Change Video Speed (Fast Forward / Slow Motion)

Speed up or slow down a video and save it. Runs FFmpeg inside your browser. Outputs MP4.

Your video is never uploaded. Everything is processed inside your browser.

Drag & drop a video or click to choose (MP4 / WebM / MOV…)

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About this tool

This free tool changes a video's playback speed and saves it as a new file. Speed it up to watch faster, or slow it down to study movement. The audio is pitch-adjusted so it stays natural. Your video is never uploaded; everything runs in your browser.

FAQ

Q. Does the audio speed up too?

A. Yes — it's adjusted to match the video and kept natural-sounding (videos without audio are sped up video-only).

Q. It says a server is required.

A. The engine can't run from file://. Please use it on the live website (https://).

Q. What's the output format?

A. MP4, which plays on most devices and apps.