About Video Caption Tools & Subtitle Time Shifter
Fix out-of-sync video subtitles. Advance or delay all subtitle timestamps by positive or negative milliseconds or seconds to perfectly align audio and captions across video editors and streaming players.
Key Capabilities & Features
- Shift all subtitle cues forward (+) or backward (-) by precision seconds or milliseconds
- Supports both .srt and .vtt file formats
- Prevents negative timecodes with automatic 00:00:00 clamping
- Interactive time offset slider and numeric input
- Download synced subtitle file directly
How to Use Video Caption Tools & Subtitle Time Shifter
Paste Subtitles
Upload or paste your unsynced subtitle file.
Set Time Offset
Enter the seconds to delay (e.g. +1.5) or advance (e.g. -2.0).
Download Synced File
Export the adjusted subtitle file and test with your video.
Privacy & In-Browser Execution Guarantee
100% Client-Side. Time shifting calculations occur on your computer.
Frequently Asked Questions
How do I know how much time to shift my subtitles?
Play the video in VLC and check the audio delay hotkey (G/H in VLC) to determine the exact millisecond offset needed, then enter that number here.
What video caption formats can be formatted and shifted?
The tool supports both SubRip (.srt) and WebVTT (.vtt) captions, allowing time offset synchronization, character line wrapping, and syntax validation.
Can I fix out-of-sync audio and captions with this tool?
Yes. If your subtitles appear too early or too late compared to the video audio, enter the timing difference in seconds or milliseconds to shift all caption cues forward or backward in unison.