The short answer
iPhone and Mac Voice Memos are saved as M4A files. Export the memo from the Voice Memos app, drop the M4A into the converter below with MP3 as the output format, pick 128 kbit/s and tick Mono, then press Download. A ten minute memo becomes an MP3 of roughly 5 MB that plays in car stereos, Windows apps, old MP3 players and upload forms that only accept MP3.
Several memos can go in at once. Each one is converted in turn and you can save them one by one or with Download all as ZIP.
Try it here: M4A to MP3
Open the full tool pageM4A vs MP3: why convert at all
M4A is an MP4 container holding AAC audio. AAC is newer than MP3 and sounds a little better at the same size, which is why Apple uses it for Voice Memos, GarageBand exports and music. Modern phones, Macs and current Windows versions play M4A without trouble.
MP3 wins on compatibility. Older car radios, USB players, some answering machines and phone systems, podcast and school upload forms, and plenty of older software accept MP3 only. If you send a memo to someone and do not know what they will play it on, MP3 is the safe choice.
Converting from M4A to MP3 re encodes compressed audio, so in theory a little detail is lost. For speech at the settings below the difference is not audible.
| Feature | M4A (AAC) | MP3 |
|---|---|---|
| Default on | iPhone, iPad, Mac | Almost every device since the 1990s |
| Quality at the same size | Slightly better | Good |
| Plays in older car stereos and players | Often not | Yes |
| Accepted by upload forms | Sometimes | Nearly always |
How to get the memo off your iPhone, Mac or Android
You need the recording as a file before you can convert it. The steps differ slightly by device and system version, but the idea is the same everywhere.
- iPhone or iPad: open Voice Memos, tap the recording, tap the More button (three dots), then Share and Save to Files. Open this page in Safari, tap the drop area and choose the file from Files. You can also share the memo to yourself by email or AirDrop it to a computer.
- Mac: open Voice Memos and drag the recording to the desktop or a Finder folder. The result is an M4A file you can drop straight onto the converter.
- iCloud: if Voice Memos syncs with iCloud, the same recordings appear in Voice Memos on your Mac, which is often the quickest way to get many memos onto a computer.
- Android: many recorder apps also save M4A, others save MP3, OGG or WAV already. Use the app's Share option to save the file, or find it in the Files app, usually in a Recordings or Music folder.
- Windows: copy the M4A from email, iCloud for Windows or a USB cable, then drop it on the page.
Which bit rate to choose for speech and music
The converter offers 96, 128, 192 and 256 kbit/s. A higher number means more data per second, a larger file and more detail. Speech needs far less than music: a voice has a narrower range of frequencies, and most voice memos are recorded with one microphone anyway.
Mono matters as much as the bit rate. With Mono ticked, the converter writes one channel and halves the bit rate, so 128 kbit/s stereo quality becomes a 64 kbit/s mono file with the same quality per channel and half the size. For a recording made on a phone microphone you will not hear a difference.
| Use | Setting | Size per minute (approx.) |
|---|---|---|
| Voice memos, lectures, meetings | 128 kbit/s, Mono | 0.5 MB |
| Interviews and podcasts to publish | 192 kbit/s, Mono | 0.7 MB |
| Smallest file for long recordings | 96 kbit/s, Mono | 0.5 MB |
| Music recorded in stereo | 192 kbit/s, stereo | 1.4 MB |
| Music you want to keep | 256 kbit/s, stereo | 1.9 MB |
Common problems and fixes
- The memo will not open: make sure you saved the file itself, not a link to it. A file shared from Voice Memos ends in .m4a. If you get the message that the file type or codec is not supported, try a current version of Chrome, Edge or Safari.
- Lossless recordings: Voice Memos has an audio quality setting with a lossless option. Those files still end in .m4a but contain Apple Lossless audio, which some browsers cannot read. If one fails, try Safari, or switch the setting back to compressed for future recordings.
- The MP3 is larger than the M4A: you probably chose a higher bit rate than the original. Pick 128 kbit/s with Mono for speech.
- Quiet or noisy recording: converting does not change volume or remove noise. It keeps the sound as it is.
- Protected music: songs bought long ago from iTunes with copy protection cannot be converted. Normal M4A files and voice memos work.
Tips for recordings you plan to share
Trim long silences at the start and end in Voice Memos before exporting (Edit Recording, then the trim tool). It is faster than editing the MP3 later.
Name the file before you convert it. The MP3 keeps the name of the original with a new extension, so a clear name such as 2026-03-14 team meeting saves confusion later.
If the recording will be transcribed, many transcription services accept MP3 and M4A alike. If one asks for WAV, choose WAV as the output format instead; it is larger but uncompressed.