Phone videos are often huge. Shrink them for sending or uploading; the compression number lets you balance size and quality yourself.
MP4, iPhone MOV, MKV, AVI, WEBM, 3GP and most other common formats.
Yes. It is completely free and needs no sign-up.
Files used with free tools are not kept on the server; they are deleted right after processing.
Yes. Kajino works on phones, tablets and computers in every browser, with nothing to install.