Convert M4A audio, including iPhone Voice Memos, to MP3 in your browser. Choose the bitrate (128 to 320 kbps) and convert up to 20 files at once.
Works in your browser. What you paste or upload is processed on your device.
Tap the box or drag files onto it. On iPhone, save a Voice Memo to Files first (three dots > Save to Files), then pick it.
Leave 192 kbps for music, or choose 128 kbps for speech. Choose Mono to halve the size of voice recordings.
Press Convert to MP3. Each file is decoded and encoded in your browser, with progress shown for each one.
Play the result to check it, then download the MP3, or all files as one ZIP.
M4A is an audio file in an MP4 container, usually holding AAC audio. iPhone Voice Memos, iTunes purchases, GarageBand exports and many Android recorders save M4A. It sounds good at small sizes, but some car stereos, older MP3 players, podcast hosts, school portals and Windows apps only accept MP3. This converter decodes your M4A files and saves each one as a standard MP3 at the bitrate you choose.
Everything happens in your browser. The tool first asks the browser's own audio decoder (Web Audio) to read the file, which handles AAC in Chrome, Edge, Safari and Firefox. If the browser can't read a file, for example an Apple Lossless (ALAC) M4A in some browsers, it downloads an ffmpeg audio engine (about 30 MB, once) and decodes it with that. The MP3 is then encoded with LAME, the same encoder many desktop apps use, in a background thread so the page stays responsive.
Honest limits: M4A and MP3 are both lossy, so converting one to the other can't add quality. Pick 192 kbps or more for music to keep the loss inaudible; 128 kbps is plenty for speech. Song titles, artist tags and cover art are not copied to the MP3. Songs protected by Apple's DRM (.m4p files and Apple Music downloads) can't be converted.
Voice Memos are the quickest way to record a lecture, an interview or a song idea, but the M4A files they produce get rejected by many upload forms and older players. Converting to MP3 in the browser fixes that in a minute without installing software, and your recordings, which are often private conversations, are never sent to a server.
Something else? Ask the team
In the Voice Memos app, tap the recording, tap the three dots and choose Save to Files. Then open this page in Safari, tap the box, choose Browse and pick the saved M4A file. Press Convert to MP3 and download the result; it is saved to Files > Downloads. On a Mac, you can drag recordings out of the Voice Memos app straight onto the page.
No. The decoding and MP3 encoding run inside your browser on your own device. The only thing sent to our server is a usage count for the daily free run, never the audio.
For speech (voice memos, lectures, interviews), 128 kbps is clear and small; with Mono it is about 1 MB per minute. For music, 192 kbps is a good default and 256 or 320 kbps keeps a little more detail. A higher bitrate than the original M4A doesn't add quality, it only makes the file bigger.
A little, because both formats are lossy and the audio is encoded a second time. At 192 kbps or above most people can't hear a difference from a typical M4A. If you need a lossless copy for editing, convert to WAV instead.
No. Apple Music downloads and older iTunes .m4p files are copy-protected (DRM) and no browser can decode them. Songs you bought DRM-free from the iTunes Store (M4A files) convert normally.
Yes. Add up to 20 files (200 MB each) and press the button once. You can download each MP3 separately or all of them as a ZIP.
No. The MP3 contains the audio only. You can add tags afterwards in a music app such as Music, iTunes or Mp3tag.
You get one free run of this tool per day, and one run converts every file you press the button for (up to 20). After that, each run costs 5 credits (5 US cents) from a free AI Rank Lab account. The free run resets every day.
Each one opens on its own page and works straight away, with no sign-up.
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