M4A to MP3 Converter
Convert M4A to MP3 in your browser, from iPhone voice memos and GarageBand exports to iTunes downloads and .aac files. Drop a batch, keep 192 kbps for music or pick 128 kbps for voice, and download plain MP3s that every player, car and upload form accepts. Your recordings are converted on your own device and never uploaded.
- Runs on your device
- WebCodecs · GPU
- FFmpeg
- Works offline
Updated
Drop your audio files here
How to convert M4A to MP3
Step 1: Drop your M4A or AAC files on the box above. On an iPhone, tap the box and pick the recordings from the Files app.
Step 2: Pick a Bitrate: 128 kbps for voice memos, 192 kbps for music, 256–320 kbps for high-quality AAC downloads.
Step 3: Press Convert. Title, artist and album tags of AAC files are copied into the MP3.
Step 4: Download each MP3, or all of them as a ZIP.
Good to know
Settings explained
- Bitrate
- 128 kbps is fine for speech, 192 kbps for music, 320 kbps is the MP3 maximum.
- OGG codec
- Godot, Unity and older players need Vorbis. Vorbis uses the FFmpeg engine (≈31 MB, downloaded once).
- Opus: Smaller
- Vorbis: Games, older players
Formats
Batch-friendly: add many files and they are processed one after another — if one fails, the rest still finish.
How it runs
- Hardware video engine
- Video is decoded and encoded by your device’s media hardware through WebCodecs — usually several times faster than real time.
- FFmpeg (when needed)
- Older formats and a few filters use FFmpeg compiled to WebAssembly. It downloads once (about 31 MB) the first time it is needed and is cached for offline use.
M4A vs MP3: which is better?
M4A usually sounds better at the same size, because the AAC codec inside it is more efficient than MP3, especially at 128 kbps and below. MP3 wins on compatibility: some car stereos, older MP3 players, Windows apps and web forms still refuse M4A. That compatibility gap is the only good reason to convert.
| M4A | MP3 | |
|---|---|---|
| What it is | MPEG-4 audio container, normally AAC (sometimes Apple Lossless) | MPEG Audio Layer III stream |
| Quality at 128 kbps | Good for music | Usable, slightly duller |
| Made by | iPhone Voice Memos, iTunes, GarageBand, many Android recorders | Almost every audio app and device |
| Plays on | Apple devices, Android, modern browsers | Everything, including old car stereos and MP3 players |
| Can be DRM-protected | Yes, as .m4p or Apple Music downloads | No |
| Related extensions | .m4b (audiobooks), .m4r (iPhone ringtones), .aac (raw AAC) | — |
What is an M4A file?
An M4A file is an MPEG-4 file that contains only audio, almost always compressed with AAC (Advanced Audio Coding). Apple popularised the extension to tell audio-only MP4 files apart from videos, which is why iTunes downloads, GarageBand exports and iPhone voice memos all end in .m4a. The same container can also hold Apple Lossless (ALAC), a lossless codec, which is what Voice Memos writes when its audio quality is set to Lossless.
M4A, M4B and M4R share the container; only the purpose differs. An .aac file is the same AAC audio without the MP4 wrapper.
Which M4A files convert to MP3?
Any M4A your browser can read, which covers almost everything people have on their phones. The exception is copy-protected music, which no honest converter can open.
| File | Inside | Converts to MP3? |
|---|---|---|
| iPhone voice memo (Compressed) | AAC | Yes |
| iPhone voice memo (Lossless) | Apple Lossless (ALAC) | Yes (tags are not carried over) |
| iTunes Store song (iTunes Plus) | AAC, no DRM | Yes, tags kept |
| GarageBand or Logic export | AAC or ALAC | Yes |
| .aac file from a recorder or app | Raw AAC (ADTS) | Yes |
| DRM-free audiobook (.m4b) | AAC with chapters | Yes, as one MP3; chapter marks are not kept |
| Apple Music download or old .m4p purchase | FairPlay-protected AAC | No, the audio is encrypted |
Does converting M4A to MP3 lose quality?
A little, because you decode one lossy format and encode another. Choose an MP3 bitrate at or above the M4A’s and the extra loss is very hard to hear: 256 kbps AAC from iTunes converts well at 256 or 320 kbps, music at 128–192 kbps converts well at 192 kbps. Going higher than that only makes the file bigger.
Voice memos are a special case. They are speech, so 128 kbps MP3 is already generous, and 64 kbps is fine if you need small files for email or a transcription service. Lossless voice memos keep full quality until the MP3 step, so pick 192 kbps for those if you care about every detail.
How to convert an iPhone voice memo to MP3
You do not need GarageBand, a computer or an app. Everything happens in Safari on the iPhone.
- In Voice Memos, tap the recording, tap •••, then Share and Save to Files.
- Open this page in Safari and tap the drop zone, then Choose Files, and pick the memo from the folder you saved it to.
- Set Bitrate to 128 kbps and press Convert.
- Tap the download button. The MP3 is saved to the Downloads folder in the Files app, ready to attach to an email or a web form.
Convert M4A to MP3 on Windows, Mac or Android
The converter is a web page, so the steps are the same in Chrome, Edge, Firefox and Safari. Only the file picker looks different.
Windows 10 and 11
Drag M4A files from File Explorer onto the drop zone. Windows can play M4A but has no built-in way to convert a folder of them to MP3.
Mac
Drag files from Finder into Safari or Chrome. The Music app can also create MP3 versions of songs in your library once you set its import encoder to MP3.
Android
Many voice recorder apps save M4A. In Chrome, tap the drop zone, pick the recordings and the MP3s land in Downloads.
Tips & troubleshooting
Want the words, not just the audio? Audio to text transcribes M4A voice memos on your device, no conversion needed.
WhatsApp or Telegram voice note instead? Those are Opus files; use Opus to MP3.
Need WAV for Audacity, a DAW or a transcription service? Convert with M4A to WAV instead and skip a lossy step.
Long lecture recording? Cut out the part you need with the MP3 cutter after converting, or before: it reads M4A too.
Recorded too quietly? Bring it up with the volume booster, which has a limiter so the loud parts do not crackle.
M4A to MP3 Converter FAQ
Is M4A the same as MP3?
No. Both are compressed audio, but M4A is an MPEG-4 container that usually holds AAC, while MP3 is its own older format. AAC sounds a little better at the same bitrate; MP3 plays on more old devices and in more apps.
Does converting M4A to MP3 lose quality?
Slightly, since both formats are lossy and the audio is re-encoded. At an MP3 bitrate equal to or higher than the M4A’s, the difference is very hard to hear. Converting never improves quality, so there is no point choosing 320 kbps for a 64 kbps voice memo.
Can I convert M4A to MP3 on iPhone without an app?
Yes. Save the recording to the Files app, open this page in Safari, tap the drop zone, pick the file and press Convert. The MP3 is saved to Downloads in Files. Nothing is installed and nothing is uploaded.
Why won’t a song from Apple Music convert?
Apple Music downloads and old iTunes .m4p purchases are protected with FairPlay DRM, which encrypts the audio. No browser can decode it, so the file fails with a “couldn’t read the audio” message. DRM-free iTunes Store purchases convert normally.
Can I convert lossless voice memos?
Yes. Voice memos recorded with the Lossless setting are Apple Lossless (ALAC) inside an M4A file, and they convert like any other memo. Pick 192 kbps if you want the MP3 to keep as much of that quality as possible.
Is it safe to convert voice memos here?
Yes. The memo is decoded and re-encoded inside your browser, so it never reaches a server. That matters for interviews, meetings and personal notes, which upload-based converters would otherwise receive a copy of.