Convert MP3 to M4A
M4A wraps AAC audio, which is what Apple devices and most video editors expect to be handed.
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
A generation. AAC is the better codec, but re-encoding an MP3 through it still costs a little.
What you do not gain
Compatibility with Apple software and video timelines. The audio is not improved by the better codec — it can only preserve what the MP3 already had.
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
Bringing audio into Final Cut, iMovie or an iOS app that will not take an MP3.
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