FLAC to MP3 Converter

FLAC keeps CD and hi-res audio without any loss, but a single album can take 300–600 MB. MP3 at 256–320 kbps is a fraction of that and still sounds the same to most listeners, which suits phones, cars and older players. This converter handles a whole album at once and carries the tags and cover art across, entirely inside your browser.

How to use this tool

1. Select the FLAC files (a whole album is fine).
2. Pick the MP3 quality: 320 kbps is the MP3 maximum, 256 kbps is very close, 192 kbps saves more space.
3. Keep "Keep tags and cover art" on so players show the album correctly.
4. Press Calculate and download the MP3s, or all of them as a ZIP.

Formula

MP3 size ≈ bitrate (kbps) × 1000 ÷ 8 × length (s)

FLAC decodes natively in all current browsers; the audio is encoded with LAME. Vorbis comments (TITLE, ARTIST, ALBUM, ALBUMARTIST, TRACKNUMBER/TRACKTOTAL, DATE, GENRE) and the PICTURE block are written as an ID3v2.3 tag. 24-bit and 88.2–192 kHz files are converted to MP3's maximum of 48 kHz. Tracks longer than 5 minutes use the faster ffmpeg engine (about 30 MB, downloaded once).

Example

A 45-minute album as FLAC is typically around 300 MB. At 320 kbps the MP3s take 320,000 ÷ 8 × 2,700 = 108,000,000 bytes ≈ 103 MB; at 192 kbps about 62 MB.