Caption reading-speed checker

Is your caption readable in the time it is on screen? Paste it and see, against the same conventions professionals use.

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MetricValueCommon guideline
Characters per second (CPS)—≤ 17–20 adult · ≤ 13 children
Words per minute (WPM)—≤ ~160–180 comfortable
Line length—≤ 42 chars/line, ≤ 2 lines
Duration—≥ 1 s, ≤ ~7 s on screen
Guidelines reflect widely used professional conventions (broadcast and major streaming style guides); individual platforms vary. Mechanics in the glossary: reading speed, CPS, line length, subtitle timing.

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