Format comparison
WMA vs M4A
How do WMA and M4Acompare? Here's everything you need to know to choose the right format — and how to convert between them.
.wma
Full guide →Windows Media Audio
WMA is Microsoft's proprietary audio format. While it offered competitive quality in the early 2000s, it has largely been superseded by AAC and other formats. It's still encountered in legacy Windows media libraries.
.m4a
Full guide →MPEG-4 Audio
M4A is an audio-only MPEG-4 container, typically containing AAC or ALAC encoded audio. It's Apple's preferred format for music files in iTunes and Apple Music.
| Specification | WMA | M4A |
|---|---|---|
| Full name | Windows Media Audio | MPEG-4 Audio |
| Extension | .wma | .m4a |
| MIME type | audio/x-ms-wma | audio/mp4 |
| Category | Audio | Audio |
| Developer | Microsoft | Apple / ISO |
| Year introduced | 1999 | 2001 |
| Compression | Lossy | Lossy |
WMA advantages
- Good compression at low bitrates
- DRM support for content protection
- Native Windows support
- Lossless mode available
WMA limitations
- Limited cross-platform support
- Proprietary format
- Declining popularity
- Not supported on many portable devices
M4A advantages
- Better quality than MP3 at same size
- Native Apple ecosystem support
- Supports both lossy (AAC) and lossless (ALAC)
- Rich metadata and artwork
M4A limitations
- Less universal than MP3
- Confusing relationship with AAC
- Some older devices don't support it
- Apple-centric ecosystem
Which should you use?
Both are excellent audio formats. WMA is preferred for legacy windows media libraries, while M4A shines at itunes music library.
Best uses for WMA
Legacy Windows media libraries
Windows-based audio systems
DRM-protected content
Older portable devices
Best uses for M4A
iTunes music library
Apple Music downloads
Podcast distribution
Audiobook files
Convert between WMA and M4A
Need to switch formats? Convert for free with SquishConvert.