FLAC to MP3
Nothing is uploaded. The conversion runs here, on this device.
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What this does
FLAC is lossless compression: it makes the file smaller with no change to the audio at all, typically landing at 50–60% of the same recording as WAV. That is why it is what people archive in, and why a FLAC library is still too large for a phone.
FLAC is lossless, so files are large. An MP3 copy is the one that fits on a phone or in an email.
The one conversion where the source really matters
Every other pair on this site starts from audio that has already lost something. FLAC has not. This is a first-generation lossy encode from a bit-perfect source, which is the best-case input an MP3 encoder can get, and it is worth spending bitrate on: 256 or 320 kbps, or VBR, rather than 128. Keep the FLAC. It is the master copy, and having it means any future format — whatever replaces MP3 — can be made from the original rather than from a compressed copy of it.
Nothing is uploaded
The conversion happens inside this page. Your file is read by the browser, converted here, and saved straight back to your downloads. It is never sent to a server, so there is no upload wait and no size cap beyond what your own device can hold.
Open your browser’s developer tools, switch to the network panel, and convert a file. You will see the converter itself download once, and no upload of your audio at all. That is the whole difference between this and a site that converts on a server, and what that difference actually means is worth a read.
The first conversion is slower
The converter is about 32 MB and downloads the first time you use it, which is the one moment this page is not instant. After that it is cached, and later conversions start immediately, even offline. So do later visits.
Questions
Will I hear the difference?
On ordinary equipment, at 256 kbps or above, most listeners do not. On good headphones, with dense music, some do. Since you are keeping the FLAC anyway, there is no reason to be frugal with the bitrate on the copy.
Does it keep the tags?
FLAC stores its metadata as Vorbis comments, and the common fields — title, artist, album — are written into the MP3 where a matching tag exists. Embedded artwork and unusual custom fields may not carry across.
Can I convert a whole album at once?
Yes. Drop the files in together and they are converted one after another, each saved as it finishes. Nothing is uploaded, so a large batch does not queue behind anyone else.