MP3 to M4A Converter
Convert MP3 audio to M4A (AAC) in your browser. Pick the bitrate, batch up to 10 files, download a ZIP. Nothing is uploaded. Free, no account, no watermark.
What this tool does
iPhones, iPads, GarageBand, and most Apple apps treat M4A as the default, and some of them refuse plain MP3. Drop up to 10 MP3 files here and get back M4A files those apps accept. The conversion runs in your browser, so the audio never leaves your device. Free, no account, no watermark.
Each file can be up to 500 MB.
How it works
- Add your MP3 files.
- Pick the AAC bitrate, or leave the default.
- Convert, then download each M4A or grab them all as a ZIP.
Supported formats
| Supported formats | MP3 |
|---|---|
| MIME | audio/mpeg, audio/mp3 |
| Max file size | 524 MB |
When to use it
Apple apps that want M4A
Ringtones, iMovie imports, and some iOS workflows expect AAC in an M4A wrapper. Convert once and import cleanly.
Matching your existing library
If your music or voice-note library is already M4A, converting stray MP3s keeps the collection consistent.
Whole batches at once
Select up to 10 MP3 files and convert them in one pass instead of one by one.
One codec family, a different wrapper.
The conversion runs entirely on your device. Nothing is uploaded, nothing is stored, and the original MP3 files stay exactly where they are.
M4A is a container, not a codec: it usually holds AAC audio. This tool decodes your MP3 and re-encodes the audio as AAC inside an M4A file, at the bitrate you pick.
One honest note: re-encoding a lossy file always adds a small generational loss, and MP3 to AAC is no exception. At 192 kbps or above it is not audible in normal use, but converting back and forth between formats repeatedly is a habit to avoid.
Going the other way? The M4A to MP3 converter handles the reverse direction. Need uncompressed PCM instead? The MP3 to WAV converter outputs it losslessly.
Frequently asked questions
Is this MP3 to M4A converter free?
Yes. Free, no account, no watermark, no daily cap.
Are my files uploaded to a server?
No. The conversion happens inside your browser using your device's audio decoder and an in-browser AAC encoder. Your files never leave your computer.
Does converting MP3 to M4A improve the quality?
No. The audio was already compressed when it was encoded as MP3, and no conversion restores what was discarded. You gain compatibility with apps that require M4A, nothing more.
Which bitrate should I pick?
AAC reaches transparency at lower bitrates than MP3, so 192 kbps is a safe default for music. Use 128 for voice, 256 or 320 if you want maximum headroom.
Why convert at all if the quality is the same or slightly worse?
Because the app you are feeding decides the format. When an iPhone workflow refuses MP3, an M4A copy is the practical fix.
How many files can I convert at once?
Up to 10 MP3 files per batch, each up to 500 MB. Run the tool again for more.
Related tools
Privacy
Your file never leaves your device.
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