Convert MP3 to FLAC online
Convert a MP3 file to FLAC directly in your browser — the file is never uploaded to a server.
or click to select it
Convert an MP3 file to FLAC directly in your browser. Important heads-up: this doesn't restore the quality already lost when the original MP3 was created — it just wraps that same audio in a lossless format from this point forward.
The tool decodes the MP3's audio and saves it as FLAC with no further lossy compression. But the damage from the original MP3 encoding — the frequencies discarded when it was created — is already done and irreversible: the resulting FLAC sounds exactly like the source MP3, just in a different, larger container.
Use cases
- Adapt an MP3 collection for music library software or a hi-fi player set up to organize only FLAC files.
- Meet the format requirement of a device or app that only imports FLAC files, with no expectation of a quality gain.
- Unify a mixed audio collection (MP3 and FLAC) into a single format to make it easier to organize.
How it works
- 1
Upload your MP3 file
Drop the file in or select it from your device.
- 2
Click Convert
ffmpeg.wasm decodes the MP3 and saves it back out as FLAC in your browser.
- 3
Download the FLAC
Once it's done, download the resulting file.
Technical details
Runs ffmpeg.wasm in your browser. No codec can reconstruct information MP3 already threw away during encoding — this process isn't the reverse of lossy compression, it's a lossless recompression of what's left. That's why the result usually ends up bigger than the original MP3 without sounding any better.
Frequently asked questions
Does converting MP3 to FLAC improve the sound quality?
No. FLAC is lossless from the point of conversion onward, but it can't recover data the original MP3 already discarded. The result sounds identical to the source MP3.
So what's the point of this conversion?
Mainly compatibility — some players, car systems or library management software only accept, or only organize well, FLAC files, even though the audio content itself doesn't improve.