FLAC to MP3 Converter
Convert lossless FLAC files into portable MP3s.
File
Result
Your converted file will appear here.
About the FLAC to MP3 converter
FLAC is lossless: it compresses without discarding anything, which makes it the right format for archiving a music collection and the wrong one for a device with limited storage or fussy format support.
Because the source is lossless, an MP3 made from it is as good as the bitrate permits — there is no compounded loss from an earlier encode.
Which bitrate for music
This converter defaults to 320 kbps, the MP3 maximum, because people converting FLAC have usually chosen it for quality in the first place.
192 kbps is still excellent and roughly 40% smaller if you are filling a portable player. Below 160 kbps the difference starts to show on anything with cymbals or reverb.
Keep the originals
Convert copies, not your library. FLAC is your master; MP3s are disposable and can be regenerated at any bitrate later. Going the other way is impossible — the discarded detail is gone.
How the conversion works
Your browser decodes the file with the Web Audio API — the same decoder it uses to play media — which hands back raw PCM samples. Those samples are then re-encoded into the output format.
MP3 encoding uses LAME compiled to JavaScript, running in a background worker so a long file does not freeze the page. Nothing is uploaded: no server sees the audio, there is no queue, and there is no processing limit beyond your own device.
Frequently asked questions
Is high-resolution FLAC supported?
Yes. 24-bit and 96 kHz files decode fine. MP3 cannot store rates above 48 kHz, so the audio is resampled down before encoding.
Can I convert MP3 back to FLAC?
You can produce the file, but it would be pointless — losslessly storing already-lossy audio just makes a bigger file with no quality gained.
Is my file uploaded?
No. Decoding and encoding both happen in your browser. The audio never leaves your device, which is why there is no size limit imposed by a server.