Change Video Speed
Make a video play faster or slower. Speed up long recordings, create slow motion, or turn footage into a quick timelapse, with audio that keeps its natural pitch, changes pitch like a tape, or is removed.
- Files stay on your device
- No sign-up
- Free to use
Speed
Audio
Processing happens on your device with FFmpeg. Keep this tab open; long or high-resolution videos can take several minutes.
How to use Change Video Speed
- Drop a video onto the upload area.
- Choose a speed from 0.25× (four times slower) to 4× (four times faster). The new length is shown.
- Choose how to handle the audio.
- Select Change speed and download the MP4.
Change Video Speed features
0.25× to 4×
Eight speeds for slow motion, subtle changes and fast-forward.
Natural-sounding audio
Pitch-preserving time stretching keeps voices recognisable at any speed.
Tape-style option
Change pitch with speed for chipmunk or slowed-down effects.
Remove audio
Drop the sound for timelapses and slow-motion shots.
Length preview
See the resulting duration before processing.
On-device
Everything runs in your browser.
When to use Change Video Speed
- Speeding up tutorials and screen recordings so they are quicker to watch.
- Creating slow-motion clips of sports, pets or splashes.
- Turning a long drive, sunset or build into a timelapse.
- Slowing a dance or exercise video to learn the moves.
- Making a clip fit a time limit on social media.
Change Video Speed FAQ
Will slow motion look smooth?
Slowing a normal 30 fps video repeats frames, so very slow speeds can look choppy. Footage recorded at high frame rates, such as 120 or 240 fps slow-motion modes on phones, gives much smoother results.
How does the audio keep its pitch?
FFmpeg’s time-stretching filter changes the tempo of the audio without changing its frequencies, so voices stay at their normal pitch. Very large changes may sound slightly artificial.
What happens to the frame rate?
The output keeps a standard frame rate. Speeding up drops frames; slowing down repeats them.
Can I change the speed of only part of the video?
The whole video changes speed. Trim the part you want first with the Video Trimmer.
Which speed is best for tutorials?
1.25× or 1.5× usually remains easy to follow while saving a significant amount of viewing time.
Changing time in video and audio
Changing a video’s speed means changing its timestamps. Each frame carries a presentation time; dividing those times by the speed factor makes frames appear sooner or later. At 2× a ten-second clip lasts five seconds, and every other frame is dropped to keep a normal frame rate. At 0.5× it lasts twenty seconds, and frames are shown twice as long or repeated.
Audio is harder. Simply playing samples faster raises the pitch, as with a tape or record at the wrong speed, which can be fun but makes speech sound unnatural. Time stretching splits the sound into short overlapping pieces and spaces them differently, changing duration without changing pitch. FFmpeg’s atempo filter does this; for factors beyond 2× or below 0.5× several stages are chained.
Smooth slow motion depends on the source. Cameras and phones with high-frame-rate modes capture many more images per second, so slowing them down to normal playback rate shows real intermediate moments rather than repeated frames. Standard footage slowed a lot will show some stutter.
Speeding up is a quick way to make long content watchable. Timelapses at 4× or more condense slow processes like sunsets or construction, while modest speed-ups of 1.25× to 1.5× make lectures and tutorials more efficient without losing clarity.