Video Speed Changer
Adjust playback speed for video (slow-motion or fast-forward)
Loading video processing library...
Upload Video
Select a video file to adjust speed
Supports MP4, WebM, AVI, MOV, and other video formats
0.25x (Slow)1.0x (Normal)3.0x (Fast)
Processed Video
Preview and download your speed-adjusted video
Upload and process a video to see results
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About Video Speed Changer
Adjust Video Playback Speed
This tool allows you to change the playback speed of your videos, creating slow-motion or fast-forward effects. Powered by FFmpeg WebAssembly, all processing happens in your browser - your videos never leave your device.
Features
- Adjust speed from 0.25x to 3.0x
- Create slow-motion effects (0.25x - 0.75x)
- Fast-forward videos (1.25x - 3.0x)
- Preview original and processed videos
- Quick speed presets for common speeds
- High-quality video processing with FFmpeg
- Audio pitch adjustment to match video speed
- 100% client-side processing (private & secure)
- Download processed videos instantly
Speed Options
- 0.25x: Very slow motion (1/4 speed)
- 0.5x: Slow motion (half speed)
- 0.75x: Slightly slow
- 1.0x: Normal speed (original)
- 1.25x: Slightly faster
- 1.5x: Fast (1.5x speed)
- 2.0x: Very fast (double speed)
- 3.0x: Ultra fast (triple speed)
Use Cases
- Create slow-motion effects for sports or action videos
- Speed up long tutorials or lectures
- Make time-lapse videos from regular footage
- Adjust video speed for social media content
- Create dramatic slow-motion scenes
- Speed up gameplay or screen recordings
- Adjust video length to fit time constraints
How It Works
- Upload your video file (any format)
- Select desired speed using slider or presets
- Click "Change Speed" to process the video
- Preview the processed video with new speed
- Download the speed-adjusted video
Technical Details
- Uses FFmpeg WebAssembly for video processing
- Maintains video quality during conversion
- Automatically adjusts audio pitch to match speed
- Supports all common video formats (MP4, WebM, AVI, MOV)
- Processing time depends on video length and device speed
- Output format: MP4 with H.264 video and AAC audio
Privacy & Security
All video processing happens entirely in your browser using FFmpeg WebAssembly. Your video files are never uploaded to any server, ensuring complete privacy and security for your media.
Tips
- Smaller videos process faster
- Use 0.5x for smooth slow-motion effects
- Use 2.0x for quick time-lapse style videos
- Preview the video before downloading
- Processing may take a few minutes for large files