Convert Standard MIDI (.mid) to Windows Media Audio (.wma) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .mid file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .wma file when it's ready.
MID (Standard MIDI File) is a 1983 music notation format that stores performance instructions — note events, velocities, timing, instrument selections, controller data — without any audio content. MIDI files are tiny (10-100 KB) because they encode instructions for synthesizers, not sound waves. The audible result depends entirely on whichever synthesizer renders the MIDI data.
WMA (Windows Media Audio) is Microsoft's proprietary audio codec, widely deployed across the Windows ecosystem. Converting MID to WMA renders the MIDI performance through a software synthesizer and encodes the audio using the Windows Media Audio codec in an ASF (Advanced Systems Format) container. This produces Windows-native audio from MIDI instructions.
WMA is the native audio format for Windows Media Player and deeply integrated into the Windows ecosystem — Windows Explorer shows WMA metadata natively, Windows Media Center plays WMA without codecs, and many Windows-based media servers prefer WMA. For organizations standardized on Microsoft infrastructure, WMA is the expected audio format.
WMA also supports DRM (Digital Rights Management), which is relevant for MIDI-rendered music that needs controlled distribution. While DRM is less common today, some enterprise and educational content delivery systems still require WMA with licensing controls.
FFmpeg decodes the MIDI event stream using its built-in decoder and synthesizer, rendering all 16 MIDI channels to stereo PCM through SoundFont instrument patches. The PCM audio is encoded using the wmav2 (Windows Media Audio v2) codec at the target bitrate. The encoded stream is wrapped in an ASF container with proper header objects (file properties, stream properties, content description) and data packets.
WMA Standard at 192 kbps provides good quality for synthesized MIDI content, though at equivalent bitrates AAC and Vorbis generally outperform WMA in listening tests. WMA Pro and WMA Lossless offer higher quality and lossless options respectively, but compatibility is limited. The SoundFont quality remains the primary factor — WMA encoding is transparent at 192+ kbps for synthesized material.
| Device | MID | WMA |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
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
MID to WMA renders MIDI instructions into Microsoft's native audio format. This conversion serves Windows-centric workflows where WMA is the expected or required audio format.
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| No |
| Funktion | MID | WMA |
|---|---|---|
| Fulde navn | Standard MIDI File | Windows Media Audio |
| Filendelse | .mid | .wma |
| Bedst til | Musical performance data | Windows native |