Convert MP3 to M4A, Free
Files convert instantly in your browser. 100% private, any file size, no account needed.
Drop your MP3 file here
or click to browse. Any file size.
Conversion runs entirely in your browser. Your file never leaves your device.
How to convert MP3 to M4A
M4A is Apple's AAC audio container, supported natively on all Apple devices and in iTunes, Final Cut Pro, and Logic Pro. Converting MP3 to M4A (AAC) makes sense when you want better audio quality at the same or smaller file size: AAC achieves comparable perceived quality to MP3 at roughly 75 percent of the bitrate. It also integrates better into Apple ecosystem workflows.
The conversion runs in your browser via WebAssembly. Your audio never leaves your device, and there is no file-size cap. Note that re-encoding a lossy MP3 to another lossy format (AAC) does introduce some additional quality degradation, so work from the highest-quality source available.
Upload your MP3
Drop your .mp3 file into the converter. The WebAssembly decoder reads the compressed audio locally.
Set AAC bitrate
Choose the target bitrate. 128 kbps AAC is comparable to 192 kbps MP3 in perceived quality. 256 kbps AAC is iTunes Plus quality.
Convert
The engine decodes the MP3 and re-encodes it as AAC inside an M4A container.
Download the M4A
Click Download to save the .m4a file. It is ready for any Apple device, iTunes, or AAC-compatible player.
Frequently asked questions
Does MP3 to M4A improve audio quality?
No. Both are lossy formats. Re-encoding applies compression a second time. The M4A may be smaller at comparable perceived quality, but the original MP3 audio information that was discarded is not recovered.
Why use M4A over MP3?
AAC is more efficient: better quality per kilobit. It is also the native format for Apple devices, avoiding re-transcoding when playing through iTunes or AirPlay.
Is my audio uploaded to a server?
No. Processing is local via WebAssembly in your browser.
Will M4A work on Android?
Android has supported AAC/M4A since Android 3.1. Most modern Android media players also handle M4A without issue.
What is the difference between M4A and AAC?
AAC is the codec (the compression algorithm). M4A is a file container (MPEG-4 audio) that stores AAC audio. When people say M4A they usually mean AAC audio in an MPEG-4 container.