Quick answer: To convert M4A to MP3, add the file, choose a bitrate (192 kbps is a good default), click Convert and download the MP3. The conversion runs in your browser, so your file is never uploaded. Files up to 50 MB are supported.
How to use the M4A to MP3 Converter
- Add your M4A file (up to 50 MB).
- Select a bitrate: 64, 128, 192 or 320 kbps.
- Click Convert and download the MP3 when it is ready.
About M4A to MP3 conversion
M4A is an audio-only file in the MPEG-4 container. Most M4A files hold AAC audio, the lossy format Apple uses for iPhone Voice Memos, GarageBand exports and many downloads, but the same extension is also used for Apple Lossless (ALAC). MP3 is older but plays almost everywhere: car stereos, basic MP3 players, smart TVs, web forms and apps that reject M4A. Converting re-encodes the audio into the MP3 format, so the result is a new file and your original M4A is left untouched.
Which bitrate should I choose?
| Bitrate | Best for | Approx. size per minute |
|---|---|---|
| 64 kbps | Voice notes, lectures, spoken word | 0.5 MB |
| 128 kbps | Podcasts and everyday listening | 1.0 MB |
| 192 kbps | Music with good quality (default) | 1.4 MB |
| 320 kbps | Highest MP3 quality | 2.4 MB |
AAC is usually more efficient than MP3, so an M4A file sounds comparable to an MP3 only at a somewhat higher bitrate. If the sound matters, use 192 kbps or 320 kbps. For voice memos and interviews, 64 or 128 kbps keeps the file small and speech stays clear. A higher bitrate cannot restore detail that is not in the original recording, so choosing 320 kbps for a quiet phone recording only makes the file bigger.
What to expect from the result
- Audio only. Tags such as title, artist and cover art are not copied into the MP3.
- A small quality change. Going from one lossy format to another always loses a little. At 192 kbps or higher it is hard to hear for most people.
- Protected files will not convert. Older store purchases with copy protection cannot be read, and FormatVolt does not remove DRM.
- Lossless M4A (ALAC) converts fine, but if you want a perfect copy, keep the original or use a lossless format instead of MP3.
Converting iPhone Voice Memos
Voice Memos are saved as M4A. Share the recording to your Files app or send it to your computer, then add it here and pick 64 or 128 kbps for a compact MP3 that is easy to email or upload. If you only need part of the recording, trim it first with the MP3 Cutter, which also accepts M4A.
Limits
Each file can be up to 50 MB. Very long recordings can be slow on older phones, so use a desktop browser if the conversion stalls.
Private by design
The conversion runs inside your browser. Your audio file is not uploaded to FormatVolt or any other server. The first time you convert, your browser downloads the converter engine (about 30 MB). It is then stored in your browser cache, so later conversions start faster. Conversion speed depends on your device and the length of the file. Keep the tab open until the conversion finishes.
Frequently asked questions
How do I convert M4A to MP3?
Add your M4A file, choose a bitrate, click Convert, then download the MP3.
Does the converter keep the title, artist and cover art?
No. The MP3 contains the audio only, so tags and cover art are not copied.
Will converting M4A to MP3 reduce quality?
Slightly, because both formats are lossy and the audio is re-encoded. At 192 kbps or higher the difference is difficult to hear for most people.
Can I convert an iPhone voice memo?
Yes. Voice Memos are saved as M4A. Move the recording to your device, add it here and convert it to MP3.
Is there a file size limit?
Yes. Each file can be up to 50 MB.
Why does the first conversion take longer?
Your browser downloads the converter engine (about 30 MB) once. After that it is cached and later conversions start faster.
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Last updated: November 10, 2026