Why Netflix caps subtitles at 17 characters per second — readable captions, by the numbers.
Validate SRT/VTT subtitles against the Netflix Timed Text Style Guide: 17 CPS (adult), 42 characters per line, 2 lines, 5/6 s to 7 s duration.
A general subtitle QC pass — characters-per-second, line length, overlaps and durations — for when you just need clean, readable subtitles to no specific platform.
Validate subtitles against BBC Subtitle Guidelines: ~160–180 wpm reading speed, max 37–40 characters per line, 2 lines.
Analyze any SRT/VTT for cue count, reading-speed distribution, longest lines and total duration — a quick health snapshot before delivery.
Convert an SRT or VTT subtitle file to clean WebVTT for HTML5 video, with correct timestamp formatting and a valid WEBVTT header.
Automatically fix overlapping cues and enforce a minimum inter-cue gap (e.g. 2 frames) so subtitles never collide — a one-click cleanup before delivery.
Every tool on ToolJolt is free, runs in your browser and needs no sign-up.