Convert MID to WMA — Free Online Converter
Convert Standard MIDI (.mid) to Windows Media Audio (.wma) online for free. Fast, secure audio conversion with no watermarks or registration....
Secure Transfer
HTTPS encrypted uploads
Privacy First
Files auto-deleted after processing
No Registration
Start converting instantly
Works Everywhere
Any browser, any device
How to Convert
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.
About MID to WMA Conversion
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.
Why Convert MID to WMA?
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.
Common Use Cases
- Creating rendered MIDI audio for Windows Media Player libraries and playlists
- Preparing synthesized MIDI music for Windows-based corporate media servers
- Converting MIDI compositions to WMA for compatibility with Zune or legacy Microsoft devices
- Generating audio from MIDI for Windows-centric enterprise content management systems
- Producing rendered MIDI files for legacy Windows mobile devices that natively support WMA
How It Works
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.
Quality & Performance
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 Compatibility
| Device | MID | WMA |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
Spotify
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Apple Music
Resolution: N/A
Bitrate: 256 kbps
AAC format required
SoundCloud
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Podcast
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
Tips for Best Results
- 1Use 192 kbps WMA Standard (wmav2) for the best quality-to-compatibility balance in Windows ecosystems
- 2Consider MP3 or AAC instead of WMA unless your target systems specifically require Microsoft's codec
- 3Test WMA playback in Windows Media Player before distributing — it validates codec and container correctness
- 4Embed Windows Media metadata (WM/Title, WM/Artist, WM/AlbumTitle) for proper display in Windows applications
- 5Avoid WMA for cross-platform distribution — macOS, iOS, and Linux users need third-party players to open WMA files
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.