Speed up or slow down a video
Choose a speed between 0.25× and 4× to turn a long clip into a quick time-lapse or stretch a moment into slow motion. Everything is processed on your own device.
How it works
- 1
Choose or drop the video you want to change (MP4, MOV, WebM or MKV).
- 2
Pick a speed from 0.25× (four times slower) to 4× (four times faster), and decide whether to keep the sound.
- 3
Click Change Video Speed and download the new video. Nothing is uploaded.
From time-lapse to slow motion
Speeding a video up is the easiest way to make long footage watchable: a cooking session, a drawing, a build or a car ride becomes a snappy time-lapse-style clip at 2× or 4×. A 4× video lasts a quarter of the original length, so a 10-minute recording turns into 2 minutes and 30 seconds.
Slowing down does the opposite. At 0.5× or 0.25× a jump, a splash or a trick lasts two or four times longer, which gives it a slow-motion feel. Keep in mind that real slow motion is recorded at a high frame rate: a normal 30 fps video slowed to 0.25× shows each frame four times as long, so fast movement looks steppier than a clip filmed in your phone's slow-motion mode.
What happens to the sound
You have two options for the audio. Keep it, and it is sped up or slowed down by the same factor as the picture, so it stays in sync. Like a record played at the wrong speed, the pitch changes too: at 2× voices sound higher and chipmunk-like, at 0.5× they sound deeper. Vidmini does not correct the pitch.
Or remove it, which is often the cleanest choice for time-lapses and slow-motion clips. You can then add music in your editor or on the platform where you post the video. If you only want to remove the sound without changing the speed, use Remove Audio, which does not re-encode the video at all.
Frame rate and quality
Changing speed re-times every frame, so the video is re-encoded with your browser's WebCodecs encoder, using the hardware encoder of your device when available. When you speed up, the frame rate would rise with the speed: a 30 fps video at 4× would need 120 frames per second. Vidmini caps the output at 60 fps, which every phone, browser and platform plays smoothly, and drops the extra frames.
A re-encode always involves a small generation loss, usually invisible at normal viewing sizes. To keep the file light, trim the part you need first with Trim Video, then change its speed: fewer seconds to process, and a smaller result.
Private, free and without a watermark
The whole process runs in your browser with WebCodecs and WebAssembly. Your video is not uploaded, you do not need an account, and no logo is added. The page works offline once it has loaded. There is no size limit set by us: desktop browsers handle multi-gigabyte files, and phones are limited by their free memory and storage.
Frequently asked questions
How do I speed up a video?
Open the video, choose 1.5×, 2× or up to 4×, decide whether to keep the sound and click Change Video Speed. The result is a shorter video that plays faster in any player.
How do I slow down a video?
Pick a speed below 1×, down to 0.25× (four times slower). The video becomes longer and motion looks slower. For the smoothest slow motion, start from a clip recorded at a high frame rate.
Why does the sound change pitch?
The audio is played faster or slower by the same factor as the video, which shifts its pitch: higher when sped up, lower when slowed down. If you prefer silence, choose to remove the sound.
What frame rate will my video have?
Speeding up raises the frame rate, but the output is capped at 60 fps so it plays smoothly on every device. Frames beyond that are dropped.
Can I make a video loop after changing its speed?
Yes. After processing, use "Continue with this file" to send the result to Loop Video, which repeats it 2 to 10 times without another re-encode.
Is my video uploaded anywhere?
No. It is processed by your own browser and never sent to a server. The page only talks to vidmini.com for its own code, and no tracking cookies are used.