Convert MPEG Audio Layer 3 (.mp3) to Windows Media Audio (.wma) online for free. Fast, secure audio conversion with no watermarks or registration.
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WMA (Windows Media Audio) is Microsoft's proprietary audio codec, introduced in 1999 as part of the Windows Media framework. It was Microsoft's answer to MP3 during the early digital music era, offering comparable quality at lower bitrates and integrated Digital Rights Management (DRM) — a feature that the music industry demanded but consumers generally disliked. Converting MP3 to WMA is primarily needed for compatibility with older Windows-based systems, Zune devices, and legacy Microsoft media platforms.
While WMA has been largely supplanted by AAC and Opus for modern audio delivery, it remains the native audio format for Windows Media Player, Windows Media Center, and certain enterprise media systems built on Microsoft's technology stack. Older Windows phones, Zune HD players, and Xbox 360 consoles used WMA as their preferred audio format.
The primary reason to convert MP3 to WMA in 2025 is compatibility with legacy Microsoft systems. Enterprise environments running older Windows Media Server infrastructure, digital signage systems built on Windows Embedded, or archived Windows Media Center installations may require WMA format. Some older car infotainment systems from Microsoft's Sync platform also prefer WMA over MP3.
WMA Standard at 128 kbps was considered superior to MP3 at 128 kbps in early listening tests conducted by Microsoft and third-party testers. While this advantage has been largely negated by AAC and Opus, WMA remains a competent lossy codec. For environments locked into the Windows Media ecosystem, WMA provides native integration with Windows Media Player's library management, ratings, and metadata system.
FFmpeg decodes the MP3 source and re-encodes using the Windows Media Audio 2 (WMA v2) codec via the wmav2 encoder. Default output is 128 kbps at 44.1 kHz stereo. WMA uses a modified discrete cosine transform (MDCT) similar to MP3 and AAC but with Microsoft's proprietary psychoacoustic model. The output is wrapped in the ASF (Advanced Systems Format) container, which is Microsoft's standard multimedia container.
WMA at 128 kbps provides quality roughly comparable to 128 kbps MP3. Independent listening tests show WMA Standard is marginally better than MP3 at low bitrates (64-96 kbps) but essentially equivalent at 128 kbps and above. The generation loss from MP3-to-WMA transcoding is present but typically inaudible at 128 kbps. For the best results, match or exceed the source MP3 bitrate.
| Device | MP3 | WMA |
|---|---|---|
| Windows PC | Native | Native |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Native | Partial |
| Linux | Partial | Partial |
| Web Browser | Native |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
MP3 to WMA conversion serves legacy Microsoft ecosystems that expect Windows Media format. While WMA has no technical advantage over modern codecs like AAC and Opus, it remains necessary for older Windows-based media systems, Zune devices, and enterprise Windows Media infrastructure.
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| No |
| 特徴 | MP3 | WMA |
|---|---|---|
| 正式名称 | MPEG Audio Layer III | Windows Media Audio |
| 拡張子 | .mp3 | .wma |
| 最適な用途 | Universal compatibility | Windows native |