AVI → MP4
Convert AVI videos to MP4 – locally in your browser
Why AVI → MP4?
Convert AVI videos to MP4 – universally compatible, smaller files. Directly in browser.
Frequently Asked Questions
Why convert AVI to MP4?
MP4 is supported by all devices and browsers – much better compression than AVI.
Are my files safe?
Yes, conversion happens entirely in your browser.
About MP4
MP4 (MPEG-4 Part 14) was standardized in 2001 as ISO 14496-14 and is the most widely used container format for video and audio worldwide. Based on Apple QuickTime format (MOV), MP4 can hold various codecs, most commonly H.264/AVC or H.265/HEVC for video and AAC for audio. The format supports streaming via HTTP Live Streaming (HLS) and Dynamic Adaptive Streaming (DASH), subtitles, chapters, metadata, and multiple audio and video tracks. MP4 is the standard format for YouTube, Vimeo, Netflix, and social media platforms. The broad codec support and compatibility with virtually every device and browser make MP4 the safe choice for video distribution. MP4 files can also contain pure audio (M4A) or images. The ISO Base Media File Format standard on which MP4 is based is also the foundation for 3GP, HEIF, and other container formats.
About AVI
AVI (Audio Video Interleave) was introduced by Microsoft in 1992 as part of the Video for Windows framework and was the dominant video format on Windows systems for over a decade. AVI is based on the RIFF container and can hold various codecs, most commonly DivX or Xvid for video and MP3 for audio. The format does not support streaming or subtitles and has a 2 GB file size limitation in classic AVI, which can be overcome through OpenDML extensions. AVI is now considered obsolete since MP4 and MKV offer more features with better compression. Nevertheless, millions of AVI files from the 2000s still exist, and converting to MP4 or MKV is frequently necessary for modern playback. VLC and FFmpeg can read and convert AVI files with near-perfect reliability. AVI was the format that initiated the era of digital video on PCs and fueled the spread of movie rips on the internet.
Why convert AVI → MP4?
AVI (Audio Video Interleave) is a Microsoft video container format from 1992. It uses outdated codecs (MJPEG, DivX), produces very large files, and has no native support for streaming, subtitles, or modern H.264/H.265 codecs. Converting to MP4 (usually MP4) creates a modern, heavily compressed version with current codecs that plays on smart TVs, smartphones, tablets, and streaming platforms. MP4 future-proofs AVI videos. MP4 is the standard video format for web and mobile with H.264/H.265 video and AAC audio — universally compatible.