Font ISO, WCAG checker - measure in MM

About this plugin

Fonts are designed in pixels, but people read them in the physical world — on a phone at 30 cm, a car display at arm's length, or a ship's bridge monitor 2 metres away. Measure Text converts your text to real-world millimetres and tells you instantly whether it's legible: PASS, MARGINAL, or FAIL.HOW IT WORKSSelect a text layer — measurement is live, no buttonsPick a standard preset and your target displayGet a verdict with the exact margin — and a one-click fix if it failsSTANDARD PRESETSGeneral — Mobile / Tablet / Desktop / TV: plain-language device presets based on ISO 9241-303 visual-angle ergonomics (≈20 arcmin at typical viewing distance)ISO 8468 — maritime bridge displays (3.5 mm per metre of reading distance)ISO 9241-303 — general display ergonomicsISO 15008 — automotive / in-vehicle displaysWCAG 2.2 (2.5.8) — target size, AA & AAA levelsApple HIG — minimum text size and 44 pt touch targetsMaterial Design 3 — 12 sp text and 48 dp touch targetsWeb best practice — 16 px body, Lighthouse's 12 px floorCustom — define your own mm-per-metre ruleFEATURESLive measurement of character cap height in mm — the value legibility standards actually regulate, not just the layer boxReading-distance input with pass / marginal / fail verdicts and the exact marginOne-click "Fix layer" — raises the failing text to the compliant size (only the runs that are too small, when sizes are mixed)Display profiles with device scale (iPhone 3×, iPad 2×…) so logical px map correctly to physical mm — plus custom profiles from resolution + diagonalHandles mixed text sizes, multi-line paragraphs, and non-text layers for target-size checksPlatform presets report in the native unit: pt, dp, or pxBuilt from real-world need: certifying maritime navigation UIs against ISO 8468, then generalised for every screen your designs ship to. If your text must be readable where it actually lives — not just on your monitor — this checks it.