Fix subtitles that appear too early or too late
Choose the right shift direction, keep a copy, and check what happens to captions near the start.
If every subtitle appears the same amount too early or too late, you can shift the whole file. First check the start, middle and end of the video. If the gap keeps growing, a single shift will not fix it.
Keep the original subtitle file. The examples below use made-up cues so you can see exactly what changes in the subtitle converter.
Pick the right direction
Suppose a line appears at 4 seconds, but the speaker says it at 5.5 seconds. The subtitle is early, so it needs to move 1.5 seconds later. Use a positive shift.
If the speaker talks first and the subtitle follows 1.5 seconds afterward, move it 1.5 seconds earlier with a negative shift.
| Original cue | After a +1.5-second shift |
|---|---|
| 4–6 seconds | 5.5–7.5 seconds |
| 9–11 seconds | 10.5–12.5 seconds |
| 15–17 seconds | 16.5–18.5 seconds |
Both the start and end move by the same amount, so the duration of each cue stays the same unless it crosses zero.
Shift and download a sample
- Download the original SRT and drop it into the converter, or paste its contents into Paste your subtitles.
- Under Save as, choose SRT to keep the format or VTT for a web caption track.
- Move Time shift toward Later, or open Enter an exact shift and set Time shift (seconds) to 1.5.
- Select Convert subtitles, inspect the result, then download it.
- Load the new file with the matching video in your player or editor. Check a clear spoken line near the beginning, middle and end.
The first cue should now look like this in SRT:
1
00:00:05,500 --> 00:00:07,500
Pick a colour.
Compare your export with our shifted SRT or shifted VTT. The converter edits the caption file; it does not listen to the video or find the offset for you.
Watch what happens near zero
Moving captions earlier can put them before the start of the video. Our converter clamps negative times to zero and omits a cue if no positive duration remains.
For example, a cue from 0.5 to 1.2 seconds disappears after a −1.5-second shift. A cue from 1 to 2 seconds becomes 0 to 0.5 seconds: it is kept, but shortened.
Try the near-zero sample and compare it with the earlier-shifted result. Three cues become two. If everything would be removed, the converter reports an error rather than exporting an empty caption file.
A time shift cannot repair every mismatch
A fixed gap is different from drift. If the start is aligned but later captions are increasingly wrong, check that the subtitles belong to the same edit of the video. A missing intro, an extra cut or a playback-speed difference may need individual cue edits or a timing-scale adjustment elsewhere.
Format conversion also has limits. WebVTT can include cue placement, styles and other information. This converter keeps cue text and adjusts the outer start/end times; it omits layout settings, style blocks and comments. It does not retime karaoke timestamps embedded inside cue text. Use the original subtitle editor for those tracks.
What we checked
On 5 October 2026, we ran these files through the converter's actual function. The +1.5-second SRT and VTT exports kept all three cues, including a two-line caption and the name Zoë. We also checked the negative-shift clipping case and a plain SRT → VTT → SRT round trip. The test results include the outputs and file hashes.
These are file checks, not a playback test against a real video. You still need to check the export with your own footage.