MP3 to M4A converter
Turn MP3 files into M4A in seconds, inside this tab. Nothing is uploaded.
- Runs on your device
- No upload
- No sign-up
- Free
Drop MP3 files here (any other format works too)
Stays on this device: nothing is uploaded. You can also drag a file here or paste it.
M4A: Apple devices, better quality than MP3 at the same size.
How to convert MP3 to M4A
- Choose your .mp3 files or drop them on the box above. You can add several.
- M4A is already selected. Leave the bitrate at 192 kbps or change it.
- Conversion starts straight away. Press Download next to each finished file, or Download all.
MP3 vs M4A
| MP3 | M4A | |
|---|---|---|
| Full name | MPEG-1 Audio Layer III | MPEG-4 Audio |
| Type | lossy | lossy |
| Codec | MP3 (LAME encoder) | AAC in an MP4 container |
| Size | 0.96 MB at 128 kbps, 2.4 MB at 320 kbps | about 1.4 MB at 192 kbps |
| Plays on | Everywhere: every phone, browser, car and media player made in the last 25 years | iPhone, Mac, Android, Windows 10+, modern browsers |
MP3. MP3 throws away sound the ear is unlikely to notice, using a psychoacoustic model, so a song shrinks to roughly a tenth of its CD size.
M4A. M4A is an MP4 file with only an audio track, usually AAC. It is what iPhone Voice Memos, Apple Music downloads and many screen recorders produce.
What happens to quality
Going from one lossy format to another re-encodes the audio, which costs a little quality each time. Pick a bitrate at or above the source’s to keep the loss inaudible. What bitrate really means.
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Questions people ask
How do I convert MP3 to M4A without uploading?
Choose or drop your .mp3 file above. AudioKit converts it to M4A inside your browser with ffmpeg.wasm and gives you a download. The file is never sent to a server, and you can convert several at once.
Will I lose quality converting MP3 to M4A?
Going from one lossy format to another re-encodes the audio, which costs a little quality each time. Pick a bitrate at or above the source’s to keep the loss inaudible.
What bitrate should I choose for M4A?
192 kbps is a good default. Going above the source file’s bitrate doesn’t improve sound, it only makes the file larger. For voice recordings, 96–128 kbps is plenty.
Where does MP3 play and where does M4A?
MP3: Everywhere: every phone, browser, car and media player made in the last 25 years. M4A: iPhone, Mac, Android, Windows 10+, modern browsers.
Is this MP3 to M4A converter safe?
It’s about as private as a converter can be: nothing is uploaded, there is no account and no installer. The page needs a modern browser with WebAssembly (any current Chrome, Edge, Firefox or Safari).