Free online tool
Subtitle Time Offset
Shift every subtitle forward or backward by milliseconds.
Shift every subtitle cue earlier or later
Add or subtract the same number of milliseconds from all SRT or VTT timestamps to correct synchronization.
- Supports positive and negative offsets
- Preserves comma or dot timestamp style
- Prevents adjusted timestamps from becoming negative
Important limitation: A single offset fixes a constant delay only. Progressive drift requires time scaling, which this tool does not perform.
How do I make subtitles appear earlier?
Enter a negative value, such as -1500 for 1.5 seconds earlier.
What happens before zero?
Any adjusted negative timestamp is safely clamped to 00:00:00.000.
How to use this tool
- 1Choose or drop your file.
- 2Adjust the available options.
- 3Process and download the result.
Private browser processing
Your file is processed on this device and is not uploaded to our server.
Frequently asked questions
Is my file uploaded?
No. File processing happens locally in your browser.
Does it work on phones?
Yes. It works in modern mobile and desktop browsers.