Convert legacy AVI videos to modern MP4 format for playback on phones, tablets, web players and social platforms. Processing runs locally in your browser.
拖放文件到此处，或
MP4 · MOV · WebM · MKV · AVI
AVI is a decades-old container that many modern devices and platforms cannot play. Convert to MP4 (H.264) for universal compatibility and often smaller file sizes.
AVI files often use inefficient codecs. Converting to MP4 with modern encoding typically reduces file size significantly while maintaining visual quality.
Your AVI file is converted entirely on your device. Family archives and personal recordings never leave your browser.
Convert old camcorder and VHS capture files from AVI to MP4 for modern playback and sharing.
Digitized archivesMake AVI files playable on iPhone and Android without installing extra codecs.
Phone playbackPrepare AVI clips for embedding on websites and uploading to video platforms.
Web publishing关于此工具、支持流程和本地浏览器处理的常见问题回答。
Yes. LessMB converts AVI to MP4 for free in your browser without requiring an account.
Usually yes. AVI often uses older, less efficient codecs. Modern H.264 encoding in MP4 typically produces much smaller files at similar quality.
No. The conversion runs locally in your browser. Your video stays on your device.