How does speed affect duration?

At 2x, a clip lasts approximately half as long. At 0.5x, it lasts approximately twice as long. The source on your device stays unchanged.

Does slow motion create extra detail?

No. Changing speed changes frame timing; it does not generate new detail between the original frames. Existing audio is adjusted to follow the new timing.

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Video Speed

Change Video Speed Online

Make a video faster or slower online with practical speed presets and audio kept in sync.

How to change video playback speed

Upload the video you want to speed up or slow down.
Choose a preset: 0.25x, 0.5x, 0.75x, 1.25x, 1.5x, 2x, 3x or 4x.
Confirm permission and start processing.
Download the MP4 and check the timing of its picture and audio.

Supported inputs

Uploaded MP4, MOV, WebM, AVI, MKV, MPEG and M4V files
Files within the configured upload limit

Available outputs

Processed MP4 video
Temporary signed download link

Why use this tool

Dedicated Change Video Speed workflow
No account required
Background video queue processing
Temporary files removed automatically

Common problems

The file is rejected: Choose a supported video format within the upload limit.
Processing fails: The source may be damaged or use a codec unavailable to the server FFmpeg installation.

Frequently asked questions

How does speed affect duration?: At 2x, a clip lasts approximately half as long. At 0.5x, it lasts approximately twice as long. The source on your device stays unchanged.
Does slow motion create extra detail?: No. Changing speed changes frame timing; it does not generate new detail between the original frames. Existing audio is adjusted to follow the new timing.

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