Free, in your browser, no signup: files delete themselves within an hour.
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 AAC is free: drop your WMA above, hit convert, and download the AAC. Files delete themselves within an hour.
WMA and AAC are both lossy formats, so flipping WMA to AAC 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, AAC earns its keep: it's built for streaming-grade sound at friendly file sizes.
Small print: WMA and AAC 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.
AAC is MP3's better-trained successor: cleaner sound from the same number of bits. Advanced Audio Coding: the default soundtrack of YouTube, iTunes and most MP4 video. That makes it the right destination when what you need is streaming-grade sound at friendly file sizes.
Drop your WMA file into the flipper above, or click to browse for it.
Check the output format: AAC is already selected for you.
Hit Convert, give it a moment, then download your new AAC.
| WMA | AAC | |
|---|---|---|
| Born | 1999, Microsoft | 1997, an MPEG all-star team: Fraunhofer, Dolby, Sony, AT&T and Nokia |
| Type | audio · lossy | audio · lossy |
| Best for | keeping aging Windows Media software and old archives happy | streaming-grade sound at friendly file sizes |
| Weak spot | the modern world: Apple devices, browsers and most apps have moved on | older or stubborn hardware that only ever learned MP3 |
| Typical size | MP3-ish sizes; the famous 'CD quality at 64 kbps' claim never quite landed | similar to MP3, but it sounds better at the same bitrate: or the same at about 25% smaller |
| Plays on | Windows Media Player and legacy Microsoft software; little else without help. | Apple everything, YouTube, Android, modern players; patchy on legacy gear. |
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: AAC runs similar to MP3, but it sounds better at the same bitrate: or the same at about 25% smaller, and you control the bitrate.
Apple everything, YouTube, Android, modern players; patchy on legacy gear. That's the usual reason people leave WMA behind: AAC 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.