AVI vs WMV: Microsoft's Video Formats Compared
Published on March 27, 2026
AVI and WMV are both Microsoft video formats, but they work very differently. AVI (Audio Video Interleave) is a container format from 1992 that stores video with minimal compression, resulting in huge files with high quality. WMV (Windows Media Video) is a compressed format designed for streaming and smaller file sizes. Both formats are now considered legacy, with MP4 replacing both in most use cases.
File Size and Compression
AVI files can be enormous. A 10-minute clip captured in uncompressed AVI can be several gigabytes. AVI supports various codecs (DivX, Xvid, MJPEG), but even with compression, files remain large compared to modern formats. WMV uses Microsoft's VC-1 codec, which compresses much more aggressively. The same 10-minute clip might be 50-100 MB in WMV. This made WMV popular in the early 2000s when bandwidth and storage were limited.
Quality
Uncompressed AVI delivers the highest possible quality because no data is discarded. This made it the standard for video capture and editing in professional workflows. WMV sacrifices some quality for smaller files, but at medium to high bitrates, the quality is acceptable for playback. Neither format matches modern codecs like H.264 or H.265, which deliver better quality at smaller file sizes than both AVI and WMV.
Compatibility
AVI plays on most media players across Windows, Mac, and Linux because it has been around since 1992. VLC, Windows Media Player, and most video editors handle AVI without issues. WMV works natively on Windows but needs extra codecs or apps on Mac and Linux. WMV has poor web and mobile support, making it a bad choice for sharing online. Neither format works well for streaming compared to MP4 or WebM.
Modern Alternatives
Both AVI and WMV are outdated. MP4 with H.264 gives better compression than WMV with universal device support. MKV replaced AVI for storing high-quality video with multiple audio tracks and subtitles. For web delivery, MP4 and WebM are the only formats that matter. If you still have AVI or WMV files, converting to MP4 is the best move for compatibility and file size.
Which to Use
Neither. Convert both to MP4. If you must choose between the two, AVI is better for editing and archival since it preserves more quality. WMV is better if you need a smaller Windows-only file. But in practice, both formats should be converted to MP4 for long-term storage and sharing.
Convert your video files to a modern format with our Video to MP4 converter, or reduce file size with Compress Video. For more video format comparisons, see MOV vs AVI and FLV vs MP4.