Convert M4A to MP3
M4A is what an iPhone voice memo and most Apple audio come out as. MP3 is what everything else expects.
Audio only · up to 10 files · 100 MB each — those numbers protect your memory, not our server
Getting the converter ready — this happens once, then your browser keeps it.
The converter could not start.
The engine files are missing from — copy ffmpeg-core.js and ffmpeg-core.wasm there.
Almost always a mismatched build: the worker is an ES module, so the core has to be the esm one too. Copy ffmpeg-core.js and .wasm from @ffmpeg/core/dist/esm/, not dist/umd/.
not in this build of the converter, so it is not offered.
What you lose
Both are lossy, so this is a second compression on top of a first — the technical term is a generation loss. In practice, at 192 kbps or above, almost nobody hears it on speech and most people hear nothing on music. It is still a real loss, and doing it repeatedly does accumulate.
What you do not gain
No quality is recovered. If the M4A was a 64 kbps voice memo, the MP3 will sound exactly as thin — larger file, same audio.
What it does to the size
Approximate, for stereo audio at the settings this tool uses by default. The real figure moves with the material — silence and speech compress far better than a full mix.
When this is the right conversion
Something refuses to open an M4A: older car stereos, some editing software, a few upload forms. If whatever you are using already opens M4A, converting only costs you a little quality.
Other conversions
This tool is free because dbelo is a library of sound effects, and we would rather you found us this way than not at all.
Browse the sound library