Check subtitles
Find timing conflicts, damaged cues and hard-to-read lines before delivery.
Subtitle source
File contents stay in this browser. No account required.
Ready. Your text stays in this browser.
Result & preview
Errors and warnings are different
Invalid structure blocks exports in the other tools. Overlaps, line length and reading speed prompt a review; they do not prove that the captions are wrong.
What is counted
Reading speed counts Unicode code points including spaces, excluding line breaks and supported markup. The result is a practical indicator, not a speech or language model.
Read the whole report
The page shows up to 300 findings. Download the JSON report for every finding and the thresholds used.
Work through an example
Overlapping subtitles: find the conflict before changing the timing
Use a reproducible SRT example to distinguish a timing collision from deliberate simultaneous speech.
Read the guide →Practical guideReading-speed warnings are review settings, not a universal pass mark
Know how this checker counts characters and why a configurable threshold cannot replace watching the video.
Read the guide →