Does converting MP3 to FLAC improve quality?

No. The FLAC holds exactly the MP3's sound — just bigger. Only a FLAC made from the original source is truly lossless.

Why would I convert MP3 to FLAC, then?

When software or a library expects FLAC, or before editing, so later saves don't lose more.

Is it free and private?

Yes — the file is converted in your browser, not uploaded.

MP3 to FLAC Converter

Convert MP3 files to FLAC in your browser — nothing is uploaded.

MP3, WAV, FLAC, M4A, M4B, MP4, AAC, OGA or WEBA, one or many. Drop them here or paste with ⌘V / Ctrl+V. Choose what each becomes on its row.

Runs on your device. Files are read and converted in your browser and aren't uploaded.

MP3

Lossy
Plays everywhere
Small files

The audio format almost everything plays. MP3 makes small files by leaving out detail most ears won't miss, which makes it the safe choice for music, podcasts and voice notes you want to share, upload or keep on a phone.

MP3 Converter — convert MP3 files to any format

FLAC

Lossless
Compressed
Music archives

Lossless audio in about half the space of a WAV. FLAC keeps every sample but packs it tightly, which makes it the favourite for music collections and archives. Most players and Android phones play it; Apple Music and iTunes don't.

FLAC Converter — convert FLAC files to any format

Learn more about converting MP3 to FLAC

When you'd do this

A library, player or system you use wants everything in FLAC — or you're putting an MP3 among FLACs and want one format. (If you're hoping for better sound, read on.)

What to expect

A 4-minute MP3 at 192 kbps is about 5.5 MB; the FLAC can come to about 30 MB. Several times bigger, with exactly the MP3's sound.

Recommended settings

16-bit (the default). An MP3 has nothing a 24-bit FLAC would keep.

Where it plays

Android, Windows, VLC and most music players; on iPhone in Files and VLC.

Good to know

It doesn't make the MP3 lossless or better: what the MP3 removed stays removed. The FLAC only stops further loss.
An MP3 can be up to 100 MB and 30 minutes long.

How to do it

Choose your MP3 files, or drop them on the page — as many as you like.
Each is set to FLAC. Change one on its own row if you like, and the bit depth and the channels in Settings.
Convert all, then download each FLAC, or all of them in one .zip.

Questions

Does converting MP3 to FLAC improve quality?: No. The FLAC holds exactly the MP3's sound — just bigger. Only a FLAC made from the original source is truly lossless.
Why would I convert MP3 to FLAC, then?: When software or a library expects FLAC, or before editing, so later saves don't lose more.
Is it free and private?: Yes — the file is converted in your browser, not uploaded.