Change Video Playback Speed
Speed Up or Slow Down a Video, No Editor Needed
Need to use Change Video Playback Speed right now?
Useful for speeding through a long screen recording or creating a dramatic slow-motion effect.
Drop a video file, or click to browse
Processed locally in your browser — never uploaded
Speeds up or slows down both video and audio together, keeping them in sync — audio pitch stays natural since ffmpeg's tempo filter adjusts speed without altering pitch.
Features
- Runs entirely in your browser
- Privacy-first — your data is never uploaded
- Real-time, instant results
- 100% free, no sign-up required
- Works on desktop, tablet, and mobile
- No installation needed
Who uses this tool?
About Change Video Playback Speed
Speeding through a long screen recording, creating a dramatic slow-motion effect, or fitting a clip to a specific duration all require changing playback speed — and doing it well means video and audio have to stay perfectly in sync, not just the video track alone. This tool adjusts both together using a real FFmpeg build compiled to WebAssembly, running entirely inside your browser.
Video speed changes by adjusting each frame's timestamp (the setpts filter) — a factor above 1 compresses the timeline to play faster, below 1 stretches it to play slower. Audio speed uses FFmpeg's dedicated tempo filter rather than the same timestamp trick, since directly speeding up raw audio samples changes their pitch — the tempo filter instead resamples intelligently to change speed while keeping pitch natural, avoiding the chipmunk-voice or slow-motion-groan effect a naive approach would cause.
FFmpeg's tempo filter is only rated for factors between 0.5x and 2x per application, so for more extreme speed changes (very fast or very slow), this tool automatically chains multiple tempo adjustments together to reach the requested overall factor while staying within each individual filter's valid range.
The result is a single re-encoded video where both streams speed up or slow down together and stay in sync throughout — critical for anything where audio timing matters, like a tutorial or narrated clip, not just a silent time-lapse.
How it works
- Upload your video. The file loads into the browser-based FFmpeg engine.
- Set the speed multiplier. From 0.25x (quarter speed) to 4x (four times faster).
- Apply and download. Video and audio speed change together, staying in sync.
Examples
Speeding through a long recording
Input
20-minute screen recording, 2x speed
Output
a 10-minute video, audio pitch unchanged