MP4 vs AVI

Rarely for new content. AVI is primarily encountered when dealing with older video archives, legacy Windows software, or content created in the early 2000s. Modern video creation workflows universally favor MP4 or MKV.

It can, depending on the codec. If you re-encode during conversion, there will be some generation loss. To minimize quality loss, use a high-quality setting or copy the video stream without re-encoding if the codec is already H.264.

Many AVI files use minimally compressed codecs like DivX, Xvid, or uncompressed video, resulting in much larger files than H.264 MP4 at equivalent quality. Even when using the same codec, AVI containers are less efficient than MP4.

No — web browsers do not natively support AVI. Unlike MP4, AVI files cannot be played in HTML5 video players or on platforms like YouTube without first converting to a web-compatible format.

MP4 (with H.264 codec) effectively replaced AVI as the dominant video format for most uses. MKV replaced AVI for high-quality media storage with multiple audio tracks and subtitles. Both offer far better compression and features.