Subtitle synchronizer: sync SRT timing online
Subtitles too early or too late? Shift every line by a few seconds or convert between frame rates, then download the fixed file.
Runs in your browser. Your file is never uploaded.
How to fix out-of-sync subtitles
Play the video and note how far off the first line is. If the subtitle appears 2 seconds before the speech, enter 2. If it appears 1.5 seconds late, enter -1.5. Every cue moves by the same amount.
If the subtitles start in sync but drift further apart over time, the file was made for a different frame rate. Choose the original and target frame rates, for example 23.976 to 25, and check the end of the video again.
Questions
What happens to lines that move before 0:00?
A line that would start before zero now starts at zero. A line that would end before zero is removed.
Which format do I get back?
VTT and ASS files stay in their format. Other formats are saved as SRT.
Can I sync only part of a file?
This tool shifts the whole file. For cue-by-cue timing, use the Aivently editor.
More free subtitle tools
Subtitle converter
SRT, VTT, ASS, SUB, SBV, TTML and more to SRT, VTT, ASS, TXT or JSON.
SRT to text
Strip numbers and timecodes and keep only the dialogue.
Subtitle checker
Find long lines, fast reading speed, overlaps and timing problems.
SRT merger
Join two subtitle files, one after the other or by time.
Dual subtitles
Two languages on screen at once, from two SRT files.
Sample SRT files
Valid SRT, VTT and ASS examples to copy or download.
Need this file in another language?
Aivently translates SRT, VTT and ASS files with AI, keeps every timecode, and lets you review each line before export. New accounts get 10 free minutes.