Convert Any Video Format Online
KaijuConverter converts between all major video formats including MP4, MKV, MOV, AVI, WebM, WMV, FLV, MPEG, and more. Works on any device — no software installation required.
Most Popular Video Conversions
MKV to MP4: Convert Matroska videos to MP4 for universal device compatibility — iPhones, Android, smart TVs, and social media.
MOV to MP4: Convert iPhone and Mac QuickTime videos to MP4 for Windows and Android playback.
MP4 to MOV: Convert MP4 to QuickTime MOV for Apple Final Cut Pro and iMovie editing workflows.
AVI to MP4: Modernize legacy AVI files for current devices and platforms.
No Quality Loss
When the source video is already in H.264 or H.265 format, our converter remuxes to the new container without re-encoding — zero quality loss, ultra-fast conversion. For format changes that require re-encoding, we use high-quality settings to minimize quality impact.
Video Formats Supported
Input: MP4, MKV, MOV, AVI, WebM, WMV, FLV, MPEG, 3GP, TS, MTS, and more. Output: MP4, MKV, MOV, AVI, WebM, GIF, MP3 (audio extraction), and more.