AAC to WMA Converter

Convert AAC to WMA Online

This converter re-encodes AAC audio into a Windows Media Audio (.wma) file. Be clear on one thing first: both AAC and WMA are lossy formats, so this is a generational re-encode — the output is decoded from your already-compressed AAC and squeezed again, which can only lose quality, never recover it. AAC is also the newer, more broadly supported codec, so the only good reason to do this is a specific legacy target that demands .wma: an old Windows Phone, an older Windows Media Player library, or a car head unit or hardware player that lists WMA but not AAC. If you just need wider playback on old devices, convert AAC to MP3 instead — MP3 is supported almost everywhere WMA is and then some.

How to Convert AAC to WMA

1. Upload Your AAC File: Drag and drop your .aac file onto the page or click "+ Add Files" to browse. You can queue several files and convert them in one batch.
2. Set the Bitrate: Open Advanced Options and choose how the WMA is encoded — pick a Quality Preset (default "Highest"), set a Constant Bitrate such as 128 or 192 kbps, or enter a Custom Bitrate. Matching or exceeding your source AAC's bitrate limits extra loss; going lower throws away more.
3. Adjust Audio Channel or Sample Rate (Optional): Leave Audio Channel and Audio Sample Rate on "Original" to preserve the source, or downmix to mono and lower the sample rate for a smaller file. The Trim control can clip the output to a start point and duration.
4. Convert and Download: Click "Convert" and download your WMA file. No sign-up, no watermark.

AAC vs WMA at a Glance

This converter encodes the WMA Standard codec (FFmpeg's WMA v2 by default, with WMA v1 selectable) — it does not produce WMA Pro or WMA Lossless output.

Frequently Asked Questions

Will converting AAC to WMA reduce the audio quality?

Yes, to some degree. Both formats are lossy, so the encoder decodes your AAC, then re-compresses it as WMA. Each lossy pass discards some detail, and the second pass cannot rebuild what the first one removed. Choosing a WMA bitrate at or above your source AAC bitrate keeps the added loss small, but it is never truly transparent — if quality matters most, keep the original AAC.

Why would I convert to WMA when AAC is the more modern format?

Only for a device or program that specifically needs .wma. WMA is a proprietary Microsoft codec from 1999 that has been in decline for years, with no native support on Apple devices. Practical reasons to convert include an older Windows Phone, a legacy Windows Media Player or PlaysForSure library, or a car head unit or older hardware player whose specs list WMA but not AAC. For everything else, AAC or MP3 is the better target.

What bitrate should I pick for the WMA output?

Match your source where you can. If your AAC is around 128 kbps, encoding WMA at 128 kbps or higher avoids stacking heavy extra loss; pushing the WMA below the source bitrate discards noticeably more. In our testing, a 3-minute 128 kbps AAC track re-encoded to 128 kbps WMA stayed close in size — roughly 2.7 MB to 2.9 MB — because the bitrates are similar. Picking a much lower WMA bitrate is only worth it when you specifically need a smaller file.

Does the converted WMA keep my title and artist tags?

WMA stores metadata in Microsoft's Advanced Systems Format (ASF) container, while AAC typically carries tags in an MPEG-4/iTunes-style structure. Common fields such as title and artist usually carry across, but less standard tags or embedded album art may not map cleanly between the two systems, so check the tags in your target player after converting.

Is this AAC to WMA converter free and private?

Yes. There is no sign-up, no watermark, and no file-count limit. Your file is uploaded over an encrypted connection, converted on our servers, and deleted automatically a few hours after conversion — it is never shared or made public. The main practical limit on a big file is upload size and time, not your device.