Subtitle Sync
Use our free subtitle synchronizer to sync subtitles online, resync subtitles, and correct timing. Adjust offset by seconds or milliseconds to match your video—no signup.
Precise Timing
Subtitle correction with millisecond precision. Resync subtitles and fix sync issues.
Instant Results
See changes in real-time. No complex setup, just upload, adjust, and download.
All Formats
Works with SRT, VTT, ASS, SSA, SBV, SUB, LRC, and JSON subtitle formats.
Upload Subtitle File
Drag and drop your subtitle file here, or click to browse. We'll help you fix the timing synchronization.
Frequently Asked Questions
How does subtitle synchronization work?
Simply upload your subtitle file, enter the time offset (positive to delay, negative to advance), and download the synchronized file. All subtitle timestamps will be adjusted by the same amount.
What time formats are supported?
You can enter time adjustments in seconds (e.g., 2.5) or in the format MM:SS.mmm (e.g., 00:02.500). Both positive and negative values are supported.
Can I preview the changes before downloading?
Yes! The tool shows you a preview of the first few subtitle lines with the new timing before you download the complete synchronized file.
What is a subtitle synchronizer?
A subtitle synchronizer (or sub sync tool) adjusts timing so subtitles match the video. Ours works with SRT, VTT, ASS, SSA, SBV, SUB, LRC, and JSON. Use it to resync subtitles or correct offset.
Will this work with all subtitle formats?
Yes. Our subtitle sync online tool works with all supported formats including SRT, VTT, ASS, SSA, SBV, SUB, LRC, and JSON.