Check SRT or WebVTT Subtitle Timecode Errors

How to use it

Paste SRT or WebVTT subtitle text and check basic timing issues while counting recognized cues. It flags an end time that is not later than its start, overlaps with the previous cue, and a missing WEBVTT header when VTT is selected.

1. Choose Auto, SRT or WebVTT and paste the subtitle text.
2. In Auto, text beginning with WEBVTT is treated as VTT; everything else is treated as SRT.
3. Review the cue count and reported timing issues, then correct the source subtitle.

Timing

start must be earlier than end

Overlap

warns when the next start is before the previous end

WebVTT

checks for leading WEBVTT

Scope

basic timing check, not a complete subtitle-spec validator

A cue beginning at 00:00:03,500 overlaps one that ends at 00:00:04,000

It does not fully validate SRT sequence numbering, every WebVTT grammar rule or markup inside cue text. Treat a clean result as “no basic timing issue found,” not as certification that every platform will accept the file.