Captions
Subtitle readability checker
Find overlapping captions, invalid times, long lines and fast reading speeds.
Up to 2 MB of caption text. Review each caption against the recording.
Before you use the result
Caption editing and checks run on your device. Translation sends caption text to our AI service when you choose Translate.
Reading-speed and line-length checks flag captions to review. They do not certify accessibility or verify the words against your audio.
Related guides
Fix subtitles that are early or late
Distinguish a constant offset from drift and individual cue errors before changing timing.
Check caption reading speed before publishing
Use reading-speed and line-length flags to find cues that need a human review.
Captions that only use words you said
An invented caption word can land on a card as if you said it.
Next task
Subtitle converter
Convert SRT or WebVTT captions into SRT, VTT or plain text on your device.
Subtitle editor
Edit individual caption text and timestamps, then export a subtitle file.
Subtitle timing shifter
Move every caption forwards or backwards by an exact offset.
Subtitle frame rate converter
Retiming captions from one frame rate to another keeps their relative spacing.
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