MP4 vs AVI
MP4 and AVI are both video containers, but they are generations apart. MP4 is the modern standard with efficient compression and universal support. AVI is an older Microsoft format that produces much larger files and lacks modern streaming features.
Use MP4 for almost everything today — it is smaller, streams well, and plays everywhere. Use AVI only when working with legacy systems or software that specifically requires it.
MP4 vs AVI: side-by-side comparison
| Attribute | MP4 | AVI |
|---|---|---|
| Era | Modern (2001+) | Legacy (1992) |
| Compression efficiency | High (H.264/H.265) | Lower; bigger files |
| File size | Smaller | Much larger |
| Streaming support | Excellent | Poor |
| Compatibility | Universal | Declining |
| Best for | Everything modern | Legacy/archival workflows |
What is MP4 and what is AVI?
MP4
MP4 pairs a flexible container with efficient modern codecs like H.264 and H.265, delivering small files that stream smoothly and play on every device. It is the default choice for virtually all video today.
AVI
AVI (Audio Video Interleave), introduced by Microsoft in 1992, is a robust but dated container. It supports many codecs but lacks efficient compression and modern streaming features, so files are large and less suited to web use.
When to use which
Choose MP4
Choose MP4 for any new video you create, share, stream, or store — it is smaller and universally compatible.
Choose AVI
Choose AVI only when a legacy device, editor, or workflow explicitly requires it; otherwise convert AVI to MP4 to save space.
Convert between these formats
Use our free, browser-based converters: