Change Video Speed
100% private — runs on your device, never uploaded. Works offline once loaded.
Speeding up and slowing down are two different jobs with one control. Faster is how a long screen recording, a drive or a build becomes watchable — 1.5× or 2× removes dead time without you cutting anything. Slower is for detail: a golf swing, a reaction, a trick landing. The sound is re-timed along with the picture so speech still lines up, and you can keep voices at a natural pitch or let them rise and fall with the tape-speed effect. Nothing is uploaded.
Slow motion is decided when you film, not when you edit
Slowing a clip does not create frames, it holds each one on screen for longer. Halve the speed of 30 fps footage and you are watching 15 new images a second, which the eye reads as stutter. Film at 60, 120 or 240 fps and there are real frames to spread out — that is why phones offer a separate slow-motion mode rather than a slider afterwards.
As a rule of thumb: 60 fps footage takes half speed cleanly, 120 fps takes a quarter. Beyond that you need either a higher frame rate at the source or frame interpolation, which invents in-between images and brings its own artefacts.
Speeding up: where the time goes
For screen recordings, tutorials, drives and build videos, 1.5× to 2× is the sweet spot — the dead time disappears and speech stays intelligible. Beyond 2×, speech stops being useful and the clip becomes a time-lapse, which is a fine thing to want but a different one.
Sped-up footage also gets smaller: the same bitrate over a shorter running time means fewer megabytes, often by exactly the factor you sped it up.
Frequently asked questions
Why does my slow motion look choppy?
The source frame rate is too low. Slowing 30 fps footage shows each frame repeatedly; nothing can be done after filming except interpolate, which has artefacts of its own.
Can I speed up only part of a clip?
Trim the section first, change its speed, then join it back with the rest using Merge Video — or use the full Video Studio timeline, where speed is a property of each clip.
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