Convert SRT Subtitles for WebVTT

SRT commonly stores numbered subtitle blocks with start and end times. WebVTT uses a different file structure and can include cue identifiers, positioning, and other settings. A conversion should preserve the spoken text and timing while representing the cues in syntax the receiving player accepts.

SRT numbering is not the same thing as a stable cue identifier. Review the beginning, middle, and end of the VTT, and look for malformed timestamps or text that has shifted into the wrong cue. A file that parses can still show captions too early, too late, or for too short a time.

Compare the time format at the first cue and around a few scene changes. Rounding a timestamp or shifting a millisecond separator can change when text appears. Overlapping cues may be intentional for some content, but they should be reviewed rather than automatically treated as an error.

Watch for cues that run beyond the media duration, appear on a blank interval, or leave a long gap in speech. Editing a timestamp is different from converting syntax; if the source timing is wrong, correct it against the video in a subtitle editor and retain the original timing reference.

Subtitle timing is tied to a particular cut. If the video was trimmed, re-encoded with a changed opening, or edited between revisions, a previously correct SRT may drift against the new version. Include a version marker in filenames or project notes when several cuts are in circulation.

For publication, verify that the video player can load the VTT and that viewers can turn captions on and off. Keep the source subtitle file for later edits. Conversion does not proofread the transcript, certify caption accuracy, or establish compliance with an accessibility policy.