How-to
How to Convert Voice Memos and Voice Notes to MP3
Recordings from phones and messaging apps come in a confusing mix of formats: M4A, Opus, OGG, AMR and more. Here's what each one is, why some won't open on other devices, and how to turn them into universally playable MP3s.
Why voice recordings won't always play
Every phone and app chooses the format that suits it best: small files for messaging, good quality for memos. The receiving device or website might not understand that format. A Windows PC may not play an iPhone memo with its default app, an upload form might only accept MP3, and a voice note saved from a chat app might show up as an unknown file. Converting to MP3 solves nearly all of these problems.
Which format is your recording in?
| Source | Typical file | Codec | Converts in the browser? |
|---|---|---|---|
| iPhone Voice Memos | .m4a | AAC (or ALAC if lossless is enabled) | Yes |
| Android recorder apps | .m4a, sometimes .3gp or .amr | AAC; AMR on older devices | M4A yes; AMR usually not |
| WhatsApp voice notes | .opus | Opus | Yes, in most modern browsers |
| Telegram voice messages | .ogg | Opus | Yes, in most modern browsers |
| Screen and video recordings | .mp4, .mov, .webm | AAC or Opus soundtrack | Yes (audio is extracted) |
About AMR: the AMR speech codec, used by some older Android phones, isn't supported by most web browsers. If an .amr file won't open, re-record with a newer app, or convert it with desktop software first.
Getting the file off your phone
- iPhone Voice Memos: open the memo, tap the "…" or share button, and choose Save to Files or send it to your computer.
- Android: open your recorder app and use Share, or find the file in the Recordings or Music folder with a file manager.
- WhatsApp: forward the voice note to yourself and save or share it from there. On Android, voice notes are stored as .opus files in WhatsApp's media folder.
- Telegram: use the message menu to save the file to your downloads.
Converting to MP3
- Open the MP3 Converter on your phone or computer.
- Add one or more recordings; mixed formats are fine.
- For speech, choose Mono and a bitrate of 96 kbps or 128 kbps (the converter's lowest settings already give clear speech).
- Convert and download, individually or as a ZIP.
Need the file even smaller, for example to email a long interview? The Audio Compressor goes down to 32 kbps mono at 22 kHz, which is still perfectly intelligible for speech.
Make it sound better while you're at it
- Trim the fumbling: remove the first seconds of pocket noise and the "stop" tap at the end with the Audio Trimmer.
- Fix a quiet recording: phones held at arm's length record quietly. Normalize with the Volume Booster, keeping the limiter on.
- Name files clearly: date first, such as
2026-10-08 interview Sarah.mp3, so they sort in order.
Privacy matters for voice recordings
Voice memos often contain personal conversations, interviews and private notes. Because Full Audio Tools converts files inside your browser, the recordings never leave your device. That's worth checking with any converter you use.
Frequently asked questions
How do I convert an iPhone voice memo to MP3?
Save the memo to Files or your computer, open it in the MP3 Converter, choose mono for speech, and convert. The .m4a file becomes an .mp3.
Can I convert a WhatsApp voice note to MP3?
Yes. Save or forward the .opus file, then convert it. Most modern browsers can decode Opus.
What bitrate is best for voice recordings?
For speech, 64–96 kbps mono MP3 sounds clear. Go down to 32 kbps if file size matters more than quality.
Try it yourself
MP3 Converter
Turn M4A, FLAC, OGG, WAV or video soundtracks into universally playable MP3s.
Open toolAudio Trimmer
Remove dead air at the start and end, automatically or to the exact second.
Open toolVolume Booster
Raise the level of quiet recordings safely, or turn loud ones down.
Open toolAudio Compressor
Make audio files smaller for email, messaging apps and upload limits.
Open tool