WALTR for Windows - The FASTEST Direct MP4, MKV, AVI Converter for Playing Video on iPhone & iPad [Online Code] Copy Any Format: Easily convert MKV, AVI, MP4 videos directly into to iPhone, iPad or iPod Touch without iTunes. Bullet Fast Speed: The most intuitive, fastest MP4, MKV, AVI video converter out there. Just drag & drop to copy music & video onto iPhone, iPad at avg. speed of 2GB/min. Play from Default iOS Video & Music Player: Forget worrying about 3rd party apps. You can access AVI, MKV, FLAC files directly from the default iOS Music or Videos player.