Speed a video up for a timelapse or slow it down for slow-motion, then export. Everything runs in your browser; nothing is uploaded.
Exporting plays the video through at the new speed, so a timelapse renders faster than the clip and slow-motion takes longer. Keep this tab active while it exports.
The Video Speed Changer speeds up or slows down a video and exports a new file at the new speed — right in your browser, with no upload, no watermark, and no software to install.
Drop in a clip and choose a speed: below 1× turns it into smooth slow-motion, above 1× compresses it into a fast-forward timelapse. The tool plays your video back at the chosen rate, redraws each frame onto a canvas, and re-encodes it locally — so your footage never touches a server. People use it to:
You can keep the audio pitch natural when changing speed, or let it shift for a classic chipmunk or deep-voice effect. One honest trade-off of doing everything in the browser: exporting plays the clip through at the new speed, so slow-motion takes longer than the original while a timelapse is quicker. In return, your video stays completely private and there's nothing to install.
No. Changing the speed happens entirely in your browser using the canvas and MediaRecorder APIs, so the file never leaves your device.
Pick a speed below 1× (like 0.5× or 0.25×) for slow motion, or above 1× (like 2× or 4×) for a fast-forward timelapse. The estimated new length is shown before you export.
Yes. Audio is sped up or slowed down along with the video. Turn on Keep audio pitch to avoid the chipmunk or deep-voice effect, or turn it off to let the pitch shift naturally.
Slowing a video down stretches the frames it already has, so very slow speeds can look slightly stuttery — browsers cannot invent new in-between frames. Speeding up is always smooth.
Exporting runs while the video plays at the new speed, so a timelapse renders faster than the original and slow motion takes longer. A 30-second clip at 2× renders in about 15 seconds.