Free tool

Free audio file converter

Convert voice memos and audio files between MP3, M4A, WAV, OGG, FLAC, and WebM. Everything runs in your browser — no upload, no sign-up, and your files never leave your device.

🔒 Your files stay private. All conversion happens in your browser. Nothing is uploaded to any server.

How it works

  1. 1. Choose your audio file. Pick or drag in almost any audio file — an iPhone voice memo (m4a), an mp3, a wav recording, and more.
  2. 2. Pick the target format. MP3 for maximum compatibility, WAV or FLAC for lossless editing, M4A, OGG, or WebM for the web.
  3. 3. Convert and download. The conversion runs on your own device using FFmpeg compiled to WebAssembly, then the file downloads instantly.

Done converting? Now make your voice notes searchable.

Chronicle automatically transcribes and organizes all your voice notes — then lets you ask questions about anything you’ve ever recorded. No more exporting, converting, and scrubbing through audio to find that one thing you said.

Download on the App StoreGet it on Google Play

Frequently asked questions

What audio formats are supported?
You can convert to MP3, M4A (AAC), WAV, OGG (Vorbis), FLAC, and WebM (Opus). Almost any audio file works as input — including m4a and mp4 (Apple Voice Memos), mp3, wav, ogg, opus, flac, webm, aac, wma, amr, and aiff.
Is my audio uploaded to a server?
No. Conversion happens entirely in your browser using WebAssembly. Your files never leave your device — nothing is uploaded, stored, or seen by anyone.
Is there a file size limit?
We recommend files under 100 MB for best performance. Because conversion runs on your own device, very large files depend on your browser and available memory.
Is it really free?
Yes, completely free with no limits, no watermarks, and no account. Conversion runs on your device, so it costs us nothing to offer — we make Chronicle, an app that transcribes and organizes voice notes, and this tool is how many people discover it.
How do I convert an iPhone Voice Memo (m4a) to mp3?
In the Voice Memos app, tap the recording, tap the share icon, and save the .m4a file. Choose it above, select MP3, and press Convert — the mp3 downloads straight to your device.

Need the words, not the file? Try the free voice memo transcription tool.