Convert AVI to MP4 Online for Free
AVI to MP4 Converter – Free Online, No Quality Loss
AVI is an older video format that many modern devices and platforms no longer support well. This tool converts your AVI files to MP4 — the universal video standard — without losing quality. Upload, convert, and download. No software to install, works in your browser.
How it works
Upload the AVI
Choose the older video file you want to modernize.
Convert to MP4
The video and audio are converted into an MP4 container.
Download and preview
Check playback, audio sync, and file size.
Frequently asked questions
About AVI to MP4
AVI to MP4 converts older video files into a format that works better on modern devices and websites. AVI files often come from old cameras, screen recorders, CCTV systems, or legacy editing software, and they may use codecs that phones or browsers do not support. MP4 is usually the safer sharing format. It can reduce file size and improve playback compatibility, especially when encoded with H.264 video and AAC audio. Very old AVI files may still have quality limits from the original recording. After conversion, check audio sync and playback because legacy AVI files sometimes have unusual frame rates.
Updated June 2026: Added compatibility guidance for converting older AVI files to MP4 for modern devices, browsers, editors, and uploads.
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