Video Speed Changer
Preview slower or faster playback, then export an MP4 with matching audio tempo. Mute the audio when needed.
Free. No signup required.
Your video stays on your device.
Drop or paste a file here.
MP4 · WEBM · QUICKTIME · X-M4V
Add at least 1 file to continue.
MP4, WebM, MOV or M4V when your browser can decode them.
The video engine downloads only when exporting. Large exports can take several minutes.
What this tool does
Preview slower or faster playback, then export an MP4 with matching audio tempo. Mute the audio when needed.
How to use
Choose a video and open Speed. Preview a rate from 0.25× to 2×, optionally mute audio, then press Change speed to encode the clip with matching audio tempo.
Features
Preview slower or faster playback, then export an MP4 with matching audio tempo. Mute the audio when needed.
When to use it
Slow a short demonstration for review or speed up a routine recording.
Common questions
What should I know before using Video Speed Changer?
Changing speed re-encodes video and audio. Extreme slow motion repeats frames rather than generating new detail.
Data processing
This tool processes its input locally in your browser without sending it to a server for processing. Input and results are not included in share URLs.
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