What does Change Video Speed do?
Speed up or slow down a video from 0.25× to 4×, adjusting the audio to match.
Change Video Speed accepts MP4, WEBM, MOV, MKV, AVI and M4V files, and produces MP4 output.
Your MP4, WEBM, MOV, MKV, AVI and M4V files are processed locally in your browser — they are never uploaded to our servers.
How to use Change Video Speed
- 1Drag and drop your file onto the upload area, or click “Choose file”.
- 2Adjust the change video speed settings to suit your needs.
- 3Click the main action button and wait a moment while it is processed on your device.
- 4Preview the result and download your MP4 file.
Supported formats
- Input
- MP4WEBMMOVMKVAVIM4V
- Output
- MP4
Frequently asked questions
Is Change Video Speed free?
Yes. Change Video Speed is completely free with no sign-up and no watermarks.
Are my files uploaded?
Your MP4, WEBM, MOV, MKV, AVI and M4V files are processed locally in your browser — they are never uploaded to our servers.
Is there a file size limit?
Free usage supports files up to 500 MB. Because processing happens on your device, very large files depend on your device's available memory.