Sync subtitles that drift out of time
Two-point sync fixes subtitles that get further out of step as the video plays — the classic sign of a frame-rate or speed mismatch — and any offset at the same time.
Move subtitles by a fixed amount when every line is off by the same delay.
Seconds (2.5), milliseconds (1500ms) or a time (00:00:02,500). Subtitles appear too early → Later.
For subtitles that drift. Pick two cues far apart and enter when each should appear.
Rescale times when the subtitle was made for a video with a different frame rate.
The file open now is part 1 / language 1.
Cues
Save options
Output preview
How to sync subtitles that drift out of time
- Open subtitles (and the video). Open the subtitle file. Loading the video is optional but makes it easy to read exact times.
- Set point 1. Choose an early line and type, or capture from the video, the time it is actually spoken.
- Set point 2. Choose a late line and enter when it is spoken. The preview shows the speed and offset.
- Apply and save. Click Apply sync, spot-check a few lines in the middle and download.
About this tool
If the first lines are nearly right but the last ones are many seconds off, the subtitle file runs at a slightly different speed from your video. Shifting cannot fix that, because the error grows over time. Two-point sync measures it from two known moments and corrects both the speed and the offset in one step.
Pick one line near the beginning and one near the end — the further apart, the more accurate — and type the time each should appear in your video. Every other cue is moved proportionally: new time = b1 + (old time − a1) × (b2 − b1) ÷ (a2 − a1). Load the video into the preview and press “Use video time” while paused on each line to capture the times exactly.
The tool shows the speed factor it will apply. If it matches a known frame-rate ratio — ×0.95904 is 23.976 → 25 fps — it tells you, and you can use the FPS tab for the same result on other files from that release.
FAQ
What is the difference between shift and sync?
Shift moves every line by the same amount. Sync also changes the speed, so it fixes subtitles whose error grows from the start of the video to the end.
Which lines should I use as sync points?
Use two clearly spoken lines as far apart as possible, such as the first line of dialogue and one in the last ten minutes. Avoid lines that start during music or long pauses.
The middle is still off after syncing — why?
The video and subtitles probably come from different cuts (an added scene or removed recap). Sync each part separately using “From the selected cue onward” in the Shift tab.