# Speed up video, or slow it down

From 0.25× slow motion to an 8× time-lapse, with the sound kept natural or muted. MP4, MOV, WebM and more. Free, no sign-up.

Your file never leaves your device: the tool runs inside your browser. Up to 500 MB and 2 minutes. Use it at https://opusmotion.com/tools/video-speed-changer.

## How to use it

1. Pick the speed: below 1× slows it down, above 1× speeds it up.
2. Keep the sound (its pitch stays natural) or mute it.
3. Drop your video, or tap the box to pick it. It's re-encoded at the new speed on your device.
4. Download the MP4, or put the clip in a launch template.

The first time, your browser downloads the video engine (31 MB, once); after that it opens from the cache.

## Questions

### How do I speed up a video?

Pick 1.25×, 1.5×, 2×, 4× or 8×, then drop your video. A 60-second clip at 2× comes out 30 seconds long, at the same frame rate.

### Does the sound go high-pitched?

No. The sound is stretched or squeezed in time while its pitch stays the same, so voices still sound like themselves. At 4× and 8× speech gets hard to follow, so you may prefer to mute it.

### Will slow motion look smooth?

The frame rate stays the same, so slowing down shows each frame for longer: it doesn't invent frames in between. A clip shot at a high frame rate (60 fps or more) stays smoother when you slow it down.

### How do I make a time-lapse?

Use 8×: a minute becomes 7.5 seconds. For more, run the result through again (8× twice is 64×).

### How long can the video be?

Up to 2 minutes and 500 MB. On a phone or low-memory device: 1 minute and 200 MB. It's re-encoded on your device, so a long or 4K clip takes a while, and longer on a phone.

### Is my video uploaded anywhere?

No. The speed change runs inside your browser and the file is never sent to a server. The first time, your browser downloads the video engine (31 MB, once); after that it opens from the cache.

## More free tools

- [Reverse video](https://opusmotion.com/tools/reverse-video.md): Play a clip backwards, sound included, or make it a boomerang
- [Video converter](https://opusmotion.com/tools/video-converter.md): Any video to MP4: MOV, WebM, MKV, AVI and more, copied without re-encoding when it can be
- [GIF compressor](https://opusmotion.com/tools/gif-compressor.md): Shrink a GIF under the size you need, like Product Hunt's 3 MB
- [All free tools](https://opusmotion.com/tools.md)