Upload a video, choose a playback speed from 0.25x to 4x, preview it, and download the result.
Speeding up or slowing down a video is common for time-lapses, slow-motion effects, or fitting a clip into a shorter format. This tool processes your video entirely in the browser using ffmpeg.wasm — no upload to a server, and no software install.
Step 1 — Upload your video.
Step 2 — Drag the speed slider from 0.25x (slow motion) to 4x (fast forward) and preview live in the player.
Step 3 — Click Process & Download to render and save the final video at that speed.
Processing very large or long videos. Since everything runs in your browser, very large files can be slow or run out of memory — trim to the section you need first.
Expecting audio pitch to stay natural at extreme speeds. Above 2x or below 0.5x, audio pitch correction is capped and may sound slightly off — video-only muted clips avoid this entirely.
The tool applies pitch correction (atempo) so voices don't sound like chipmunks or slow-motion growls at moderate speeds.
No, processing happens locally in your browser using ffmpeg.wasm — the video never leaves your device.