Convert MP3 to M4A
Drop an MP3 and get an M4A (AAC) file back — the format preferred by Apple devices, iTunes, and most modern media players. The first time you use this tool the audio engine downloads once (~24 MB); after that the browser uses its cached copy. Your file never leaves your device.
About MP3 to M4A
Both MP3 and M4A (AAC inside an MPEG-4 container) are lossy compressed formats, so converting between them involves re-encoding: the MP3 is decoded and then encoded again as AAC at 192 kbps. Because both formats are lossy, each encode removes a little more detail — the quality loss is small at these bitrates but real. The main practical reason to convert is compatibility: M4A is the native format for Apple Music, iOS, and macOS, and AAC generally achieves slightly better quality than MP3 at the same bitrate.
Is it private?
Yes. The converter is WebAssembly and browser APIs running on your own machine. Nothing is uploaded, stored, or seen by us — there is no server to send files to.
Frequently asked questions
- Does converting MP3 to M4A improve the quality?
- No. Both MP3 and M4A are lossy formats, so the audio is decoded and re-encoded as AAC at 192 kbps. The quality loss is small at this bitrate but real, and detail already lost in the MP3 cannot be recovered.
- Are my files uploaded to a server?
- No. The conversion runs on your device using WebAssembly and browser APIs. Your file is never sent anywhere, and the tool keeps working even if you go offline after the audio engine has loaded.
- Is it free, and do I need an account?
- It is free with no watermarks, no daily caps, and no sign-up. Drop a file, convert it, and download the result.
- Why does the first conversion take a moment to start?
- The first time you use this tool the audio engine downloads once (about 24 MB). After that the browser uses its cached copy, so later conversions start right away.