Change Video Speed – Slow Motion & Speed Up Video Free

Make slow-motion replays or fast time-lapses from your own videos.

Free
Instant result
Private · on-device
No sign-up

How to use: Choose a video, pick a speed such as 0.5x for slow motion or 2x to speed up, choose what happens to the sound, then press Change speed and download.

Runs on your device. When you press the button, a free open-source video engine (FFmpeg, about 31 MB) downloads once and is then cached. Your video is never uploaded.

Choose a videoMP4, MOV, WebM, MKV · stays on your device

Speed

Sound

How to use the Video Speed Changer

Changing the speed of a video is an easy way to make it more fun or more useful: slow motion for a sports move or a pet’s jump, double speed for a long tutorial or a cooking clip, or 4x for a quick time-lapse of a sunset or a drawing.

Choose a video and pick a speed. Values below 1x slow it down: 0.5x makes every second last two. Values above 1x speed it up: 2x halves the length. Then choose the sound. Keep sound changes the speed of the audio while keeping its pitch natural, so voices do not turn into chipmunks or monsters. Remove sound is often better for big speed-ups and very slow motion, where speech is hard to follow anyway.

Press Change speed. The video is re-encoded to MP4 at the new speed on your device. Play the result and download it. The new length is shown in the progress line, and the original file on your device is never changed.

Common speeds and what they are good for

0.5x is the classic slow-motion replay for sports, dance moves and splashes. 0.75x gently slows a fast talker or a quick demonstration so people can follow it. 1.25x and 1.5x tighten up vlogs and walkthroughs without feeling rushed. 2x suits cooking, crafts and unboxing clips, and 3x to 4x turn long scenes such as a sunset, traffic or a drawing into a time-lapse.

The longer the output, the longer processing takes: slowing a 1-minute clip to 0.25x creates a 4-minute video, so trim to the important moment first.

Getting smooth slow motion

Slow motion looks smoothest when the original video was filmed at a high frame rate, like 60 or 120 frames per second, which many phones offer as a slow-mo or 60fps mode. A normal 30fps video slowed to 0.5x shows each frame twice as long, which looks fine; at 0.25x it starts to look steppy. This tool does not invent new frames, so what you see is honest to your recording.

Speeding up

At 2x, speech is still understandable for most people, which makes it handy for long how-to videos. At 3x and 4x, the result works as a time-lapse. Trim the part you want first with the Video Trimmer so you do not process footage you will not use, and turn a short sped-up clip into a looping GIF for fun.

VSH take

VSH take: speed changes are a small edit with a big effect, and keeping the voice pitch natural is what makes them look professional. Everything runs on your device for free with no watermark. Use these tools only on videos you made or have permission to edit.