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.

Yes. Once the page and the video engine have loaded, it keeps working without an internet connection.

Make a video faster or slower, from 0.25× to 4×, with or without the sound.

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

MP4MOVWebMMKVAVI

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.
Does it work offline?: Yes. Once the page and the video engine have loaded, it keeps working without an internet connection.

Ready-made settings for common jobs.