See the problem. Try the fix.
A short, invented subtitle track shows what a final technical review catches. Open the demo to follow along. No file or account needed.
Overlapping subtitles
In the demo, caption 2 ends at 00:00:05,000 while caption 3 starts at 00:00:04,850. They overlap for 150 milliseconds. That can make both captions appear at once.
Listen to the video before changing either boundary: overlapping dialogue may be intentional. Select the affected caption, edit its start or end, then Save and recheck. Automatic cleanup leaves timings alone.
Subtitles that disappear too quickly
Caption 2 contains “Sometimes, it is easy to miss.” and lasts only 0.8 seconds. Its 29 visible characters require about 36 characters per second, above the starting limit of 20.
Check the spoken dialogue and surrounding captions. You may need more screen time or a carefully shortened translation. Adding a line break improves layout but does not reduce reading speed. Change Rules to match the language and delivery requirements.
Long lines and safe cleanup
Caption 4 has a long single line. Suggest a line break previews a word-preserving split; review the result before saving. Caption 3 has extra spaces, and the source numbering jumps from 3 to 7. Preview safe fixes shows whitespace and numbering repairs before applying them. Undo is available.
Compare different subtitle segmentation
The English first caption runs from 1 to 4 seconds. The Arabic example divides that interval into two captions. Matching by cue number would be misleading; CaptionCheck groups overlapping intervals and shows coverage for both tracks.
Later, the Arabic example omits an interval and changes another boundary. Review those groups against the video. Timing alignment does not prove a translation is correct.
Convert SRT to VTT, or VTT to SRT
Open a track in Convert, choose Export, then select the desired format. SRT timestamps use commas; WebVTT uses periods and a WEBVTT header. Text and timestamps are kept. WebVTT positioning, identifiers and style metadata cannot all survive conversion to SRT; the tool asks you to acknowledge that loss.
A useful final-pass routine
- Correct red errors and malformed source blocks.
- Inspect amber timing and readability findings with the video.
- Preview blue cleanup suggestions.
- Export reviewed subtitles and, if needed, a quality report.
Green means no findings under your current rules. It is not delivery certification. Files stay in your browser; export before closing the tab. See the complete guide for limits and shortcuts.