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One file at a time for now
Batch processing isn't available yet: drop files one by one, or use the Merger to join them.
Converting WMA to M4A is free: drop your WMA above, hit convert, and download the M4A. Files delete themselves within an hour.
WMA and M4A are both lossy formats, so flipping WMA to M4A is really about compatibility: getting your audio into a shape the stubborn device or app will actually take. Where WMA struggles with the modern world: Apple devices, browsers and most apps have moved on, M4A earns its keep: it's built for sounding great anywhere in the Apple ecosystem.
Small print: WMA and M4A are both lossy, so every re-encode shaves off a little more. Convert once, from the best source you have: not repeatedly.
WMA is Windows' old house band: big in the early 2000s, mostly retired now. It was born in 1999, Microsoft, and its real weak spot is the modern world: Apple devices, browsers and most apps have moved on.
M4A is AAC in Apple's favorite outfit: the audio-only MP4 your iPhone speaks natively. An MP4 container holding only audio: usually AAC, occasionally Apple's lossless ALAC. That makes it the right destination when what you need is sounding great anywhere in the Apple ecosystem.
Drop your WMA file into the flipper above, or click to browse for it.
Check the output format: M4A is already selected for you.
Hit Convert, give it a moment, then download your new M4A.
| WMA | M4A | |
|---|---|---|
| Born | 1999, Microsoft | 2003, popularized by Apple's iTunes Store |
| Type | audio · lossy | audio · lossy |
| Best for | keeping aging Windows Media software and old archives happy | sounding great anywhere in the Apple ecosystem |
| Weak spot | the modern world: Apple devices, browsers and most apps have moved on | older Windows software and stubborn car stereos that expect a .mp3 |
| Typical size | MP3-ish sizes; the famous 'CD quality at 64 kbps' claim never quite landed | like AAC: better-than-MP3 sound at about 1 MB per minute |
| Plays on | Windows Media Player and legacy Microsoft software; little else without help. | iPhone, Mac and iTunes natively; most modern Android and Windows apps too. |
A small amount: both formats are lossy, so re-encoding trims a little detail. Converting once at a decent bitrate keeps it inaudible for most ears.
In the same neighborhood: M4A runs like AAC: better-than-MP3 sound at about 1 MB per minute, and you control the bitrate.
iPhone, Mac and iTunes natively; most modern Android and Windows apps too. That's the usual reason people leave WMA behind: M4A simply opens in more of the places that matter.
Seconds for most files: audio is light work. A long recording might take a minute; your file auto-deletes from our servers within an hour either way.