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Video Speed Changer

Speed up or slow down video from 0.1x to 10x (presets 0.25x–4x) with pitch-corrected audio via chained atempo filters. Make a 20-minute lecture watchable at 2x — local FFmpeg work, unlimited saves.

Runs on FFmpeg

100% Local Browser Native

How to Use the Video Speed Changer

1. Upload the video

Lectures, sports, or tutorials.

2. Set the speed

Slider 0.1x–10x or presets 0.25x–4x; audio pitch-corrects via atempo chaining.

3. Download retimed

Save the file (downloads are unlimited).

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Frequently Asked Questions

What speeds work best?

1.5–2x for lectures (comprehension holds), 0.25–0.5x for sports analysis and tutorials. The slider spans 0.1x–10x with presets at 0.25, 0.5, 0.75, 1, 1.25, 1.5, 2, and 4x; output duration is simply original ÷ speed, shown live before export.

Does audio stay in sync?

Yes — video retimes via setpts=PTS/speed while audio chains atempo filters (single atempo within 0.5–2x, chained 2.0/0.5 stages beyond). Past 2.5x, consider muting and adding captions instead.

Do retimed clips upload?

No — speed changes run locally in your browser with FFmpeg. Only saves touch the network — downloads are unlimited.

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Last updated October 2026