Convert AAC to FLAC Online Free
Runs 100% in your browser — your files never leave your device.
Drop an AAC AAC 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 AAC to FLAC
AAC is the modern lossy successor to MP3 — better quality at the same size, and the standard audio codec of streaming platforms and mobile devices. FLAC compresses audio losslessly — typically half the WAV size with every sample bit-identical. It is the archival format of music collectors and audiophiles. FLAC preserves exactly what the AAC decoding produces — no further loss, though nothing the AAC discarded comes back either.
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 AAC 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 AAC?
FLAC preserves exactly what the AAC decoding produces — no further loss, though nothing the AAC discarded comes back either.