Tool 01 · Subtitle QA

Find subtitle timing mistakes before upload.

Paste SRT or WebVTT, or open a local file. Detect overlaps, invalid timecodes, out-of-order cues, reading-time warnings, and long lines. Shift timestamps and export corrected SRT or VTT.

Load subtitle text

🔒 Files are processed inside your browser. This tool does not send the text to a server. It supports basic SRT and WebVTT cues, not VTT STYLE/REGION styling blocks.

Open file (SRT or VTT · up to 2 MB)

Subtitle content

Correct and export

Shift every cue by milliseconds (negative = earlier)Invalid/overlapping cues must be fixed in the text above before export. Negative shifts that cross zero are rejected.

Exports renumber SRT cues. WebVTT cue positioning settings are not preserved. Always verify captions in your editing software.

Local validation

Paste a file to inspect.

Parsed cues0

Timing errors0

Warnings0

First cues

No valid cues yet.

Automated checks cannot verify whether words match the spoken audio. Technical PASS is not editorial or audio-sync approval.