How to Convert M4A to MP3 on iPhone
M4A is AAC audio in an MPEG-4 container – the format of iPhone Voice Memos and many downloads. Drop your M4A below to save it as an MP3 – and trim it on the waveform first if you like. It all happens on your iPhone.
Drop an audio file here
MP3, WAV, M4A, OGG, FLAC… · nothing is uploaded
Trimmed on your device. Your audio is never uploaded.
Step by step: Convert M4A to MP3 on iPhone
- 1
Open this page in Safari (or Chrome) on your iPhone or iPad.
- 2
Tap the box above and pick the file in the Files app. Attachments saved from Mail, Messages or Safari are usually in On My iPhone › Downloads.
- 3
The whole file is selected by default. Drag the handles on the waveform only if you want to cut it.
- 4
Choose MP3 as the format (it's already selected), then download. Tap Download. Safari saves the file to Files › Downloads – tap the download arrow in the address bar to open it or share it.
What changes when you convert M4A to MP3
- The MP3 is encoded at 192 kbps – indistinguishable from the original for most listening, at about 1.4 MB per minute.
About M4A and MP3
- M4A is AAC audio in an MPEG-4 container – the format of iPhone Voice Memos and many downloads. Some Windows apps, older MP3 players, car stereos and upload forms won't take it.
- MP3 is the audio format every phone, car stereo, speaker, editor and website accepts. It's lossy, so files are small.
Tips for iPhone
- There's no app to install from the App Store – the tool runs inside Safari, and the file never leaves your iPhone.
- The file is decoded by your browser's built-in audio support. If one browser can't open it, try Chrome or Firefox.
M4A vs MP3
| M4A | MP3 | |
|---|---|---|
| Compression | Lossy (AAC) or lossless (ALAC) | Lossy |
| Best for | Voice memos and Apple devices | Music, ringtones and anything you need to play anywhere |
| Support | Apple devices and most browsers; patchy on older players | Universal |
Frequently asked questions
Does converting M4A to MP3 reduce quality?
Slightly, as MP3 is lossy, but at 192 kbps it's very hard to hear any difference.
Can I cut the audio at the same time?
Yes. Drag the start and end handles on the waveform, preview it, and add a fade in or out if you want.
Is my audio uploaded to a server?
No. The conversion runs in your browser using your device's own processor, so your audio never leaves your device. You can even disconnect from the internet once the page has loaded.
Where does the converted file go on my iPhone?
Tap Download. Safari saves the file to Files › Downloads – tap the download arrow in the address bar to open it or share it.
Need more options? Open the full Audio Trimmer tool →