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Video Speed Controller & Changer

Speed up or slow down MP4, WebM, MOV, and AVI videos directly in your browser using FFmpeg WebAssembly. Fast, private, with pitch preservation.

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How to use this tool

  1. Upload or drag and drop your video file (MP4, WebM, MOV, AVI, or MKV) into the workspace.

  2. Select a speed preset (e.g., 0.5x Slow-Mo, 1.5x Fast, 2.0x Double Speed, or 4.0x Time-Lapse) or use the custom slider.

  3. Preview the playback speed directly in the interactive HTML5 video player.

  4. Choose whether to preserve audio pitch with the atempo filter or mute audio completely.

  5. Click 'Apply Speed Change' to re-time and encode the video 100% locally in your browser.

  6. Inspect the final speed-adjusted video and download it to your device.

Frequently asked questions

Quick answers about file privacy, processing modes, formats, and device support.

The tool uses FFmpeg's setpts filter inside WebAssembly to mathematically re-calculate presentation timestamps (PTS) and re-encodes the stream with high-efficiency H.264 ultrafast rendering to ensure smooth motion.
No. When 'Preserve Audio' is selected, our engine applies FFmpeg's compound atempo filter, which dynamically alters tempo while maintaining natural voice and instrument pitch.
No. All speed processing and encoding occur 100% client-side inside your browser using an isolated WebAssembly sandbox. Nothing is ever sent to any remote server.
Yes. Set the speed multiplier to 2.0x, 3.0x, or 4.0x and toggle 'Mute Audio' to transform standard footage into cinematic time-lapses.
You can adjust the speed of MP4, WebM, MOV, AVI, and MKV video files. The output is exported with FastStart web streaming optimization.

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