Video & Audio
Change Video Speed
Speed a clip up or slow it down, with the audio pitch kept natural.
A timelapse effect, a slow-motion replay, or just trimming a long screen recording down to a watchable speed — changing playback speed is one adjustment, but doing it as an export (rather than just a player setting) means the sped-up or slowed-down version is the file itself, ready to share anywhere.
The browser's own audio pipeline keeps pitch natural by default — the same technology that lets you watch a video at 1.5x without voices going high and squeaky — and that setting can be turned off if you specifically want the classic chipmunk-or-drawl effect.
How to use it
- Choose a video file.
- Set the speed with the slider — anywhere from a quarter speed to four times normal.
- Leave Keep pitch natural ticked for a normal-sounding voice at the new speed, or untick it for the old-fashioned pitch-shifted effect.
- Press Apply and export. The clip plays once at the new speed while it is re-recorded, so exporting at 2x takes half as long as the original, and slowing to 0.5x takes twice as long.
- Preview it, then press Download.
Questions
Why does slowing a video down take longer to export than speeding it up?
Because the export works by actually playing the clip at the new speed and recording that in real time — there is no bundled video encoder to process frames faster than playback. A slowed-down clip simply plays for longer.
Will the audio still sound right at a very extreme speed?
Pitch correction works well within a moderate range — roughly 0.5x to 2x. Right at the extremes (0.25x or 4x) audio can sound processed even with pitch correction on, which is a limitation of the correction algorithm itself rather than this tool.
What file do I get back?
A WebM video (VP9 or VP8 with Opus audio) at the new speed, ready to play or share.