Free tool · no install · works on your phone
Change video speed online — slow motion & timelapse, free
From 0.25× slow motion to 4× timelapse. The audio tempo follows the picture and the pitch is kept, so speech stays intelligible and music doesn't go chipmunk.
Preview free · download moves the result into your free Aperture library · 100 MB per file · first 60 s processed
How to change speed online
- Drop a video into the card.
- Set the speed factor between 0.25× and 4×.
- Press Change speed and preview the result.
Why change speed with Aperture
- 0.25× to 4× with pitch preservation
- Frame-accurate re-timing, audio stays in sync
- One input, instant result preview
- Free, no account needed, no watermark
FAQ
Does the audio pitch change?
No — the tempo filter preserves pitch, so voices and music sound natural at any factor.
What's the range?
0.25× (quarter speed) to 4× (four times faster), in 0.25 steps or any custom value.
Can I make a slow-motion clip from 60fps footage?
Yes — 0.5× or 0.25× works well; for the smoothest slow motion start from high-frame-rate source.
More free tools
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