Convert M4A to MP3
Turn Apple's AAC files into MP3s that play on anything, from a 2009 car stereo to Audacity or Reaper. The conversion runs in your browser, so your audio never gets uploaded.
Why convert M4A to MP3?
M4A is what you get from an iTunes purchase, an Apple Music download, or an iPhone voice memo, but some Windows apps and older car head units still choke on AAC. MP3 is the one format that opens on every phone, browser, DAW, and dashboard without a fuss. Convert to MP3 when you need to email a rehearsal take to a bandmate on an unknown setup, drop a track onto a USB stick for the car, or hand a client audio that simply has to play. It stays small and easy to share. When universal playback matters more than anything else, MP3 is still the safe pick.
Quality and file size
Both M4A and MP3 are lossy, so this is a transcode: the AAC audio gets decoded and re-encoded as MP3, which adds a small amount of generation loss on top of what the M4A already discarded. To keep that loss inaudible to most ears, choose 320 or 256 kbps. Avoid bouncing the same file back and forth between lossy formats, since every pass shaves off a little more. The MP3 lands close to your M4A in size. Just do not expect it to recover detail the original AAC encode never kept.
M4A to MP3: common questions
Will the MP3 sound worse than my M4A?
There is a small, usually inaudible loss because you are re-encoding already-lossy AAC audio. At 320 kbps most people cannot pick the difference in a blind test. The trade is worth it when you need MP3's universal playback.
Is my file uploaded anywhere?
No. The conversion runs entirely in your browser with FFmpeg compiled to WebAssembly. Your file never leaves your device, and we never see it, store it, or train on it.
What bitrate should I choose?
For music, 320 kbps is the safest choice and 256 kbps is a fine, slightly smaller option. Lower bitrates save space but start to reveal artifacts on cymbals and vocals, so avoid them for anything you care about.
Why not just keep the M4A?
If every device and app you use already plays M4A, there is no reason to convert. Reach for MP3 when a car stereo, an older phone, or a piece of Windows software refuses to open the AAC file.
Who makes this?
We're the small team behind Xport Studio, a private, fully offline app for AI vocals, stems, and mastering. These free tools are side experiments we wanted to share. No upsell, but if you're curious about the bigger thing, take a look.