Subtitles too early
If captions consistently appear before the spoken dialogue, use a positive shift to delay the entire subtitle track.
SUBTITLE TIMING
Fix subtitle timing online without rewriting the dialogue.
When subtitles are consistently early or late, a global shift usually solves the problem. When the error grows throughout the video, you need drift correction instead. SRT Subtitle Fixer supports both workflows directly in the browser.
TIMING TOOLS
Open subtitle fixer →Shift or correct drift.
Load your SRT or VTT, adjust timing, then run the full QC report again.
Subtitles too late
If captions consistently lag behind the dialogue, use a negative shift to move the track earlier.
Progressive drift
If the first cues are close but the final cues are far off, a constant offset is not enough. Progressive scaling can retime the file between an anchor and target end time.
Milliseconds matter
SRT and VTT timing can be adjusted with millisecond precision. Small offsets can be useful when syncing speech after an edit or re-export.
Text stays untouched
The timing tools modify cue times rather than rewriting subtitle dialogue. After retiming, the main validator checks the result again.
Common causes
Different video cuts, added intros, removed sections, re-encodes and frame-rate differences can all create subtitle synchronization problems.
HOW TO DIAGNOSE SYNC
Delay or drift?
Every subtitle is off by about the same amount
That points to a constant offset. Compare one recognizable spoken line to its cue and use the difference as the global shift.
The first part is close, but the end is badly out of sync
That points to progressive drift. Check an early cue and a late cue; if the offset grows over time, use drift correction rather than repeatedly applying fixed shifts.
What happens if a backward shift would create a negative timestamp?
The timing workflow clamps transformed timestamps at zero so the resulting file cannot contain negative cue times.
AFTER RETIMING
Open SRT validator →Run QC again.
Timing changes can create overlaps or very short gaps, so always validate the resulting subtitle file before delivery.