Subtitle validator
Check SRT and WebVTT syntax, invalid times, overlaps, empty cues and reading speed.
Checks syntax, timing, empty cues, overlaps and reading speed. It does not check transcript accuracy. Conversion keeps caption text and times, but drops positioning settings and metadata blocks.
Catch export errors before publishing
The validator catches malformed timestamps, backward times and empty text. Overlaps and fast reading speed are warnings because some projects intentionally allow them. It does not compare captions with spoken audio or certify accessibility compliance.
Related tools
FAQ
Does this upload my recording? +
No. This tool processes the file on your device. There are no audio uploads or server processing charges.
Can I convert SRT and VTT here? +
Yes. After the file passes the error checks, download either format. Cue positioning settings and metadata are not preserved.