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AAC to MP3

Free online audio converter

Convert M4A to MP3 in your browser

This free converter turns .m4a files — iTunes tracks, Apple Music downloads, iPhone Voice Memos, GarageBand exports — into MP3 at 128, 192, 256 or 320 kbps. It needs no signup and no software install, converts up to 20 files per batch at 100 MB each, and runs entirely inside your browser, so your audio is never uploaded to a server.

  • 100% free
  • No upload
  • No signup
  • Up to 320 kbps
  • Batch of 20
  • Works offline

Drop your M4A files here to convert them to MP3

.aac, .m4a, .m4b, .m4r and audio-only .mp4 — up to 20 files, 100 MB each

How to convert M4A to MP3

Three steps, no account, no upload. Files are decoded and re-encoded on your own device.

  1. Add your M4A files

    Drag .m4a files onto the drop zone, or press Choose M4A files to pick them from your device — iTunes tracks, Voice Memos exports and GarageBand bounces all work. You can queue up to 20 files at a time, 100 MB each.

  2. Set the MP3 bitrate

    Pick a bitrate between 128 and 320 kbps. 192 kbps is the default and a good match for a typical 256 kbps M4A music file; use 128 kbps for voice memos and recordings where size matters more than fidelity.

  3. Convert and download

    Conversion starts as soon as a file lands in the queue and shows a live percentage. Press Download MP3 on any finished track, or Download all to save the whole batch — filenames are kept, only the extension changes.

M4A to MP3 — frequently asked questions

How do I convert M4A to MP3?

Drop your .m4a file onto the box at the top of this page, choose a bitrate (128, 192, 256 or 320 kbps), and press Download MP3 when the progress bar finishes. There is nothing to install and nothing is uploaded — the conversion runs inside this browser tab on your own device.

What is an M4A file, and why won't my device play it?

M4A is AAC audio packed in an MP4 container — the default format for iTunes purchases, Apple Music downloads, iPhone Voice Memos and GarageBand exports. It sounds great, but many car stereos, MP3 players, DJ decks and older devices only read MP3, which is why converting is often the quickest fix.

Is this M4A to MP3 converter really free?

Yes, completely. No signup, no email, no daily file limit, no watermark, and every bitrate up to 320 kbps is available to everyone.

Are my M4A files uploaded anywhere?

No. Your browser decodes the M4A natively and re-encodes it to MP3 with a LAME encoder running in a Web Worker on your device. Voice memos and private recordings never leave your computer — the conversion even works with the network disconnected.

Can I convert iPhone Voice Memos to MP3?

Yes. Voice Memos saves recordings as .m4a, so share the memo to your computer (AirDrop, iCloud or email), drop it here, and pick 128 kbps — plenty for speech, and it keeps the MP3 small.

Does converting M4A to MP3 lose quality?

Slightly, because both formats are lossy and the audio gets compressed a second time. At 256 or 320 kbps the difference is inaudible for almost everyone; 192 kbps holds up well for music on normal headphones. Keep the original M4A if the recording is irreplaceable.

Why won't my iTunes M4A convert?

If the file is actually an .m4p — the DRM-protected format iTunes used before 2009 — no browser can decode it, and this tool will show an error. Regular .m4a purchases and Apple Music downloads without DRM convert normally.

Can I convert several M4A files at once?

Yes. Drop up to 20 files in one batch and they convert one after another, each with its own progress bar and download button. Download all saves every finished MP3 in one click.

Why M4A files need converting at all

M4A is the file extension Apple uses for AAC audio in an MP4 container. Everything the Apple ecosystem produces — an iTunes purchase, an Apple Music download, a Voice Memo, a GarageBand bounce — lands on your disk as .m4a. It is a perfectly good format, and at the same bitrate it actually sounds better than MP3.

The problem is everything outside that ecosystem. Car head units, USB-stick MP3 players, DJ and karaoke software, gym equipment, older Android phones and a long tail of embedded devices read MP3 and nothing else. Converting the file is almost always faster than fighting the device, and because M4A is just AAC in a wrapper, this site converts it exactly the same way it converts a raw .aac file.

One caveat: both M4A and MP3 are lossy, so a conversion is a second pass of compression. Pick 256 or 320 kbps if the source was a high-quality music file, and keep the original M4A as your master copy. For voice memos and interviews, 128 kbps is transparent for speech and keeps files small. The full pipeline — Web Audio decoding plus a LAME encoder in a Web Worker — is described on the about page.

Your recordings never leave this tab

M4A files are often personal — voice memos, lecture recordings, interview tapes. There is no upload step and no conversion server here: decoding and MP3 encoding both happen in your browser, so we never receive your audio, its filename or its metadata. Close the tab and it is gone from memory.