0.25× to 4×100% Free
Free Video Speed Changer
Slow motion, fast forward, timelapse — change video speed without distorting audio pitch.
1Upload your video
2Select speed
3Download video
⏩
Drop video here or click to upload
MP4, MOV, AVI, WebM, MKV supported
🔒 Processed locally — never uploaded to any server.
Frequently Asked Questions
What speed options are available?
0.25×, 0.5×, 0.75×, 1.25×, 1.5×, 2×, and 4×. Both the video and audio are adjusted to match.
Does the audio pitch change with speed?
No. The tool uses the atempo filter which adjusts audio speed while preserving pitch. Your audio won't sound chipmunk or distorted.
How do I make a slow motion video?
Upload your video and select 0.25× or 0.5×. The video will play at half or quarter speed.
How do I make a timelapse?
Select 2× or 4× to fast forward. 4× makes a 1-minute video play in 15 seconds.
Is my file uploaded anywhere?
No. Processing happens entirely in your browser using FFmpeg.wasm.