Shift subtitle timing
Subtitles a second early or late? Move every cue in an SRT or WebVTT file by the same amount, or only the cues after a certain point. It runs in your browser: the file never leaves your computer.
Paste subtitles or open a file to start.
How to fix subtitles that are out of sync
- Paste the subtitles or open the .srt / .vtt file.
- Enter the shift in seconds:
1.5moves every cue 1.5 seconds later,-0.8moves them earlier. You can also write00:00:02,500. - If only part of the video is off, for example after a scene was trimmed, set Only cues from to the time where it starts going wrong.
- Download the shifted file. It keeps your file name with “-shifted” added.
Only the timing lines change. The text, numbering and styling of your cues stay exactly as they were. For line length, reading speed and caption style, see how to add captions to a video.
Questions
Is my subtitle file uploaded anywhere?
No. The shift runs in your browser on this page. The file is read on your computer and the shifted copy is created there too.
Which formats work?
SRT (00:01:02,345) and WebVTT (00:01:02.345 or 01:02.345). Each timestamp keeps its own format, so the file stays valid for whatever played it before.
How do I know how much to shift?
Play the video, note when a line is spoken and when its subtitle appears, and shift by the difference. If the subtitle comes too early, shift by a positive number; too late, a negative one.
The subtitles drift: fine at the start, off by the end. Will this fix it?
A shift moves every cue by the same amount, so it fixes a constant offset, not drift. Drift usually means the subtitles were made for a different frame rate or a different cut of the video. Shifting from a later point fixes a section where a cut was added or removed.
What happens to times that would go below zero?
They start at 0:00 and the tool tells you how many there were, so nothing gets a negative time that a player would reject.
Cutting the video too?
Endroll is an AI video editor for Windows and Mac. Write what the video should say, and it finds the moments in your own footage and builds the cut, captions included. See how it works.