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Sidecar subtitles

A sidecar subtitle file is a separate timed text asset associated with a video, such as an SRT or VTT file.

Updated 2026-10-29 · Topicut editorial

Meaning

A sidecar subtitle file is a separate timed text asset associated with a video, such as an SRT or VTT file.

A practical example

A delivery package may include video.mp4 and captions.en.vtt so a receiving player can offer a selectable English track.

What to check

Matching filenames do not guarantee matching versions. Test the player association and retain which video revision the sidecar was checked against.

For a related planning or text task, open the srt vtt converter. The tool has its own limits; its result is not a measurement or approval of every concept described here.

Continue with the video glossary or a workflow guide.

Continue: Subtitle editing

  • SRT ↔ VTT converter
  • Subtitle time shifter
  • Fix a constant subtitle delay, then check readability
  • SRT vs VTT: convert plain subtitles and check the result
  • SRT subtitles
  • WebVTT
  • Subtitle synchronization
  • Shift subtitles and convert SRT to VTT

Working on a specific brief? Request a sample to discuss scope and availability. Self-serve video generation remains closed.

Sources

  1. W3C: WebVTT

RELATED TERMS

SRT subtitles

WebVTT

Subtitle synchronization

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