subtitlefixer

Shift subtitles

No file yet

Add a subtitle file to start.

Shift subtitles moves SRT, VTT, and ASS timings by a given number of milliseconds in your browser.

How to

  1. Add an SRT, VTT, or ASS file.
  2. Enter the offset in milliseconds. Use a negative number to move cues earlier.
  3. Download the file with the updated timings.

Before and after

Before

1
00:00:12,400 --> 00:00:15,120
We should have left an hour ago.

2
00:01:02,040 --> 00:01:05,800
The train does not wait.

After

1
00:00:13,900 --> 00:00:16,620
We should have left an hour ago.

2
00:01:03,540 --> 00:01:07,300
The train does not wait.

What it does and does not do

What it does

  • Moves the start and end of every cue by the same number of milliseconds
  • Keeps the subtitle text unchanged
  • Works on SRT, VTT, and ASS in the browser

What it doesn't

  • Does not fix drift that increases over the length of the video
  • Does not translate or rewrite dialogue
  • Does not upload the file

FAQ

How do I shift subtitles that show up too early or too late?

Add an SRT, VTT, or ASS file and enter an offset in milliseconds. A positive number moves every cue later. A negative number moves every cue earlier.

How many milliseconds are in one second?

One second is 1000 milliseconds. If the dialogue starts two seconds after the subtitle, enter 2000. If the subtitle is half a second late, enter -500.

Which subtitle formats can I shift?

SRT, VTT, and ASS, including SSA. The same offset is applied to each cue's start and end.

Does shifting change the words?

No. Only the timestamps move. The text of each cue stays as it is.

Can one offset fix subtitles that drift further out of sync?

No. One offset moves every cue by the same amount. That corrects a constant delay, not a drift that grows toward the end of the video.

Do my subtitle files get uploaded?

No. The shift runs in your browser, and the file stays on your device.

Related tools