Move every subtitle cue forward or backward by one offset.
Shift SRT and VTT subtitle timings forward or backward locally.
The time shifter applies the same positive or negative offset to every parsed cue while preserving the cue text and subtitle format.
00:00:01,000 → +1.500 s
00:00:02,500
One uniform offset is applied to cue start and end times.
00:00:03.000 → -0.800 s
00:00:02.200
This tool does not stretch timing or correct drift that grows during the video.
Hello world
Hello world
One uniform offset is applied to cue start and end times.
Processing happens locally in this browser. Your text or file is not uploaded to LumaTool servers.
Fix a constant audio/subtitle delay.
Align captions after trimming a video intro.
Create an offset version for another edit.
00:00:01,000 → +1.500 s 00:00:03.000 → -0.800 s Hello world
One uniform offset is applied to cue start and end times. This tool does not stretch timing or correct drift that grows during the video.
Processing happens locally in this browser. Your text or file is not uploaded to LumaTool servers.
Choose only the options needed to turn SRT or WebVTT and an offset into the shifted subtitle file; the defaults preserve the least surprising behavior.
Review validation messages and compare a representative sample before using the result in production.
Yes. The workspace and result controls adapt to desktop and mobile browsers.
Using a negative sign in the wrong direction. Trying to fix gradual drift with a constant offset.
Processing happens locally in this browser. Your text or file is not uploaded to LumaTool servers.
Convert WebVTT captions to SRT subtitle format locally.
Use Now SConvert SRT subtitle files to WebVTT locally in your browser.
Use Now SClean subtitle text, remove tags, normalize whitespace, and keep cue timing.
Use Now SRepair SRT numbering, blank lines, timestamps, and cue order locally in your browser.
Use Now SCount subtitle blocks, words, characters, duration, reading speed, and longest lines.
Use Now