Subtitle Sync Fixer

How to use the Subtitle Sync Fixer

1. Open or paste your .srt or .vtt subtitle file.
2. Type how many seconds to shift: negative if the words come too late, positive if they come too early.
3. If subtitles start right but drift further off, open More options and use the two-point sync or the frame-rate fix instead.
4. Download the fixed file and load it in your player next to the video.

Examples

1
00:00:03,200 --> 00:00:05,900
Where were you last night?

2
00:00:06,400 --> 00:00:08,100
Out. Just... out.

3
00:00:09,000 --> 00:00:12,750
<i>That's not an answer,
and you know it.</i>

WEBVTT

intro
00:00:01.000 --> 00:00:03.500 line:85%
Welcome back to the workshop.

00:00:04.000 --> 00:00:07.250
Today we're building a bookshelf.

00:42:10.000 --> 00:42:13.000
Thanks for watching, see you next week.

1
00:00:10,010 --> 00:00:12,430
Ready when you are.

2
00:20:00,000 --> 00:20:02,500
We have twenty minutes left.

3
01:30:15,300 --> 01:30:18,000
And that's a wrap.

About this tool

Subtitles that are off by a couple of seconds ruin a film. This tool rewrites every timestamp in an SRT or WebVTT file so the lines appear when people actually speak. Most of the time a single shift fixes it: watch for the first clear line of dialogue, note how early or late the subtitle is, and enter that number, such as -2.5 for subtitles that show two and a half seconds too late.

If the first line is in sync but the later ones get progressively worse, the subtitles were made for a different cut or frame rate, and no single shift can fix them. Two-point sync solves this: tell the tool when the first and last lines should start, and it stretches or squeezes everything in between in a straight line. For the classic 23.976 versus 25 fps mismatch between film and PAL releases, the frame-rate fix applies the exact ratio for you.

The parser copes with real-world files: Windows line endings, a byte-order mark, commas or dots before the milliseconds and missing hours in WebVTT. Times are never allowed to go below zero, and lines pushed entirely before the start are dropped. You can also convert between SRT and VTT on the way out; WebVTT cue settings are kept, and speaker tags are turned into plain text for SRT.