About WMA Files
Windows Media Audio
WMA is a proprietary Microsoft audio format from the Windows Media framework. Once common in the Windows ecosystem, it has been largely replaced by AAC and MP3 for general use.
Family
Audio Files
Extension
.wma
MIME Type
audio/x-ms-wma
Can Use As
HOW WMA
CAME TO BE.
Windows Media Audio was Microsoft’s bet on owning the digital music stack. Released in 1999 alongside Windows Media Player 7, WMA was pitched as a better-sounding alternative to MP3 at half the bitrate — and paired with Windows Media DRM, it was also Microsoft’s answer to the iTunes Store.
For a few years in the early 2000s it looked like WMA might win: Napster-after-lawsuits, Yahoo! Music, Rhapsody, and Walmart Music all ran on WMA with DRM. Then the iTunes Store launched (2003), the iPod ate the portable market, and WMA’s advantage evaporated. Microsoft kept shipping Windows Media Player until Windows 11 deprecated it in 2021. Today WMA files are a reminder of a parallel universe where Microsoft won consumer audio.
CURIOSITIES &
TRIVIA.
WMA was specifically engineered to sound better than MP3 at 64 kbps — early marketing claimed "CD quality at half the size".
WMA Lossless exists but never gained traction outside Windows; FLAC won that fight.
WMA DRM was notoriously aggressive: files purchased from Yahoo! Music became unplayable when Yahoo shut the store in 2008.
Microsoft's "Plays for Sure" program — guaranteeing WMA playback across devices — famously excluded Microsoft's own Zune player.
Windows 11 (2021) deprecated Windows Media Player in favor of the Media app — ending WMA's 22-year run as default.
STRENGTHS &
LIMITATIONS.
Strengths
- Good quality at low bitrates (32-64 kbps) — outperformed MP3 in that range.
- Native playback on every Windows version 2000 through 10.
- Lossless variant available (WMA Lossless) for archiving.
- Supports multichannel 5.1 surround audio.
Limitations
- Proprietary — poor support outside Windows and Windows Media Player.
- DRM variants made files brittle — many purchased tracks became unplayable when stores shut down.
- Ecosystem abandoned — no modern editors, hardware decoders, or streaming services use WMA.
- Windows 11 deprecated Windows Media Player entirely.
Typical Sizes & Weights
3-min song (128 kbps)
3 MB
3-min song (Lossless)
25-35 MB
1-hour talk (64 kbps)
28 MB
Technical Specifications
- MIME type
- audio/x-ms-wma
- Extension
- .wma
- Container
- ASF (Advanced Systems Format)
- Variants
- WMA Standard, WMA Pro, WMA Lossless, WMA Voice
- Max bitrate
- 768 kbps (WMA Pro)
CONVERT FROM
WMA
CONVERT TO
WMA
Common Use Cases
Legacy Windows audio, corporate media libraries.
Related Formats
Popular comparisons
WMA vs MP3
Differences, file size, and when to choose each format.
WMA vs WAV
Differences, file size, and when to choose each format.
WMA vs FLAC
Differences, file size, and when to choose each format.
WMA vs AAC
Differences, file size, and when to choose each format.
WMA vs M4A
Differences, file size, and when to choose each format.
WMA vs OGG
Differences, file size, and when to choose each format.
Popular WMA conversions
The most-requested destinations when starting from WMA.
Frequently Asked Questions about WMA
Frequently Asked Questions
WMA (Windows Media Audio) is an audio file format used to store sound recordings — music, voice, podcasts, sound effects. The format defines how the audio samples are compressed (or stored raw), what bitrates are supported, and how metadata such as title, artist, album, and cover art is embedded. It is part of the audio files family.
VLC, foobar2000, and the default media players on Windows and macOS handle WMA natively. On mobile, iOS Music and Android media apps vary in their support — popular formats work everywhere; niche ones may need a dedicated app. If playback fails on a device, converting to MP3 or AAC usually solves it.
Upload the WMA to KaijuConverter and pick MP3, WAV, FLAC, AAC, OGG, or any other target. Our FFmpeg pipeline decodes the audio and re-encodes to the target format at sensible default bitrates (VBR ~190 kbps for music, 96 kbps for speech). Metadata and cover art travel with the audio where both formats support them.
WMA can be lossy or lossless depending on the specific variant. Lossy variants (smaller files) discard some audio detail during compression in ways tuned to be inaudible; lossless variants preserve every sample exactly but produce larger files. For distribution, lossy at high bitrate is standard; for archival, lossless wins.