Does audio stay in sync?

Yes — both video and audio are re-timed by the same factor.

Change Video Speed

Speed up or slow down a video.

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Adjust playback speed from slow motion to fast forward. Audio is re-timed to match. Runs in your browser.

Open the Change Video Speed tool and add your file — it's processed in your browser, never uploaded.
Adjust the available options to get the result you want.
Download the result. There's no sign-up, no watermark, and no size cap.

Does audio stay in sync?: Yes — both video and audio are re-timed by the same factor.

Other private, in-browser tools you might need.

Cut a clip out of a video — fast and lossless.

Join multiple video clips into one.

Trim the edges off a video frame.

Remove the audio track from a video.