Upload an MOV file and convert it to MP4. When the codecs already fit the target container, the conversion is lossless and near-instant; otherwise the video is re-encoded.
Your file never leaves your device. All processing happens right in your browser, and nothing is uploaded to a server.
MOV and MP4 are siblings from the same QuickTime lineage, and they speak the same codecs: H.264, HEVC, AAC. Conversion is therefore almost always a lossless stream copy into the MP4 container, done in seconds.
iPhones and many cameras record MOV, which Windows apps, Android phones, and web platforms handle inconsistently. MP4 with identical content sails through everywhere: email, editing software, course platforms, and players of every vintage.