Free online WMA to AA3 converter

What the WMA format is

WMA, or Windows Media Audio, is a lossy audio format developed by Microsoft. Windows Media Player and older Microsoft-based music stores, ripping tools, and portable players commonly created .wma files. WMA may contain standard audio, voice audio, or DRM protection; protected files generally cannot be converted until their licensing restrictions are removed legally by the original software.

What the AA3 format is

AA3 is a Sony ATRAC3 audio file used by older Sony music software and hardware, especially SonicStage and ATRAC-compatible portable players. It is closely associated with Sony's OpenMG container, so related files may use the .oma extension instead. ATRAC3 supports relatively small files at moderate bitrates, but current phones, media players, and desktop applications have limited native support.

How to convert WMA to AA3

Use the built-in online converter

1. Open the WMA-to-AA3 converter on 101convert.com.
2. Select or drop the source .wma file.
3. Choose AA3 as the output format and start the conversion.
4. Download the resulting file and test it in the intended Sony software or device.

This is the simplest method because it does not require installing an ATRAC encoder. Do not upload DRM-protected or confidential recordings unless the service's handling of those files is acceptable.

Use desktop software when an offline workflow is required

Legacy Sony SonicStage can import some unprotected WMA files and encode them as ATRAC3 for compatible Sony libraries or devices. Install it only from a trusted, legally obtained source, then use its import and ATRAC3 transfer or conversion function; exact menu names depend on the SonicStage release. SonicStage may create .oma rather than .aa3, and newer Windows versions may not run it reliably.

FFmpeg is useful for testing whether a local build can encode ATRAC3, but support is build-dependent. Check the available encoders with:

ffmpeg -encoders | findstr atrac

On macOS or Linux, use:

ffmpeg -encoders | grep -i atrac

If an ATRAC3 encoder and the Sony OpenMG/OMA muxer are both available, a possible command is:

ffmpeg -i input.wma -c:a atrac3 -b:a 132k -f oma output.aa3

Some FFmpeg builds decode WMA but cannot encode ATRAC3 or write a Sony-compatible container. A file renamed from .oma to .aa3 is not necessarily equivalent to a correctly generated AA3 file.

Quality and compatibility limitations

WMA-to-AA3 is normally a lossy-to-lossy conversion: the decoded WMA audio is compressed again with ATRAC3, so it cannot restore quality already discarded by the source. Use the highest practical ATRAC3 bitrate supported by the target device, and retain the original WMA as the archival copy.

Test the output on the exact player or SonicStage version that will use it. AA3 support is uncommon in modern software, and some Sony devices require OpenMG metadata, database registration, or transfer through SonicStage rather than accepting a copied file. Variable-bitrate WMA, DRM-protected WMA, damaged metadata, and unusual sample rates can also prevent conversion or playback.