Subtitle Smart Sync
Perfectly sync your subtitles by matching a single line of dialogue to the right moment in your video.
Click or drag your .srt or .vtt file here.
Click or drag your video file here.
Powerful & Intuitive Subtitle Syncing
Instant Visual Feedback
See your timing adjustments reflected instantly in the video preview. No more guesswork.
Single-Point Syncing
Our smart algorithm calculates the precise offset based on a single correct anchor point, syncing the entire file at once.
Granular Control
Easily make micro-adjustments down to the millisecond to achieve flawless, professional-grade synchronization.
Complete Privacy
Both your video and subtitle files are processed directly in your browser. Nothing is ever uploaded to a server.
How to Sync Your Subtitles
Get perfect timing in three easy steps.
1. Upload Your Files
Select or drag-and-drop both your subtitle file (.srt or .vtt) and your video file. The tool loads them locally.
2. Find Your Anchor
Play the video to find a clear line of dialogue. Then, select the matching subtitle text from the list to create a sync point.
3. Fine-Tune and Download
Preview the new sync. If needed, make tiny adjustments, and then download your perfectly timed subtitle file.
Common Questions
Everything you need to know about subtitle shifting.
How does the 'one-point sync' method work?
The tool identifies the time difference (offset) between where the dialogue occurs in the video and where it's timestamped in your file. It then applies this exact same offset to every single subtitle cue, shifting the entire file forward or backward in time.
Will the synced subtitle file work in any video player?
Yes. The tool outputs a standard SRT or VTT file with corrected timestamps. This file will work correctly in any media player, on any platform (like YouTube or Vimeo), or in any editing software that supports these formats.
What's the difference between SRT and VTT?
SRT (SubRip) is a basic subtitle format with timestamps and text. VTT (WebVTT) is a more modern format for the web that supports everything SRT does, plus options for styling, positioning, and metadata.
Is my file uploaded to a server?
No. Just like our other tools, all processing happens directly in your browser using JavaScript. Your video and subtitle files remain private on your computer and are never sent over the network.