Speed up video without changing pitch
Enable Preserve original pitch to shorten tutorials, recordings or talking-head clips while keeping voices and music near their original tone. Audio remains aligned with the retimed video.
Speed up video without changing pitch online
Speed up a clip while keeping voices and music near their original tone, or slow video down for a detailed replay. Preview the new pace and synchronized audio before exporting locally.
Change video speed while keeping audio synchronized
MedleyKit retimes video and audio together in your browser. Choose a preset or enter a custom value from 0.1× to 16×, preserve the original pitch when needed and export without uploading the source file.
Slow down video or choose 0.1× to 16×
Create slow motion, make a timelapse or enter a custom speed. The estimated output duration updates before processing begins, and you can remove audio when a silent result works better.
Preview speed and pitch before export
The built-in player applies the selected speed and pitch behavior immediately, so you can judge the pacing and sound before the browser re-encodes the final MP4.
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.
Video speed and pitch questions
Answers about faster video, slow motion, synchronized sound and local processing.
How do I speed up a video without changing pitch?
Choose the video, select a faster value and leave Preserve original pitch enabled. MedleyKit retimes the audio to match the shorter video while keeping speech and music near their original tone. Preview the result before export because extreme speed changes can sound less natural.
Can I slow down a video without changing the audio pitch?
Yes. Select a speed below 1× and keep pitch preservation enabled. The browser stretches the audio to the longer duration and keeps it synchronized with the slow-motion picture. Longer outputs need more local processing time and storage.
Will the audio stay synchronized after changing speed?
Yes when Keep audio is enabled. MedleyKit retimes the complete media timeline so the audio duration follows the changed video duration. You can preserve the original pitch, let pitch change with speed for a tape-style effect or export without audio.
Is my video uploaded to change its speed?
No. Preview, pitch processing and MP4 export run in the browser on this device. The source file is not uploaded for processing, no account is required and MedleyKit does not add a watermark.