MP3 to M4A for Email

Email attachments have size limits — usually 25MB. MP3 files can still be too large. Convert to M4A to shrink them down and send without issues.

MP3M4A

Drop your MP3 file here or click to browse

MP3 (.mp3) · Max 20 MB

Gmail, Outlook, and Yahoo all cap attachments at 25MB. A long MP3 file can exceed that easily. Converting to M4A at 128kbps keeps file sizes well under the limit.

For voice recordings and meetings, 128kbps mono is plenty. For music, 192kbps stereo sounds great and stays small. AudioUtils converts in your browser — no upload needed, no file touching anyone's server.

Drop your file, convert, download, attach. The whole process takes seconds. No signup, no email address required, no watermarks.

Frequently Asked Questions

Is M4A better than MP3?

At the same bitrate, M4A (AAC) sounds noticeably better than MP3. AAC is a newer, more efficient codec.

Will M4A play on Android?

Yes. Android has supported M4A/AAC natively since early versions. It's not just an Apple format.

What's the difference between M4A and AAC?

AAC is the codec. M4A is the container (file format). M4A files contain AAC-encoded audio, similar to how MP4 contains video.

Should I convert my whole library to M4A?

Only if you primarily use Apple devices and want marginally better quality. Converting between lossy formats always involves some quality loss, so it's best to convert from lossless sources when possible.