Free browser tool

Subtitle Time Shifter for SRT and VTT

Shift SRT or WebVTT subtitle timestamps forward or backward by seconds with browser-side processing.

FreeNo sign-upRuns in browser

Ready to use

Browser-side · no account · results stay on this page

Privacy note: This tool is marked browser-side in the tool registry. It works with generated values or pasted input rather than a required local file upload. No account is required for this public tool. Review data handling.

Subtitle time shifter

Shift every SRT or WebVTT timestamp forward or backward by seconds.

Offset seconds

Shifted subtitle output

4 timestamps updated.

1
00:00:02,500 --> 00:00:05,000
Welcome to the product demo.

2
00:00:05,500 --> 00:00:07,700
Everything runs in your browser.

Quick answer

Use this tool when subtitle timing is consistently early or late across the whole file.

It adjusts every timestamp while keeping cue text and layout lines intact.

Best inputs

One subtitle file

Paste a complete SRT or WebVTT file for best context.

Known offset

Measure how many seconds the first cue needs to move.

Backup copy

Keep the original subtitle text until you review the output.

Subtitle shift method

The tool finds timestamp tokens and adds the selected offset.

Comma and dot millisecond formats are supported.

Cue text and numbering are left in place.

Negative results are clamped to zero.

Example, Assumption, and Limitation

Use the result as a practical estimate or transformation, then confirm edge cases for critical work.

Example

Enter 1.5 to delay every cue by one and a half seconds.

Assumption

The subtitle drift is a fixed offset, not a gradually changing timing problem.

Limitation

It does not stretch subtitles, translate text, or fix individual cue timing.

Common use cases

Use these scenarios to decide which input, assumption, or follow-up tool fits this specific task.

Late captions

Delay captions after an intro edit.

Early captions

Move subtitles earlier after trimming video start.

Course videos

Adjust captions for edited lessons.

Publishing QA

Quickly test subtitle sync fixes before upload.

Frequently asked questions

Can this fix subtitles that are too early or too late?

Yes. Enter a positive offset to move subtitles later or a negative offset to move them earlier.

Does it support SRT and VTT?

Yes. It shifts timestamps that use comma or dot millisecond separators.

Will negative times be preserved?

No. Timestamps are clamped at 00:00:00.000 or 00:00:00,000.

How is the subtitle text processed?

The shift is handled in the browser for this tool based on the current public implementation. Avoid pasting sensitive subtitle text unless you have reviewed the implementation.