How to Convert AVI to MP4 (Modernize Old Videos)

Why Convert AVI to MP4?

AVI is a legacy video format from Microsoft (1992). AVI files are common in old home video archives and files from legacy camcorders. MP4 is the modern standard — supported by every device, editing tool, and streaming platform.

How to Convert AVI to MP4

1. Go to the AVI to MP4 converter.
2. Upload your .avi file.
3. Click Convert — FFmpeg re-encodes to H.264/AAC MP4.
4. Download the MP4 file.

Quality and File Size

If the AVI contains H.264 video, the converter uses stream copy — no quality loss. If it contains DivX/Xvid, re-encoding to H.264 produces a similar or smaller file size with the same or better quality, as H.264 is more efficient than older codecs.