Is this video speed changer free and private?

Yes. It is completely free with no watermark or sign-up, and fully private — your video is processed right in your browser and never uploaded to any server. The first run downloads a ~30MB converter once, then everything happens on your device.

Does changing the speed keep the audio in sync?

Yes. The tool adjusts the video and audio together so the sound stays in sync at your chosen speed. Speeds are limited to the 0.5x–2x range to keep audio quality clean.

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Change Video Speed

Speed up or slow down a video.

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How to use the Change Video Speed

1Drop or select your video file (MP4, WebM, MOV, and more).
2Pick a playback speed from 0.5x slower up to 2x faster.
3Click Change Speed, then preview and download your speed.mp4.

About the Change Video Speed

Free in-browser video speed changer. Speed up or slow down any MP4, WebM, or MOV from 0.5x to 2x with synced audio. Private, fast, no upload, no watermark.

Part of our Audio & Video collection. Browse all tools.

Frequently asked questions

Is this video speed changer free and private?: Yes. It is completely free with no watermark or sign-up, and fully private — your video is processed right in your browser and never uploaded to any server. The first run downloads a ~30MB converter once, then everything happens on your device.
Does changing the speed keep the audio in sync?: Yes. The tool adjusts the video and audio together so the sound stays in sync at your chosen speed. Speeds are limited to the 0.5x–2x range to keep audio quality clean.