Video Speed Changer
Export a slower or faster video while keeping the audio pitch stable.
Local processing · No uploads · No sign-in
Processing and output
Choose a speed from 0.25x to 4x. Video timing and audio tempo are adjusted together.
Does my video get uploaded?
No. Selected video, audio, subtitles and fonts are processed in this browser. They are not submitted to a video processing server.
What settings does Video Speed Changer offer?
Choose a speed from 0.25x to 4x. Video timing and audio tempo are adjusted together.
Does changing video speed also change the audio?
Yes. Video timing and audio tempo change together while preserving audio pitch. At 2x speed, the clip is approximately half as long; at 0.5x, it is approximately twice as long.
Does slow motion create new intermediate frames?
No. This tool changes timing without AI frame interpolation. Slowing a low-frame-rate source can make motion less smooth.
Can I process large files on a phone?
Modern browsers are supported. Combined inputs are limited to 300 MB on desktop and 100 MB on phones or low-memory devices, with lower default output resolution. Merge up to 8 clips. Short clips work best; transitions, compression and conversion can take time.
Related video tasks
Cut a video by start and end time with precise trimming or a fast stream-copy mode.
Join multiple videos in order with fade, dissolve, slide or wipe transitions and audio crossfades.
Turn a short video segment into a looping GIF with adjustable width and frame rate.