Caption Cleanroom · E4 local prototype

Make SRT and VTT files upload-ready.

Validate timestamps and overlaps, reflow text toward two lines and 42 characters, convert formats, and download the result.

Private by design.
Files are read in this browser only. Nothing is uploaded, saved, tracked, or sent to an account.

1. Load a caption file

Choose an SRT or VTT file Or paste caption text

Output format

Reflow whitespace and long lines Clamp safe timestamp overlaps to the preceding cue end

Unsafe timing errors stay visible. Overlap clamping is opt-in and is skipped when it would create a zero-length cue.

No file analyzed yet