MP3 to M4A Converter
Convert MP3 audio to M4A (AAC) for iPhone, iTunes and Apple Music. Batch, private, in-browser.
How to convert MP3 to M4A
- 1
Choose your MP3 files
Click the upload area or drag files onto it. Nothing is uploaded — files are opened locally.
- 2
Adjust the settings
Pick audio quality, then press the convert button.
- 3
Download the result
Save each file individually or everything at once as a ZIP.
Need M4A for iPhone, iTunes and Apple Music? Convert MP3 files on your device — nothing is uploaded, and you can convert a whole album at once.
Read the full guide with screenshotsWhat is MP3?
MP3 is the universal compressed audio format. It plays on every device, car stereo and music app with small file sizes.
What is M4A?
M4A is AAC audio in an MPEG-4 container, used by Apple Music, iTunes, Voice Memos and many phone recorders.
Is it private?
Yes. Unlike upload-based converters, ZapMorph processes files inside your browser tab, so the file stays on your device. It is never transmitted, stored or logged — close the tab and it’s gone.
Frequently asked questions
Is the mp3 to m4a converter free?
Yes, once a day. Convert one file up to 25 MB a day without an account. A free account gets one run a day on any Pro tool with files up to 50 MB; Pro and Lifetime plans are unlimited.
Are my files uploaded to a server?
No. The conversion runs entirely in your browser, so your files never leave your device. We only count how many files you convert — never their names or contents.
What is the maximum file size?
Up to 25 MB per file without an account, 50 MB with a free account, and 1 GB on Pro. Very large files also depend on your device’s memory.
Can I convert multiple MP3 files at once?
Yes. Select several MP3 files at once — up to 5 on the free plan or 50 on Pro — and download all results in a single ZIP.
Does it work on Mac, Windows, iPhone and Android?
Yes. It works in any modern browser — Chrome, Edge, Firefox and Safari — on desktop and mobile, with nothing to install.
Related converters
MP3 to WAV
MP3WAV
Convert MP3 to uncompressed WAV for audio editors, DAWs and CD burning. Private, in-browser conversion.
MP3 to OGG
MP3OGG
Convert MP3 audio to OGG (Vorbis) for Discord, games and Android. Batch, private, in-browser.
MP3 to FLAC
MP3FLAC
Convert MP3 audio to FLAC (lossless FLAC) for archiving without quality loss. Batch, private, in-browser.
WAV to M4A
WAVM4A
Convert WAV audio to M4A (AAC) for iPhone, iTunes and Apple Music. Batch, private, in-browser.
FLAC to M4A
FLACM4A
Convert FLAC audio to M4A (AAC) for iPhone, iTunes and Apple Music. Batch, private, in-browser.
OGG to M4A
OGGM4A
Convert OGG audio to M4A (AAC) for iPhone, iTunes and Apple Music. Batch, private, in-browser.