tools / m4a-to-mp3
m4a-to-mp3/
Convert M4A to MP3 — AAC, WAV, FLAC, OGG and more also work. Convert several files at once, or output WAV instead. Your audio is never uploaded; everything runs in your browser.
File
| File | Length | Result |
|---|
How to convert M4A to MP3
- Choose the output format and bitrate: 192 kbps is fine for everyday listening, 320 kbps for better quality, and WAV if you want the uncompressed waveform.
- Choose or drop audio files. You can pick several; they're converted one after another.
- When done, click “Download” on each row, or “Download all”.
Notes
- Which formats work depends on your browser: Chrome, Edge, Safari and Firefox can decode M4A (AAC), MP3, WAV and FLAC; OGG / Opus needs a recent browser. Lossless ALAC (Apple Lossless) can't be decoded by some browsers.
- Output is always 44.1 kHz. Mono stays mono; multichannel audio (5.1 etc.) keeps only the left and right channels.
- MP3 is lossy: converting M4A to MP3 can't improve quality, and a higher bitrate than the original only makes the file bigger.
- Tags such as title, artist and cover art are not copied to the new file.
- Audio is processed only in your browser and never uploaded. Each file can be up to 200 MB; recordings longer than an hour may run out of memory on phones.
- MP3 encoding uses LAME ’s JavaScript port, lamejs (LGPL licensed).
FAQ
It says “your browser can't decode this format” — what now?
Try another browser such as Chrome or Safari. Lossless ALAC M4A files usually convert in Safari.
Why is there a tiny bit of silence at the start of the MP3?
MP3 encoding and decoding add a small delay and padding at the start and end — a few tens of milliseconds in total. It's inherent to the MP3 format and inaudible in normal listening; choose WAV if you need sample-accurate editing.