Slow motion looks smoothest with videos shot at 60 fps or more.

Do my videos leave my device?

No. Videos are processed in your browser, on your device. There's no upload, so even large files start right away.

Is there a size limit?

No limits from us. Long or 4K videos need more memory and time; phones manage smaller files best.

Slow a video down for a slow-motion effect.

Drop a video to change its speedor paste with ⌘V. Your files stay on your device.

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Good to know: Slow motion looks smoothest with videos shot at 60 fps or more.
Do my videos leave my device?: No. Videos are processed in your browser, on your device. There's no upload, so even large files start right away.
Is there a size limit?: No limits from us. Long or 4K videos need more memory and time; phones manage smaller files best.

Ready-made settings for common jobs.