WMA to AAC Converter
Convert WMA to AAC free — no upload, no signup
To convert WMA to AAC, 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. Convert WMA to modern AAC.
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 AAC
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 AAC file or all of them as one ZIP.
Why convert WMA to AAC?
AAC is supported by Apple, Android and streaming tools; WMA isn't.
What happens when you convert WMA to AAC?
The audio is re-encoded to AAC at 160 kbps.
How does Fylo convert WMA to AAC?
Fylo decodes the WMA audio in the WMA with ffmpeg compiled to WebAssembly and encodes it with FFmpeg's AAC encoder at 160 kbps, written as a raw ADTS stream. 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 AAC. The original sample rate and channel layout are kept unless you change them under Advanced.
What's the difference between WMA and AAC?
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.
AAC (Advanced Audio Coding) was standardised in 1997 as part of MPEG-2 and later MPEG-4, designed to replace MP3. It achieves better quality at the same bitrate, especially below 128 kbps. A .aac file is usually a raw ADTS stream; the same audio inside an MP4 container is called M4A.
Learn more: WMA format guide · AAC format guide
| Property | WMA | AAC |
|---|---|---|
| Compression | Lossy (also Pro/Lossless variants) | Lossy |
| Typical bitrate | 64–192 kbps | 96–256 kbps |
| 3-minute song | ≈ 3.6 MB at 160 kbps | ≈ 3.6 MB at 160 kbps |
| Tags and cover art | Yes | Limited in raw .aac (full in M4A) |
| Compatibility | Windows; poor on Mac, iPhone and browsers | Very wide: Apple, Android, YouTube, browsers |
| Best for | Old Windows Media Player libraries | Efficient music and video soundtracks |
| Introduced | 1999 | 1997 |
Frequently asked questions
Raw AAC or M4A?
Choose WMA to M4A for music libraries.
Are DRM files supported?
No.
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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