Convert MP3 to M4A
Turn MP3 files into M4A in seconds. Up to five at a time, private and free.
1 · Choose your files
Drag & drop audio or video files here, or click to browse
Up to 5 MP3 files, max 200 MB each
2 · Pick the output
All processing runs on your own device with ffmpeg compiled to WebAssembly; nothing is uploaded.
3 · Collect your files
Results appear here with a player. Download them one by one or grab everything as a ZIP.
How to convert MP3 to M4A
- Drop your MP3 files into the box above, or click it to browse.
- M4A is already selected as the output. For lossy formats, 192 kbps is a good balance between size and quality.
- Click Convert to M4A, then download each result or grab them all as a ZIP.
About the MP3 format
MP3 (MPEG-1 Audio Layer III) is the most widely supported audio format there is: every phone, car stereo, browser and player reads it. It is lossy, storing music at a fraction of the size of the original by removing detail the ear is least likely to notice. At 192 kbps or more it is transparent for most listeners.
About the M4A format
M4A is the audio-only MP4 container, almost always carrying AAC audio. It is Apple's native format (iTunes, Apple Music, iPhone ringtones) and sounds better than MP3 at the same bitrate. Every modern device plays it.
Frequently asked questions
Why convert MP3 to M4A?
M4A (AAC) sounds better than MP3 at the same bitrate and is the native format of Apple devices. MP3 files are lossy and comparatively large for their quality; each re-encode loses a little more.
Does converting MP3 to M4A lose quality?
M4A uses lossy compression, so a little detail is discarded to make the file smaller. At 192 kbps or higher the difference is inaudible for most listeners; choose 320 kbps for the safest result.
Which bitrate should I choose?
192 kbps is transparent for most music and the default here. Use 320 kbps to archive or for critical listening, and 128 kbps for speech, where the difference is inaudible and the file is a third smaller.
Can I convert several MP3 files at once?
Yes. Add up to 5 files of up to 200 MB each, convert them in one go and download the results one by one or as a ZIP.
Are my files uploaded?
No. The conversion runs in your browser with ffmpeg compiled to WebAssembly. Your MP3 files never leave your device.
Is this MP3 to M4A converter free?
Yes, completely, with no sign-up and no watermark. The site is supported by ads.
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