Change Video Speed≈
Speed up or slow down a video while keeping its audio synchronized and preserving pitch.
Your result.
How to use Change Video Speed
- Choose your MP4, WEBM, MKV, MOV, AVI, GIF, MPEG, MPG, M4V, OGV, TS.
- Upload a video and choose a speed from 0.25× to 4×. Up to 4K (3840×2160 or portrait), with a resolution-dependent duration: up to 10 minutes at 1080p or 150 seconds at 4K. File and output limits apply separately.
- Download a new MP4 with the selected playback speed.
Process multiple files
Use a workflow to apply the same settings to each file.
Formats and requirements
- Input formats
- MP4, WEBM, MKV, MOV, AVI, GIF, MPEG, MPG, M4V, OGV, TS
- Output
- MP4
- Availability
- Free in your browser and through the CLI
- Files per operation
- 1
- Browser file limit
- 128 MiB per file, 128 MiB total
What to expect
Processes locally with FFmpeg. Browser processing uses WebAssembly and downloads the engine on first use; large videos are better suited to the CLI. Re-encoding may lose quality. GIF output has no audio. Browser limits: Up to 4K (3840×2160 or portrait), with a resolution-dependent duration: up to 10 minutes at 1080p or 150 seconds at 4K. File and output limits apply separately.
Do my files leave my device?
No. Thanks to advanced file-processing technology, your files are processed directly on your device, inside your browser. OneKit does not receive your input files or results. Required public processing libraries may download when you first use the tool.
File privacy and local processing →