Speed up or slow down from 0.1× to 16×
Shorten tutorials and recordings, create slow motion or enter a custom speed. The estimated output duration updates before processing begins.
Change video speed online — free and private
Speed up a clip, create slow motion or turn a long recording into a timelapse. Preview the pace instantly, then export MP4 on your device.
A private online video speed changer
MedleyKit changes video and audio timing locally with browser media codecs. Choose a preset or enter a custom value from 0.1× to 16× without uploading the source file.
Preview the selected speed instantly
The built-in player changes playback rate as soon as you choose a preset or custom speed, so you can judge the pacing before export.
Keep audio synchronized and preserve pitch
Retime the complete media timeline while keeping audio aligned with the new duration and near its original pitch, or remove sound for a silent result.
Local processing
Your source video and generated results are processed on this device instead of being uploaded to a remote media-processing server.
Focused tools
Each editing step has its own dedicated page, keeping the controls, choices and interactions simple.
Continuous workflow
Pass a local result directly to another compatible tool and combine multiple editing steps in the same browser on this device.