Subtitle Sync & Timing Tools
Subtitles showing up too early, too late, or slowly drifting away from the voices? Pick the tool that matches what you see. Everything runs in your browser, so your files never leave your device.
Tools in this category
Shift Subtitle Timing
Subtitles too early or too late? Move every line by any number of seconds.
Fixes:- subtitles out of sync
- subtitle delay
- move subtitles earlier
Open toolChange Subtitle Frame Rate
Convert timing between 23.976, 24, 25 and 29.97 fps when subtitles slowly drift.
Fixes:- subtitles drifting
- 23.976 to 25 fps
- PAL to film
Open toolSync Two Subtitles
Line one subtitle file up with another one that is already in sync.
Fixes:- sync subtitles to another file
- match two subtitle files
- second subtitle out of sync
Open tool
Which tool do I need?
- Every line is off by the same amount, e.g. always 2 seconds late.Shift Subtitle Timing
- It starts in sync, then drifts further off as the video plays.Change Frame Rate
- Only the second half is off, after a cut or an ad break.Shift Subtitle Timing, from line #
Why subtitles go out of sync
A constant delay usually comes from a different release of the video: a longer intro or an extra studio logo pushes every line back by the same amount. A delay that grows over time is almost always a frame rate mismatch, such as subtitles made for 25 fps played against a 23.976 fps video.
Recordings from TV and re-edited cuts mix both problems. The subtitles can be perfect until the first ad break, then late by a few seconds, then late by a different amount after the next one. Fix those one stretch at a time: shift the lines after the first break, apply, and move on to the next.
Check a line near the start and one near the end before you choose a tool. The same gap in both places means a shift will fix the whole file; a bigger gap near the end points to the frame rate.
Frequently asked questions
How do I know how far off my subtitles are?
Pause on a line of dialogue and compare when it’s spoken with when the text appears. Most players, including VLC, show the current time to the millisecond.
Can I fix timing without re-downloading the video?
Yes. The tools only change the subtitle file. Your video stays exactly as it is.
Do these tools work with .ass or .sub files?
Shift Subtitle Timing reads .srt, .vtt, .ass, .ssa, .sbv and MicroDVD .sub files, and can save the result in any of them; Change Frame Rate reads the same formats. Picture-based subtitles from DVDs and Blu-rays (.sub with .idx, .sup) can’t be edited as text.