How to use Subtitle Checker
- Load or paste SRT/VTT text.
- Review syntax/timing issues plus heuristic readability warnings.
- Export a CSV issue report for correction workflows.
Subtitle Timing & Readability Checker
Check SRT/VTT captions for invalid timing, overlaps, very short/long cues, characters-per-second and long lines locally.
Or paste subtitle textUseful for quick edits without creating a temporary SRT/VTT file first.
Check SRT/VTT captions for invalid timing, overlaps, very short/long cues, characters-per-second and long lines locally. Controls expose the decisions that materially affect the result instead of hiding them behind a one-click preset.
How OpenFileTools processes it
Local processing, explicit choices.
Subtitle text is parsed and rewritten locally in the page. No subtitle text is sent to OpenFileTools, and external links inside captions are treated as inert text.
Questions, answered.
Is my media uploaded?
No. Source bytes remain on this device and are read directly by the browser. OpenFileTools does not receive the file.
Why can a recognized file still fail?
A container and the codecs inside it are separate. Browser decoder and encoder support varies by operating system and browser, so the tool checks the actual track rather than promising universal conversion.
Does processing change my original?
No. A separate result is created for preview or download; the selected source file is not modified.
Related guide
Read the related guide