MP4 vs WMV
MP4 and WMV represent the modern and legacy approaches to video on Windows. WMV (Windows Media Video) was Microsoft's proprietary video format, widely used in the Windows XP and Vista era for Windows Movie Maker output, streaming, and disc authoring. MP4 with H.264 has since become the universal standard, supported by every platform including Windows itself. WMV files do not play on Mac, iPhone, Android, or web browsers without additional software. There is no technical advantage to WMV over MP4 today -- MP4 produces smaller files with better quality and plays everywhere. WMV exists solely as a legacy format.
MP4 vs WMV — Feature Comparison
| Feature | MP4 | WMV |
|---|
| Compression Efficiency | H.264 (excellent) | WMV9/VC-1 (good) |
|---|
| File Size | Smaller | Larger at same quality |
|---|
| Windows Support | Native | Native |
|---|
| Mac Support | Native | Requires VLC |
|---|
| Mobile Support | Universal | Not supported |
|---|
| Browser Playback | All browsers | Not supported |
|---|
| YouTube Upload | Recommended | Accepted but converted |
|---|
| DRM | Optional | Built-in (Windows DRM) |
|---|
| Streaming | HLS, DASH (modern) | Windows Media Services |
|---|
| Active Development | Yes | Discontinued |
|---|
When to use MP4
Use MP4 for all video needs. It is the universal standard that plays on every device, browser, and platform. There is no modern scenario where you should create new WMV files instead of MP4.
When to use WMV
WMV is only relevant when you receive legacy files from Windows Movie Maker, older Windows applications, or archived content from the 2000s. In these cases, convert to MP4 for modern compatibility. There is no reason to create new WMV files.
Verdict: MP4 vs WMV
MP4 is superior in every way. If you have WMV files, convert them to MP4 for smaller files, better quality, and universal compatibility. WMV is a dead format with no active development.
MP4 vs WMV — Frequently Asked Questions
Why does Windows Movie Maker save as WMV?
Older versions of Windows Movie Maker (pre-2012) defaulted to WMV. The current Windows video editing tools save as MP4 by default.
Can Mac play WMV files?
Not natively. Install VLC (free) to play WMV files on Mac. For a permanent solution, convert WMV to MP4.
Is WMV still developed?
No. Microsoft has moved to MP4/H.264 as the standard video format in Windows. WMV (VC-1) is no longer being developed.
How much smaller will the MP4 be than WMV?
H.264 in MP4 is roughly 30-50% more efficient than WMV9/VC-1. A 1 GB WMV file may become 500-700 MB as MP4 at the same quality.
Convert between MP4 and WMV