Video Audio Sync Tool - Fix Audio Delay Online
Fix out-of-sync audio in videos. Adjust audio delay from -5 to +5 seconds with precise control. Preview before processing. Browser-based.
Upload Video
Drop video here or click to browse
MP4, WebM, MOV, AVI, MKV supported
File:
Size:
Size:
Audio Delay Adjustment
-5.0s (advance) 0.0s +5.0s (delay)
Tip: Move the slider to adjust audio timing.
Preview
Preview shows original video. Download to get synced version.
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How to Use
- Upload your video file
- Adjust the audio delay slider
- Positive values delay audio (push later)
- Negative values advance audio (push earlier)
- Use quick presets for common adjustments
- Click "Process Video" to apply changes
- Download the synced video
Common Sync Issues
- Audio ahead of video
- Use positive delay (+0.3s to +1.0s typically)
- Audio behind video
- Use negative delay (-0.3s to -1.0s typically)
- Slight drift
- Try ±0.1s to ±0.3s adjustments
- Major offset
- May need ±1s to ±3s correction
Features
- Precise 0.1s adjustment increments
- Range: -5s to +5s offset
- Video quality preserved
- Quick preset buttons
- Real-time delay calculation
- MP4 output for compatibility
- No server upload required
Privacy
All processing happens in your browser using FFmpeg WebAssembly. Your videos never leave your device—completely private and secure.
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