Convert MP3 to M4A
Convert MP3 files to M4A in seconds. Free, no upload, no watermark. Trim, compress or edit before you convert.
or drag & drop videos, audio or images here, or paste with Ctrl+V
MP4 · MOV · MKV · AVI · WebM · WMV · FLV · GIF · MP3 · WAV · M4A · and 40+ more
- Files never leave your device
- No sign-up, no watermark
- Free forever
How to convert MP3 to M4A
- Add your MP3 fileClick “Choose files” or drag & drop your MP3 file onto the page.
- Check the outputM4A is pre-selected. Optionally trim, crop, compress or tweak quality in the tabs.
- Convert & downloadClick “Convert & download”. Your M4A file is created on your device and saved instantly.
MP3 vs M4A
Short answer: M4A is AAC audio in an MP4 container. It sounds better than MP3 at the same size and is the default on Apple devices.
What is MP3?
MP3 is the universal audio format. Every music player, car stereo and phone can play it.
What is M4A?
M4A is AAC audio in an MP4 container. It sounds better than MP3 at the same size and is the default on Apple devices.
Quality
M4A is lossless, so the converted file keeps all of the quality in your MP3 file. It can't add back detail that MP3 compression already removed, though.
| MP3 | M4A | |
|---|---|---|
| Full name | MPEG-1 Audio Layer III | MPEG-4 Audio |
| Type | audio | audio |
| Best for | Music, podcasts and maximum compatibility | iPhone, iTunes and high-quality compressed audio |
| MIME type | audio/mpeg | audio/mp4 |
Last updated 2026-11-13
MP3 to M4A: FAQ
Is this MP3 to M4A converter free?
Yes. Converting MP3 to M4A is completely free with no watermark, no sign-up and no file limits beyond what your device can handle. Optional Pro features like 4K export and AI subtitles are available if you need them, and a single 4K export can be unlocked without a subscription.
Are my MP3 files uploaded to a server?
No, never. The conversion runs entirely in your web browser using FFmpeg compiled to WebAssembly. Your MP3 file never leaves your computer or phone, and we never store it, which makes it private and fast.
Will I lose quality converting MP3 to M4A?
M4A is lossless, so the converted file keeps all of the quality in your MP3 file. It can't add back detail that MP3 compression already removed, though.
How do I convert MP3 to M4A on iPhone or Android?
Open this page in Safari or Chrome on your phone, tap “Choose files”, pick your MP3 file and tap “Convert & download”. No app install needed.
Can I convert multiple MP3 files to M4A at once?
Yes. Select several files and click “Convert all”. You can download them one by one or as a ZIP. Free users can batch-convert up to 5 files at a time; Pro removes the limit.
Can I edit the MP3 before converting?
Yes: trim, cut, crop, rotate, resize, change speed, adjust colour, add text, music or subtitles, and more, all before you export to M4A.