Make an MP4 file smaller and keep it an MP4, so it still plays everywhere. The video is re-encoded in your browser and never uploaded.
An MP4 is a container. What makes it large is the video stream inside, so compressing an MP4 means re-encoding that stream at a lower bitrate. The container, the file extension and the compatibility stay the same: the output is an MP4 with H.264 video and AAC audio.
Smaller file scales the long side to about 854 pixels, Balanced to about 1280, and Best quality keeps the original size. If a level would make the file larger, the original is returned unchanged. For a target such as 10 MB, use Compress to 10 MB, and for other formats see the main video compressor.
Slightly. Re-encoding discards some detail, but at the Balanced level the loss is usually hard to see on a phone or laptop screen.
Yes. The soundtrack is kept, at a lower bitrate to save space.
Your device sets the limit. VimCut warns from about 500 MB, or lower on a phone with little memory, and blocks files above 2 GB.
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