WMA to AAC

To convert WMA to AAC, open the WMA to AAC converter, pick your quality from the Bitrate dropdown (96k, 128k, 192k recommended, 256k, or 320k), then drag and drop your WMA files onto the drop area or click it to choose them. Conversion starts automatically and runs entirely in your browser. Set the bitrate before you add files, since it is read as each file is converted. Your files are processed one after another, and every finished AAC file appears in its own row with the new filename, its size, an inline preview player, and a Download button. Nothing is uploaded — the conversion happens locally using a WebAssembly build of FFmpeg.

Yes, a small amount. WMA and AAC are both lossy formats, so the conversion decodes your WMA and compresses it again, which discards a little extra data along the way. At 192 kbps or higher the difference is very hard to hear, and AAC is generally more efficient than MP3 at the same bitrate. What no conversion can do is recover detail the original WMA encode already threw away, so the AAC file can only ever be as good as its source. Choosing a bitrate at or above the WMA's own is the safest approach.

It is completely free and completely private: there is no signup, no account, no watermark and no software to install, and your audio never leaves your device because the conversion runs on a WebAssembly build of FFmpeg inside your own browser instead of on a server. That makes it safe for confidential recordings such as interviews, lectures or voice memos. The only thing your browser downloads is the converter itself, a one-time ~32 MB file that is cached afterwards.

WMA is Microsoft's own format and support for it barely exists outside Windows, so iPhones, most Android music apps and the majority of car stereos and Bluetooth players will not open a .wma file at all. Converting to AAC fixes this, because AAC is the standard on Apple devices and is supported almost everywhere else too. AAC is the natural target if your library is heading onto an iPhone, iPad or into Apple Music. If you need compatibility with very old hardware, MP3 is the safer bet.

192 kbps is the default and gives a good balance of quality and file size for music coming from a WMA source. Pick 256 or 320 kbps if you want to preserve as much of the original as possible, or drop to 96 or 128 kbps for speech, podcasts and voice memos where a small file matters more. Because your WMA is already lossy, a very high bitrate cannot add quality back, it only avoids adding more loss. The available options are 96, 128, 192, 256 and 320 kbps.

There is no size limit imposed by the site, because your files are never uploaded anywhere; the only real limit is your own device's memory. You can also drop in as many WMA files as you like at once and they will be converted one after another, each with its own preview and download. Very large files, roughly a few hundred MB and up, can be slow or exhaust memory on a phone. For long recordings such as full lectures or DJ sets, use a desktop browser.

Yes. It runs in any modern browser on Windows, Mac, Linux, iPhone and Android, with nothing to install on any of them, because the converter loads as a WebAssembly module the first time you use it and is then cached by the browser so later conversions start instantly. This is especially handy on a Mac or iPhone, where WMA playback support is essentially absent. Phones handle short and medium files fine; save very long recordings for a desktop browser.