Video tools
Speed up or slow down short MP4, WebM, MOV, or M4V clips into a downloadable WebM directly in your browser.
Your video preview will appear here.
Speed
Selected: 1.5x ยท estimated output 20.0s
Output quality
Speed-adjusted WebM output
This browser-only tool re-records the selected range as WebM at the chosen playback speed. It does not create a lossless MP4 speed edit.
Upload a browser-supported MP4, WebM, MOV, or M4V file, choose a speed such as 0.5x, 1.5x, or 2x, then create a downloadable WebM.
You can export the whole file or set a start and end time when you only need to speed up or slow down a short section.
This tool plays the selected range at your chosen playback rate, draws the frames into a canvas, and records the result as WebM with MediaRecorder.
It is a private browser workflow, not a lossless MP4 speed metadata edit. Output quality depends on width, bitrate, speed, and browser codec support.
Your video is decoded, speed-adjusted, and recorded locally in your browser. The source file is not uploaded or stored by this tool.
Slow motion takes longer to export because the browser records the slowed playback in real time.
This is useful for turning long screen recordings into faster demos, slowing down visual details, or creating short speed-ramped social clips.
No. Speed changes run locally with browser video, canvas, Web Audio, and MediaRecorder APIs. Your video is not uploaded or stored by this tool.
Browsers can record canvas video as WebM. MP4 speed changes usually require FFmpeg or another encoder outside standard browser APIs.
Audio is optional. When enabled, the browser attempts to route the video's audio into the recording at the selected playback speed, but support can vary.
The browser records playback in real time. A 20 second source range at 0.5x becomes about a 40 second output, so it takes longer to record.
Last updated: May 14, 2026
