/TTC declarations and SFNT table bounds are rejected before the font
library sees the data. Shaping comparisons use the browser engine and therefore
reflect that browser rather than a portable HarfBuzz reference result.
Run `npm ci`, then `npm run check`, `npm run test:browser`, and
`npm run package:release -- --force`. Copyright © 2026 Albrecht Degering.