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.

Select or drag and drop your media file into the Change Video Speed tool above. Your file is processed directly inside your browser using WebAssembly.
Configure your desired settings, conversion presets, or editing controls for the selected media.
Process your file locally and preview the result in the interactive player or canvas viewer.
Click Download to save the finished file directly to your device with no watermarks, accounts, or file size limits.

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.