Convert MP3 to M4A.
MP3 re-encoded to Apple-native M4A — on your own device.
Drop MP3 files here
or browse your files
Paste with ⌘V · or drop files anywhere on the page
Files never leave your device. Everything runs in your browser, nothing touches a server — tools you've used even work offline.
Convert MP3 files to M4A (AAC) entirely in your browser — no uploads, no accounts. M4A is the native audio format of the Apple ecosystem and the container audiobook and podcast tooling prefers; the re-encode happens on your own device.
How it works
- Drop files anywhere on the page, click to browse, or paste with ⌘V.
- Pick a quality or preset — or set an exact target size and let the tool find it.
- Compress, compare before/after, and download — individually or as a ZIP.
When M4A makes sense — and when it does not
M4A/AAC is what iPhones, iTunes and audiobook apps speak natively, and some of them accept nothing else. But this is a lossy-to-lossy re-encode: quality cannot improve, only the packaging changes — so keep the MP3 masters and convert only where a tool demands M4A. The reverse trip is M4A to MP3; everything size-focused lives on Compress audio.
Frequently asked questions
Will my audio sound better as M4A?
No — re-encoding lossy audio cannot restore what MP3 encoding removed. AAC holds quality slightly better at matching bitrates, but converting existing MP3s is about compatibility, not fidelity.
Why do some apps insist on M4A?
Apple tooling, audiobook chapters and some podcast pipelines are built around the MP4 audio container. M4A slots in natively where MP3 gets refused or re-processed.
What bitrate should I use?
Match or exceed the source — 192 kbps is a safe default that avoids stacking audible loss on top of the original encode.
Is it private?
Yes. The audio is decoded and re-encoded entirely in your browser — recordings never leave your device, and the server does nothing but deliver this page. Voice memos, interviews, demos: none of it is uploaded anywhere. Want proof? Run one file through, switch your connection off, and run another — it still works.