Convert M4A and AAC files to MP3 at up to 320 kbps. Batch convert multiple files and download as ZIP.
Free, runs in your browser.
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Explore channelsAn M4A to MP3 converter takes an M4A or AAC audio file and re-encodes it as MP3, the most widely supported audio format around. This tool runs entirely in your browser using the Web Audio API and a local MP3 encoder. Your files never upload to a server - decoding and encoding both happen on your device.
It accepts .m4a and .aac files and converts them to MP3 at 128, 192, 256 or 320 kbps.
M4A is Apple's default format for Music purchases, GarageBand exports, and iPhone Voice Memos - but plenty of apps, editors and devices only play MP3. Here is how to convert:
Voice Memos on iPhone saves recordings as M4A by default. If you need to send a memo to someone on Android, edit it in a tool that only reads MP3, or attach it somewhere that rejects M4A, converting solves it in a few seconds. Drop the file in, convert, and you have an MP3 that plays anywhere.
AAC is the audio codec. M4A is the container file that usually wraps AAC audio - so most of the time "M4A" and "AAC" refer to the same underlying data, just packaged differently. Raw .aac files without the M4A wrapper are less common but play in fewer places than you would expect. This tool accepts both and treats them the same way.
MP3 is an older, lossy format, but it remains the safest choice for compatibility - every player, DAW, car stereo, and messaging app handles MP3 without question.
M4A is already lossy, so converting to MP3 is a lossy-to-lossy conversion - some additional audio data is discarded during the MP3 encode. At 320 kbps, the highest bitrate MP3 supports, that extra loss is close to inaudible for most listeners on regular playback gear. If you need the absolute best fidelity, keep the original M4A and only convert copies you plan to share or play elsewhere.
The bitrate controls how much audio data the MP3 keeps per second. A practical breakdown:
Voice recordings compress well even at 128 kbps since speech has less detail than music. For music, stick with 320 kbps.
Drop in a whole folder of M4A or AAC files, set the bitrate once, and convert them all in parallel. When they finish, download the entire batch as a single ZIP instead of clicking save on each one.
SoundCloud accepts and recommends lossless uploads - it re-compresses everything for streaming, so starting from the best source you have gives the best result. If your only copy is an M4A voice memo or export, convert it to MP3 for sharing demos and DMs, but upload the original if it is your best available quality.
Looking to get your track on a SoundCloud channel? Premierely connects artists with channels for premieres and reposts.
Find channels on PremierelyDrop your M4A files onto the upload area, pick a bitrate (320 kbps for best quality), then hit convert. Download files individually or grab the whole batch as a ZIP.
M4A (AAC) is already a lossy format, so converting to MP3 is a lossy-to-lossy conversion - there is some quality loss either way. At 320 kbps the difference is close to inaudible for most listeners.
Yes. iPhone Voice Memos save as M4A by default. Drop the .m4a file in, convert, and you get an MP3 that plays on any device or app that does not support M4A.
No. Conversion happens entirely in your browser using the Web Audio API and a local MP3 encoder. Your files never leave your device.
AAC is the audio codec. M4A is a container file that usually holds AAC audio. This tool accepts both .m4a and raw .aac files and converts either one to MP3.
Yes. Add as many files as you want, convert them all in parallel, then download everything as a single ZIP.
Yes. M4A and AAC decode natively in Safari, so this tool works on iPhone and Mac without any issues.
100 MB per file. There is no limit on the number of files you can convert.
Need WAV instead? Our M4A to WAV converter gives you uncompressed output. The full audio converter handles WAV, MP3, FLAC, OGG, AAC and Opus in one place. Converting from FLAC or OGG instead? Try the FLAC to MP3 converter or OGG to MP3 converter. Already have an MP3 that is too big? Use the MP3 compressor. Cut and trim with the MP3 cutter, or add smooth fades with the audio fade tool. Working from WAV? Use the WAV to MP3 converter. Every tool runs free in your browser with no upload.