About this tool
When subtitles run ahead of or behind the audio by a constant amount, the fix is to shift every cue by the same offset. Enter the number of seconds, positive to delay the subtitles or negative to bring them forward, and the tool rewrites all the timestamps while keeping the file in its original format.
How to use it
- Drop your SRT, VTT, ASS or SSA files into the box above, or click to browse. Nothing is uploaded.
- Adjust the options if you want; the defaults suit most files.
- Click the button and wait a moment.
- Download the results individually or all at once as a ZIP.
Questions
The subtitles drift more and more over time. Does this fix that?
No. Drift means the frame rate of the subtitles and the video differ; that needs a stretch, not a shift. A constant offset is what this tool corrects.
Is the styling kept?
Formatting tags are removed so the text is clean; timing and line breaks are preserved exactly.
What is the difference between SRT and VTT?
SRT is the older, simplest format that media players expect. WebVTT is the web standard for the HTML video element and platforms like YouTube; the timing syntax differs slightly.
Is it free, are files uploaded, which browsers work: the general questions are answered once for the whole site.