Subtitle checker · In your browser
Subtitle checker
Find malformed timestamps, overlapping cues, missing numbers and empty subtitles. Preview chosen repairs before downloading.
Drop a file here. Up to 5 MiB of UTF-8 text and 20,000 cues per file. Nothing is saved after reload.
How to use it
Your file, ready for its next step.
- Open your subtitles. Choose a file, paste SRT or VTT, or try the sample. No account needed.
- Choose your changes. Adjust the options and run the tool. Read any warnings before continuing.
- Check and download. Review the output and save a new file. Your original stays unchanged.
Worked example
Subtitle checker, in practice.
A cue ending at 00:00:02,000 followed by one starting at 00:00:01,800 has a 200 ms overlap. Trimming overlaps ends the first cue at 1.8 seconds.
Before you download
Repairs never guess unreadable words or timestamps. Unreadable blocks are listed separately; keep your original file.
These tools work with existing SRT and WebVTT files. If you need captions from audio, open the video caption editor instead. Files are limited to 5 MiB and 20,000 cues per input. Results stay in this tab until you copy or download them.
Questions
A few useful answers.
Can I fix overlapping subtitles?
Yes. Enable Trim overlaps to end each cue at the next later start. Cues sharing the same start remain for manual review.
Are my files private, and what are the limits?
Processing stays in this browser without an account. Each subtitle input is limited to 5 MiB of UTF-8 text and 20,000 cues. Session recording is disabled here. Closing or reloading the page clears your work.
From video to finished captions
Need the words first?
Generate captions, refine the timing and style your video in ClipSubtitles.