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AVI is a legacy format with inefficient compression — often 2-4x larger than equivalent MP4. Compressing AVI can reduce size by 60-85% while keeping the AVI container for legacy compatibility.
AVI is a legacy format from 1992 — its container and codecs are inefficient by modern standards. AVI files are often 2-4x larger than equivalent MP4 files. Compressing AVI reduces size dramatically while keeping the AVI container for systems that require it.
| Input format | AVI |
| Output format | AVI |
| Typical reduction | 60-85% |
| Encoder | libx264 or MPEG-4 |
| Audio | MP3 or AAC |
| Resolution | Preserved or downsampled |
| Max file size | 500 MB per file |
| File retention | Auto-deleted after compression |
The compressor decodes the AVI video and re-encodes it at a lower bitrate using H.264 or MPEG-4. Audio is preserved at MP3 or AAC. Output is a smaller AVI that retains legacy compatibility.
AVI files compress dramatically because the legacy container is inefficient. Even at Medium, most AVI videos look identical to the original on screens, and files are 60-70% smaller.
| Level | Size reduction | Best for |
|---|---|---|
| Light (1080p, 4 Mbps) | ~40-50% | Quality-preserving |
| Medium (720p, 2 Mbps) | ~60-70% | Legacy playback |
| High (720p, 1 Mbps) | ~75-85% | Severe limits |
| Maximum (480p, 0.5 Mbps) | ~85-90% | Max size reduction |
Last reviewed: 2026-10-01
