Timing quality check
Subtitle Sync Checker
Inspect the internal timing of an SRT track before publishing. The checker finds cue overlaps, end times that precede start times, and captions held onscreen for more than ten seconds.
Start with 3 free minutes
Need to Create Subtitles First?
Upload your video to CapsAI, generate editable AI subtitles, and start with 3 free minutes.
Tool workspace
No account required · processed locally
Three steps
How this tool works
- 1
Paste or open the SRT track.
- 2
Run structural checks across adjacent cues.
- 3
Use the issue list to repair the source file.
Useful for
Common workflows
- Pre-publish caption QA
- Vendor subtitle review
- Diagnosing failed subtitle imports
What it checks
Focused, transparent output
- Overlapping cues
- Invalid cue duration
- Long onscreen captions
Questions
Frequently asked questions
Does this compare captions with the video audio?
No. It checks timestamp structure inside the subtitle file, not speech alignment.
Is an overlap always wrong?
Most single-speaker subtitle workflows avoid overlaps, but intentional multi-position captions may use them.
Can the checker repair issues automatically?
It reports exact cue numbers so you can make intentional corrections without changing dialogue unexpectedly.