vs
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AVI vs MP4: which video format should you use?
A clear, practical comparison with a straight answer.
Use MP4 for anything current: it is smaller, plays on every device and browser, and streams properly. Keep AVI only for legacy files that already work, and convert them to MP4 the moment size or compatibility matters.
AVI is the video format of the 1990s Windows era; MP4 is the format of everything since. Both are containers that wrap a video and audio stream, but MP4's modern codecs make it far smaller and more compatible.
If you have an old AVI that plays fine, there is no rush. If you need it on a phone, a website, or simply smaller, MP4 is the answer.
.avi vs .mp4 at a glance
| .avi | .mp4 | |
|---|---|---|
| Age | 1992, legacy | 2001, current standard |
| Typical file size | Large | Much smaller at same quality |
| Common codecs | DivX, Xvid, older | H.264, H.265 |
| Phone and browser support | Poor, convert first | Universal |
| Streaming | No | Yes |
| Subtitles and chapters | Limited | Supported |
| Best for | Legacy files | Everything today |
Frequently asked questions
Is MP4 better quality than AVI?
At a given file size, yes. MP4's modern codecs pack more quality into fewer bytes, so an MP4 usually looks as good or better while being much smaller.
How do I convert AVI to MP4?
Use HandBrake: load the AVI, pick an MP4 preset and export. VLC can also convert. The result is smaller and far more compatible.