WMA to M4A Converter
Convert WMA to M4A free — no upload, no signup
To convert WMA to M4A, drop your WMA audio files into the box below and click Convert. Fylo converts with ffmpeg running inside your browser, so nothing is uploaded and there's no signup or watermark. Move a WMA music library to iTunes and iPhone.
Drop audio files here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
Advanced
How to convert WMA to M4A
Add your WMA files
Drag and drop WMA files into the box or tap to choose them. The converter engine (about 31 MB) downloads once, the first time you convert.
Pick a bitrate
192 kbps suits music and 128 kbps or less suits speech. Sample rate and mono/stereo are under Advanced.
Convert and download
Click Convert, then download each M4A file or all of them as one ZIP.
Why convert WMA to M4A?
M4A is native to Apple Music and iPhones, so converting WMA libraries lets you play them on Apple devices.
What happens when you convert WMA to M4A?
Fylo re-encodes to AAC at 160 kbps in M4A.
How does Fylo convert WMA to M4A?
Fylo decodes the WMA audio in the WMA with ffmpeg compiled to WebAssembly and encodes it with FFmpeg's AAC encoder at 160 kbps inside an MPEG-4 (M4A) container. Both formats are lossy, so each conversion discards a little detail — start from the highest-bitrate WMA you have. A 3-minute song is ≈ 3.6 MB at 160 kbps as WMA and ≈ 3.6 MB at 160 kbps as M4A. The original sample rate and channel layout are kept unless you change them under Advanced.
What's the difference between WMA and M4A?
WMA (Windows Media Audio) was released by Microsoft in 1999 to compete with MP3 and is stored in the ASF container. Windows Media Player ripped CDs to WMA by default for years, so many older music collections are WMA.
M4A is an MPEG-4 container that holds only audio — usually AAC, or Apple Lossless (ALAC). Apple popularised the extension with the iTunes Store in 2003; iPhone Voice Memos and many podcasts also use it. Audiobooks often use the related .m4b extension.
Learn more: WMA format guide · M4A format guide
| Property | WMA | M4A |
|---|---|---|
| Compression | Lossy (also Pro/Lossless variants) | Lossy (AAC) or lossless (ALAC) |
| Typical bitrate | 64–192 kbps | 128–256 kbps |
| 3-minute song | ≈ 3.6 MB at 160 kbps | ≈ 3.6 MB at 160 kbps |
| Tags and cover art | Yes | Yes (full, with cover art) |
| Compatibility | Windows; poor on Mac, iPhone and browsers | Apple devices, Android, Windows 10+, browsers |
| Best for | Old Windows Media Player libraries | iTunes/Apple Music libraries, voice memos, audiobooks |
| Introduced | 1999 | 2003 |
Frequently asked questions
Will iTunes import the M4A?
Yes.
Can I convert many files at once?
Yes — drop your whole folder of WMA files and download a ZIP.
Is my WMA file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your WMA file is read directly from your device and never sent anywhere.
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