Are my MP3 files uploaded anywhere?

No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and convert something. You will see the page load, plus the analytics and advertising the site is paid for with — and nothing carrying your file.

Is converting MP3 to FLAC free?

Yes. There is no account, no watermark and no limit on how many files you convert — it runs on your own machine, so it costs us nothing to let you. Files up to 100 MB are handled in the browser.

Does converting MP3 to FLAC lose quality?

No. FLAC stores the same content without discarding anything, so the result is identical in quality to the original. The file gets much larger without getting better. What the original compression removed is gone; a lossless format can only preserve what is left.

Do I need to install anything to open FLAC files?

No installation is needed for the conversion itself — it runs in the browser you already have. Opening the FLAC afterwards needs whatever software normally handles Free Lossless Audio Codec on your device.

MP3toFLAC

Convert MP3 to FLAC

Up to 100 files at once. Mixed formats are fine.

You can convert MP3 to FLAC free and without an account: drop the file above and the FLAC is ready to download in a second or two. The conversion happens inside your own browser, so the file is never uploaded — it works on Windows, Mac, Linux, iPhone and Android, and keeps working with the network switched off.

What MP3 and FLAC are for

The audio format everything plays. Lossy, small, thirty years old and still unbeaten on compatibility.

Lossless compression at about half the size of WAV. The archival choice for music.

How to convert MP3 to FLAC

Drop your MP3 file onto this page, or click to pick one.
Choose FLAC as the target. The conversion runs inside your browser — the file is never uploaded.
Download the finished FLAC file.

MP3 vs FLAC: what changes

MP3 compared with FLAC
	MP3	FLAC
Full name	MPEG Audio Layer III	Free Lossless Audio Codec
File extension	.mp3	.flac
Media type	audio/mpeg	audio/flac
Compression	Lossy — file size is bought with quality	Lossless — nothing is discarded

Quality: Nothing is lost. The result holds exactly the same picture, text or data as the original.
Where it runs: This conversion runs inside your browser. Your file is never uploaded, and it works with the network disconnected.
What can be lost: The file gets much larger without getting better. What the original compression removed is gone; a lossless format can only preserve what is left.

MP3 to FLAC: common questions

Are my MP3 files uploaded anywhere?: No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and convert something. You will see the page load, plus the analytics and advertising the site is paid for with — and nothing carrying your file.
Is converting MP3 to FLAC free?: Yes. There is no account, no watermark and no limit on how many files you convert — it runs on your own machine, so it costs us nothing to let you. Files up to 100 MB are handled in the browser.
Does converting MP3 to FLAC lose quality?: No. FLAC stores the same content without discarding anything, so the result is identical in quality to the original. The file gets much larger without getting better. What the original compression removed is gone; a lossless format can only preserve what is left.
Do I need to install anything to open FLAC files?: No installation is needed for the conversion itself — it runs in the browser you already have. Opening the FLAC afterwards needs whatever software normally handles Free Lossless Audio Codec on your device.