How to Fix Out-of-Sync Subtitles (Delay, Drift and Frame Rate)

Step 1: Diagnose the problem

Play the video and compare three moments: the beginning, the middle and the end. Write down how far off the subtitles are at each point (negative if early, positive if late).

Fix 1: A constant offset

Find a line of dialogue early in the film. Note when it is spoken and when its subtitle appears. The difference is your offset. If the subtitle appears later than the speech, advance the file by that amount; if it appears earlier, delay it. A tool like our SRT timing shifter accepts seconds or milliseconds and keeps all formatting.

If you only want to watch and don’t need a corrected file, many players can do it live: in VLC press H to make subtitles appear earlier and G to make them appear later (about 50 ms per press). Save the corrected file when you want a permanent fix.

Fix 2: Drift because of frame rate

Films are normally 23.976 or 24 frames per second; PAL television runs at 25. When a film is sped up from 24 to 25 fps, it plays about 4% faster and every time stamp has to be multiplied by 24/25 = 0.96. A 90-minute (1:30:00) subtitle made for 23.976 fps video must become 1:26:18.8 for a 25 fps version — nearly 4 minutes difference at the end. The mismatch grows steadily, which is the typical signature of drift.

• 23.976 → 25 fps: multiply by 0.95904
• 25 → 23.976 fps: multiply by 1.04271
• 24 → 25 fps: multiply by 0.96
• 25 → 24 fps: multiply by 1.04167

Use the FPS converter and enter the two frame rates. If you are not sure of the frame rates, use the two-point sync: tell it the correct times of the first and last line, and it calculates the stretch for you.

Fix 3: Jumps in the middle

If the offset changes suddenly, the video you have probably differs from the subtitle’s source: an extended cut, a removed intro, advertising breaks or a movie split into two files. Find the position where the change occurs, split the subtitle there, shift each part by its own amount and, if needed, join the pieces again.

Fix 4: Find a better subtitle

Subtitles are timed for a specific release. If the video file name contains tags such as BluRay, WEB-DL or HDTV, look for a subtitle with the same tag. It will often match perfectly and save the effort of correcting.

Check your result

After fixing, jump to at least three points in the video — the start, the middle and just before the end — and make sure the subtitles match the speech. The SRT checker will also tell you whether the new file is valid.

Common scenarios and the quickest fix

• The subtitles are exactly 2 seconds late everywhere: shift by −2 seconds.
• You are playing a TV recording and the subtitle came from a Blu-ray: the recording has adverts and a different intro; split the file at the break and shift each section.
• The subtitle is right for the first hour, then runs ahead: the video probably runs at a different frame rate; use two-point sync with the first and last line.
• Only the first few minutes are wrong: some releases cut a studio logo; shift the whole file by the length of the logo.

If none of this works, the subtitle was probably made for a different cut of the film. Searching for a subtitle that matches the release tag of your video is often faster than correcting a poor one.

Frequently asked questions