Convert MP3 to FLAC Online Free
Runs 100% in your browser — your files never leave your device.
Drop an MP3 audio and get FLAC back in seconds — output that compresses losslessly for archival. Nothing is uploaded for typical sizes; big files ride our server lane — delete the result right after, or let it auto-delete within an hour. No accounts, no watermarks, free forever.
How it works
- 1
Add your file
Drop it in or click to browse. Typical files convert entirely on your device.
- 2
Convert the audio
Large files finish on our servers instead — delete them right after processing, or let them auto-delete within an hour.
- 3
Download
Save the converted file instantly — free, no watermark, no account.
About this tool
Converting MP3 to FLAC
MP3 is the universal lossy format — every device and player made this century plays it, and its compression discards sound the ear mostly misses. FLAC compresses audio losslessly — typically half the WAV size with every sample bit-identical. It is the archival format of music collectors and audiophiles. Converting lossy MP3 into lossless FLAC preserves exactly what the MP3 contains — it cannot restore what MP3 compression already discarded, but it stops any further loss in future edits.
What to check after converting
Listen to a section you know well — the beginning, the loudest part — and compare it against the original file. The FLAC output is an exact capture of the decoded source. Your original file stays untouched on your device either way.
Frequently asked questions
Will converting MP3 to FLAC reduce the quality?
No further loss — FLAC stores the decoded audio exactly, though what earlier lossy encoding discarded stays discarded.
Is my audio file uploaded anywhere?
Small files convert entirely in your browser; larger ones finish on our servers and auto-delete within an hour. Either way, nothing is kept, shared, or used for anything else.
Why would I pick FLAC over MP3?
Converting lossy MP3 into lossless FLAC preserves exactly what the MP3 contains — it cannot restore what MP3 compression already discarded, but it stops any further loss in future edits.