Convert MP3 to FLAC
FLAC is lossless compression: it stores audio exactly, at about half the size of WAV.
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
Nothing — FLAC is lossless and will store what it is handed without altering a bit of it. But that is not the point worth making on this page.
What you do not gain
NOTHING. This conversion cannot improve the audio and a great many people believe it can. FLAC stores perfectly whatever it is given, and what it is being given here is already-compressed audio with parts permanently removed. You end up with a file three or four times larger that sounds identical to the MP3. If you want a lossless copy of something, you have to go back to a lossless source — there is no other way, and no converter anywhere can do it.
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
Almost never, honestly. The one real case is a library or a piece of software that only accepts lossless formats and refuses MP3 outright.
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