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.