Free online WMA to AAC converter

Convert WMA audio to AAC or M4A, with FFmpeg commands, bitrate choices, and compatibility limits.

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How to convert wma to aac file

August 13, 2026
Audio
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Older Windows media libraries and recorders often produce .wma files that Apple devices, editors, and AAC-based playback systems cannot import. Converting them to AAC provides a more widely supported lossy audio format, usually delivered as .m4a when the receiving software supports that container.

WMA and AAC formats

WMA (Windows Media Audio) is a Microsoft audio codec family associated with Windows Media Player, Windows Media Encoder, older Windows music libraries, and enterprise media systems. Files with the .wma extension can contain WMA Standard, WMA Pro, WMA Voice, or WMA Lossless audio; WMA Voice is intended for low-bitrate speech.

AAC (Advanced Audio Coding) is a lossy audio codec used in MP4-based audio and video, mobile devices, streaming services, and many editing applications. AAC-LC is the usual profile for music and general audio because it has broad decoder support and generally performs efficiently at common bitrates.

AAC is a codec, not a single file container. Raw AAC files normally use the .aac extension and ADTS framing, while AAC audio in an MP4 container normally uses .m4a. Use .m4a when the destination accepts it, because it supports standard metadata such as title, artist, album, and cover art more reliably than raw AAC.

Convert the file

Upload the .wma file to 101convert.com, select AAC as the output format, start the conversion, and download the converted file. Confirm the required extension before uploading: a device that explicitly requests .aac may not accept an AAC file packaged as .m4a, and the reverse is also common.

For local or batch conversion, FFmpeg can create AAC-LC in an M4A container:

ffmpeg -i input.wma -c:a aac -profile:a aac_low -b:a 192k output.m4a

For a raw AAC file:

ffmpeg -i input.wma -c:a aac -profile:a aac_low -b:a 192k output.aac

For mono speech, a lower bitrate is normally sufficient:

ffmpeg -i interview.wma -c:a aac -profile:a aac_low -b:a 64k interview.m4a

Do not change sample rate or channel count unless required by the receiving application. If 44.1 kHz is mandatory, add -ar 44100; use -ac 2 only when stereo output is specifically required.

Quality and compatibility limits

Most WMA files are already lossy, so conversion to AAC is a lossy-to-lossy transcode. It cannot restore detail removed by WMA encoding, and a second encode can add artifacts. Keep the original file, particularly when it is the only available source.

For stereo music, 128–160 kb/s AAC is commonly used for compact files; 192–256 kb/s reduces the risk of additional audible loss during transcoding. Raising the AAC bitrate above the WMA source bitrate does not restore source quality, but it can avoid further aggressive compression.

WMA Lossless can be converted to AAC for compatibility, but AAC-LC is not lossless. Preserve the original WMA Lossless file, or create a separate FLAC archive, when lossless retention matters.

Some older WMA files are DRM-protected. A converter or FFmpeg may be unable to decode protected files, and conversion may be restricted by the content license; use the original service or authorized playback software where applicable.

WMA vs AAC: format comparison

How the WMA and AAC formats compare on the properties that matter most for this conversion.

Comparison of the WMA and AAC file formats
Property	.WMA Windows Media Audio	.AAC Advanced Audio Coding
Compression	Lossy	Lossy
Audio quality	Medium	High
Audio channels	Up to stereo	Up to stereo
Metadata support	Basic	Basic
Streaming	Yes	Yes
DRM protection	Optional	Optional
Opens in a web browser	No	Partial
Typical file size	Small	Small
Open standard	No	Partly open
Best used for	Music	Music
Introduced	1999	1997
Developer	Microsoft	Fraunhofer IIS, Sony, Dolby, AT&T, Nokia, and others
MIME type	audio/x-ms-wma	audio/aac

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Frequently asked questions

Is the WMA to AAC converter free?

Yes, converting WMA to AAC on 101convert.com is completely free. No registration, email address or installation is required.

How large can my WMA file be?

You can upload WMA files up to 1000 MB and convert up to 100 files at once in a single batch.

What happens to my uploaded files?

Files are processed automatically and deleted from our servers within a few minutes after conversion. We never view or share your files.

Do I need to install any software to convert WMA to AAC?

No. The WMA to AAC conversion runs entirely online in your browser and works on Windows, Mac, Linux, Android and iPhone.

Did the conversion fail?

In most cases, the cause is an incorrect file format. Please upload a valid WMA file for this WMA to AAC conversion. Occasionally, the issue may be on our side. We analyze recurring conversion failures and disable or fix the converter if we detect a defect.

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Additional formats for
wma file conversion

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