A final check before delivery.
CaptionCheck is a free browser tool for video editors, subtitle translators and creators who already have an SRT or WebVTT file and want to review it before delivery.
What it helps with
Inspect timing overlaps, short gaps, reading speed, line lengths and malformed timestamps. Preview safe cleanup, compare multilingual timelines, convert SRT and VTT, and download reviewed files or a quality report.
Your files stay on your device
Subtitle processing and local video preview happen in the browser. There is no account or upload step. Optional usage analytics exclude subtitle text and filenames. Read the privacy details.
Built for a careful final pass
This tool does not transcribe audio, judge translation accuracy or certify delivery compliance. Findings need human review. For full authoring, use a dedicated subtitle editor alongside CaptionCheck.
Help shape the tool
CaptionCheck is an independent product experiment, operated under the CaptionCheck name. The current tool is free to use. Send feedback or report a problem, ideally with a small invented example. Start with the worked examples.