Upload a WMA file and get a M4A back. No signup, no watermark, no limit on how many.
WMA is Microsoft's lossy format from the Windows Media era, and it is the reason a great many CD collections ripped between 2000 and 2010 are now awkward to play.
Where you run into it: Old Windows Media Player rips, corporate archives, CDs backed up on a PC two laptops ago.
What it costs you: Support outside Windows ranges from poor to none: phones, Macs and car stereos mostly will not open it, which is why it is nearly always a source and never a destination.
M4A is an MPEG-4 container holding AAC audio — the same codec as a bare .aac file, wrapped so that players, tags and cover art all behave.
Where you run into it: iTunes and Apple Music purchases, voice memos, Zoom and Teams recordings, most phone-recorded audio.
What it costs you: Outside Apple's ecosystem support is good but not universal, and a few older tools still refuse the extension on sight.
This is the least compatible starting point on the site meeting one of the most particular destinations. Apple's software does not play WMA at all, so a Windows Media library is simply invisible to an iPhone, an iPad or the Music app until it becomes something else. Encoding it as AAC inside an MP4 container is what makes it visible. The audio is decoded and re-encoded on the way, so unless your file is WMA Lossless you are spending a generation to cross an ecosystem boundary.
The practical shape of this job is usually a bulk one: a music folder from an old Windows laptop that now has to live on a phone. Two things make it go smoothly. Sort out which files are standard WMA and which are WMA Lossless first, because the lossless ones deserve a higher setting and the 128 kbps ones do not need 320. And expect the tags to come across — artist, album and title all survive, so a library that was organised in Windows Media Player arrives organised, which is most of the work you would otherwise be redoing by hand.
Yes, entirely, and there is no cap on how many files you convert. No account, no watermark, no trial.
A little, and less than the same trip through MP3 would cost you. AAC gets more out of each kilobit than either WMA or MP3, so at Best — a flat 192 kbps — it holds on to what a 128 kbps WMA still had with room to spare. That efficiency is the reason to prefer this target when the destination is Apple hardware: you are spending a second encode, so you may as well spend it on the codec that wastes the least.
Rather larger than the WMA, typically half again, because 192 kbps against a 128 kbps source is a deliberate overshoot. That is the correct way round for a second-generation encode — asking AAC to match the source's number would compound the first encoder's decisions rather than preserve them. Pick a lower rate from the list only if the destination is short of space and the material is speech.
Not here. WMA can be read but not written by this converter — ffmpeg decodes it happily, and encoding back to it would mean a format almost nothing plays. If you need the original WMA, keep it rather than recreating it.
The file is uploaded to do the conversion — nothing here runs in your browser — and both your upload and the converted result are deleted the moment the file is sent back. Nothing is stored and nothing is logged beyond the request itself.