How to use Subtitle Editor and Sync Shifter
- Choose the source and output subtitle syntax, then load the cues into the editor.
- Change individual cue text or times as needed; enter the global shift in seconds.
- Run the export and inspect its cue timings and discard report before using the download.
Example: Subtitle Editor and Sync Shifter
Move captions half a second later.
Options
- Global shift (seconds)
- Seconds are added to every exported start and end. Positive delays the subtitles; negative advances them. The default 1.5 is a starting value, not a measured correction.
Supported inputs and limits
Where your input is processed
This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.
Delay and advance have opposite signs
A positive global shift adds time to both cue boundaries. A negative shift moves cues earlier. If any resulting start would be negative, the tool refuses the job rather than dropping that cue or silently placing it at zero. Use small shifts and compare a known spoken moment in your player.
A global offset cannot repair growing drift
One offset moves every cue equally. If captions line up near the start but drift later, the source may have a different time basis. This editor does not discover that relationship automatically. Check the media and edit the affected timings; format conversion and loss permission do not solve synchronisation.
Questions about Subtitle Editor and Sync Shifter
Does a shift remove cues before zero?
No. A shift producing invalid negative timing is refused.
Are overlapping subtitles always an error?
No. Overlaps can be intentional; inspect them in your player.
Does the page find the right offset from a video?
No. You enter the offset after comparing your subtitles with the media.