AnyFormat

00 FLAC → MP3

FLAC to MP3

First lossy generation, straight from the lossless master.

Drop files or a folder here

or choose from your device · paste with ⌘V / Ctrl+V

.flac

03Options 5

Right for speech, wrong for music. At a fixed quality the file size does not change — but mono tolerates a much lower quality than stereo, so combine the two to actually shrink the file.

Leave at 0 for the whole file.

0 means run to the end.

  • No upload The conversion runs in this tab. Your file never travels — not to us, and not to the advertising.
  • No sign-up, no email, no daily cap There is no account system to sign up to.
  • No size limit we invented Only your device's memory — about ~2 GB on a desktop browser, ~400 MB on a phone.
  • Turn your Wi-Fi off and convert anyway The conversion needs nothing but this page. Ads will not load without a connection; your file will still convert. That is the whole claim, and it takes five seconds to check.

Converts FLAC to MP3. This is the best possible case for an MP3: the source is lossless, so the encoder works from the full signal and the result is a single, clean generation.

Keep the FLAC

The FLAC is your master. It is bit-for-bit identical to the CD or the download it came from, and you can produce any number of MP3s from it at any bitrate later. You cannot go the other way.

Treat the MP3 as a copy for the car, the phone or the gym — not as a replacement.

Expect about a fifth the size

FLAC compresses losslessly to roughly half of WAV. High-quality MP3 is roughly a tenth of WAV. So a 30 MB FLAC track typically becomes a 6–8 MB MP3.

At High quality, the difference from the FLAC is inaudible to almost everyone on almost all equipment. This is the encode where that claim is actually true, because there is no earlier generation of loss underneath it.

How MP3 encoding works without a server

Browsers decode MP3 but do not encode it — there is no MP3 encoder in WebCodecs. The encoding here is LAME, the reference open-source MP3 encoder, compiled to WebAssembly and loaded only when you actually convert to MP3.

It is the same encoder desktop software has used for twenty years, producing standard files that play everywhere. Because it is fetched on demand, pages that convert to WAV or M4A never download it.

Tags and album art

FLAC stores metadata as Vorbis comments and can embed cover art. Those do not carry into the MP3, which uses ID3. If you are converting a library, run it through a tagging tool afterwards, or use a media manager that handles both.

Other names for this

Also searched as “convert flac to mp3”, “flac to mp3 320”.

Questions

Will I hear the difference?
At High quality, almost certainly not — and this is the case where that is genuinely true, because the source is lossless and there is only one generation of loss.
How much smaller?
Roughly a fifth. A 30 MB FLAC track becomes about 6–8 MB.
Do the tags and cover art transfer?
No. FLAC uses Vorbis comments and MP3 uses ID3. Re-tag afterwards with a media manager.
Is my file uploaded?
No. The demuxing, decoding and encoding all happen in this tab using the browser’s own media stack plus a WebAssembly encoder. A recording can be an interview, a lecture, a private call — none of it is transmitted. Turn your Wi-Fi off after the page loads and it still works.
How large a file can I convert?
There is no imposed limit, only your device’s memory — around 2 GB in a desktop browser and 400 MB on a phone, since the file is held in memory while it converts. A two-hour video converts in well under a minute on a laptop.
Can I convert several files at once?
Yes. Drop as many as you like, or a whole folder. Each keeps its original name with the new extension, and you can download them individually or as a ZIP.