Change video speed
Speed a clip up for a timelapse or slow it down to see detail.
- Runs on your device — the file is never sent anywhere
- No sign-up, no watermarks, no daily quotas
- Free, with no limit on how often you use it
How it works
Speeding video up turns a long screen recording into something watchable and a static shot into a timelapse. Slowing it down lets you see what actually happened in a fast moment. Both are simple changes that most online tools want an account for.
Audio keeps its pitch
The soundtrack is time-stretched rather than replayed faster, so voices stay natural instead of rising in pitch. Clips with no audio track are handled too.
Slow motion has a limit
Slowing footage down does not create detail that was never filmed. A clip shot at 30 frames per second played at quarter speed still only has 30 frames for every original second, so it will look stuttery. Genuine slow motion has to be filmed at a high frame rate in the first place — no software can add it afterwards.
Speeding up drops frames
At 4× and beyond, frames are discarded rather than blended. That is what makes timelapse look like timelapse, and it is also why fast motion can look choppy on detailed footage.
Length changes accordingly
A ten-minute clip at 2× becomes five minutes; at 8× it becomes seventy-five seconds.
Change video speed — questions
Will slowing it down give me smooth slow motion?
No. Slow motion has to be filmed at a high frame rate. Slowing ordinary footage stretches the frames it already has, which looks stuttery.
Does the audio change pitch?
No. It is time-stretched, so voices stay natural.
What if my clip has no sound?
It is handled — the tool falls back to processing the picture alone.
Is my video uploaded?
No. Everything runs in your browser.