How to Convert M4A to MP3 — and Whether You Should
Convert M4A to MP3 for car stereos, old players and upload forms. What M4A is, the bitrate to pick, keeping tags and cover art, and when not to.
Updated October 14, 20265 min read
To convert M4A to MP3, open the file in an M4A-to-MP3 converter, choose a bitrate — 192 kbps is a good default for music, 128 kbps is plenty for speech — and download the MP3. The song title, artist and album are carried over automatically. Converting makes sense when something refuses M4A: an older car stereo, a cheap MP3 player, a website upload form, or an editing app. It does not make the audio sound better; M4A is usually the more efficient format. This guide explains what M4A is, which bitrate to choose, and how to avoid losing quality you do not need to lose.
What is an M4A file?
M4A is an MPEG-4 file that contains only audio. The name is mostly an Apple convention: it is the same container as an MP4 video, with the video track left out. iPhone Voice Memos records M4A, iTunes and Apple Music purchases use it, and many Android recorders and messaging apps save audio this way too.
Inside, an M4A almost always holds AAC audio, which is lossy like MP3. Less often it holds ALAC (Apple Lossless), which keeps every sample exactly. You cannot tell which from the file name; ALAC files are usually several times larger for the same length — roughly 5 MB or more per minute of stereo music, compared with about 1–2 MB per minute for typical AAC.
| M4A (AAC) | MP3 | |
|---|---|---|
| Compression | Lossy, more efficient | Lossy, older design |
| Quality at the same bitrate | Generally better, especially below 160 kbps | Good at 192 kbps and above |
| Plays on | Phones, computers, most modern devices | Practically everything with a speaker |
| Typical use | Apple devices, Voice Memos, streaming | Older players, car stereos, upload forms |
When you should convert — and when not
Convert to MP3 when a device or service refuses M4A. Common cases:
- Car stereos and USB sticks. Many head units read MP3 from a USB drive and nothing else.
- Older MP3 players and some smart speakers.
- Upload forms for podcasts, schools, auditions and some voicemail or phone systems that list MP3 only.
- Software that handles MP3 more reliably, such as some older audio editors and presentation tools.
Do not convert if everything you use already plays M4A. Converting AAC to MP3 is lossy-to-lossy: the MP3 encoder works from audio that was already compressed once, so the result can only be slightly worse, and at the same bitrate it is often larger than it needs to be. Keep the original M4A either way.
Step by step
Add the M4A
Drop the file into the M4A to MP3 converter. It is decoded on your device; nothing is uploaded.
Choose a bitrate
192 kbps for music, 128 kbps for speech. See the table below.
Leave sample rate and channels as they are
Keep original is the right choice unless a form asks for something specific. Switch to mono for a voice recording to halve the size.
Check the track details
Title, artist, album and other tags are carried over, and cover art is kept where the format allows it.
Convert and download
Save the MP3 and keep your original M4A.
Pick a bitrate, keep the track details, download the MP3. It all runs on your device, not our servers.
Convert M4A to MP3Which bitrate to choose
| Content | Bitrate | Size per minute (approx.) |
|---|---|---|
| Voice memo, lecture, phone call | 64–96 kbps (mono) | 0.5–0.7 MB |
| Podcast or audiobook | 128 kbps | about 1 MB |
| Music, everyday listening | 192 kbps | about 1.4 MB |
| Music from a high-quality source | 256–320 kbps | 1.9–2.4 MB |
Size per minute is simply bitrate × 60 ÷ 8: 192 kbps × 60 seconds = 11,520 kilobits, or about 1.4 MB. A higher bitrate than the source cannot add quality back. Converting a 128 kbps AAC voice memo to a 320 kbps MP3 gives you a file two and a half times bigger that sounds the same. As a rule, match the source or go one step higher to cover the extra encoding round; going far above it only wastes space.
The free plan exports MP3 at up to 192 kbps, which is transparent for music on almost any playback system. Pro unlocks 256 and 320 kbps and higher sample rates. If your M4A is Apple Lossless and you want to keep every sample, convert to FLAC instead — it is lossless and widely supported — or to WAV for editing.
Keeping song titles and cover art
M4A and MP3 store track details in different ways — iTunes-style atoms in M4A, ID3 tags in MP3 — and a careless conversion leaves you with a folder of tracks called "Unknown Artist". The converter reads the title, artist, album, album artist, genre, track number, year and comment from the M4A and writes them into the MP3, and keeps the cover art where the output allows it. Editing those fields during conversion is a Pro feature; to fix them afterwards on any plan, use the audio tag editor.
Converting iPhone Voice Memos
Voice Memos saves recordings as M4A. To get one off the phone, open the memo, tap the share icon and choose Save to Files, then open the M4A to MP3 converter in Safari and pick the file from Files. For a recording of speech, choose mono and 64–96 kbps: the MP3 will be small enough to email, and the voice will sound exactly as it did. If you want the words rather than the audio, transcribing audio to text takes the M4A directly, without converting.
The free converter handles one file at a time, up to 50 MB and 10 minutes long — enough for a song or a short memo. Longer recordings, such as a full lecture, need Pro, which also converts batches and downloads them as one ZIP. Alternatively, cut the recording into parts first. For a custom iPhone ringtone, M4A is actually the format you want — see making a ringtone. The broader picture of when to use which format is in audio formats explained.
Frequently asked questions
How do I convert M4A to MP3 for free?
Open the M4A to MP3 converter, add the file, choose 192 kbps for music or 128 kbps for speech, and download. One file at a time is free, up to 50 MB and 10 minutes.
Is M4A better quality than MP3?
Usually, at the same bitrate. AAC audio in an M4A is more efficient than MP3, especially below 160 kbps. MP3's advantage is that it plays on almost everything.
Does converting M4A to MP3 lose quality?
A little, because one lossy format is re-encoded into another. At 192 kbps or higher most listeners cannot hear the difference. Keep the original M4A.
What bitrate should I use for M4A to MP3?
192 kbps for music and 128 kbps for podcasts. For voice recordings, 64–96 kbps in mono is plenty. Going higher than the source does not improve the sound.
Will the song title and artist be kept?
Yes. Title, artist, album and the other track details are carried over into the MP3's tags, and cover art is kept where the format allows it.
How do I convert a voice memo to MP3 on iPhone?
Share the memo to Files, then open the M4A to MP3 converter in Safari and choose the file. Pick mono and 64–96 kbps for a small, clear MP3.