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utils.sbs

Subtitles tool

Subtitle Shifter

Shift every caption cue forward or backward by milliseconds.

Runs on-deviceNo sign-upFree
All subtitles tools

Subtitle Shifter workspace

Workspace

Subtitle Shifter

Runs locally
sec

Supports SRT and WebVTT. Cue times are parsed to the millisecond and rebuilt without touching your video.

Captions

The guide

By the utils.sbs team · Reviewed November 2026 · How we build and review tools

Quick answer

Subtitle Shifter is a free browser-based subtitles tool. Shift every caption cue forward or backward by milliseconds. It runs with JavaScript text parsing locally, requires no account and does not upload your files. Open the page, add your input, adjust any options and download the result.

What is Subtitle Shifter?

Subtitle Shifter is a free browser-based subtitles tool from utils.sbs. Shift every caption cue forward or backward by milliseconds. It is built for quick, focused jobs: open the page, add your input, adjust the options and take the result with you. No account, install or server upload is required.

At a glance

CategorySubtitles
InputSRT, VTT or plain subtitle text
OutputAn adjusted SRT, VTT or plain-text subtitle file
EngineJavaScript text parsing
ProcessingIn your browser
PriceFree
AccountNot required

How Subtitle Shifter works

Subtitle files are parsed as text, adjusted with the selected timing or format options, and written back out as a downloadable file.

How to use Subtitle Shifter

  1. 1Open Subtitle Shifter and add your input.
  2. 2Adjust the options: shift by.
  3. 3Run the tool, check the preview or result, and download the output.

When to use Subtitle Shifter

  • Convert subtitle files between SRT, VTT and plain text.
  • Shift or retime captions after editing a video.
  • Clean duplicate cues and line breaks before uploading captions.

Inputs and options

Shift by
Use a negative value to shift earlier

Limitations

Overlapping cues or unusual text encodings may require manual cleanup after conversion.

Privacy and accuracy

Subtitle Shifter processes its input in the browser whenever the platform API allows it. Files and values are not uploaded to a server for processing, and the tool does not require an account. For calculations, use the result as a reference and verify important decisions against the source formula or a qualified professional. Read our methodology.

FAQ

Subtitle Shifter questions

  • What can I do with Subtitle Shifter?

    Shift every caption cue forward or backward by milliseconds. Subtitle Shifter is part of the Subtitles shelf on utils.sbs and is designed for quick, one-off tasks.

  • Is Subtitle Shifter free to use?

    Yes. Subtitle Shifter is free, requires no account, and has no per-file or per-use charge.

  • Are my files uploaded when I use Subtitle Shifter?

    No. Subtitle Shifter is designed to process your input locally in the browser. Files are not uploaded to a server for processing.

  • What formats does Subtitle Shifter support?

    It reads common subtitle formats such as SRT and VTT and writes the converted or adjusted file back out.

  • Can I use Subtitle Shifter on my phone?

    Yes. Subtitle Shifter is responsive and works in modern mobile browsers. Very large files may be limited by the device's available memory.

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