Convert MP3 to FLAC
Convert MP3 to FLAC right in your browser — free, private, nothing is uploaded. Get a lossless file any editor opens — no further quality loss.
Convert MP3 to FLAC →Free · Private — runs in your browser, nothing is uploaded
MP3 is the most widely supported audio format there is — a lossy codec that shrinks audio to a fraction of its uncompressed size and plays on virtually anything with a speaker.
FLAC compresses audio without losing anything — a perfect, bit-for-bit copy at a fraction of the WAV size, which makes it the default choice for archiving music.
Converting MP3 to FLAC is about compatibility rather than quality: some editors, DAWs and pipelines simply insist on FLAC. You get a file they open natively — but the audio can never get better than the MP3 you start from.
MP3 vs FLAC
| MP3 | FLAC | |
|---|---|---|
| Compression | lossy — some detail traded for size | lossless — nothing discarded |
| Codec / container | MPEG Layer III audio | Free Lossless Audio Codec |
| Typical file size | small — about 1.4 MB per minute at 192 kbps | medium — typically 50–70% of the equivalent WAV |
| Best for | sharing, podcasts and everyday listening | archiving and lossless music libraries |
| Strength | plays everywhere; small files | lossless and compressed — a perfect copy, smaller than WAV |
| Watch out for | lossy — encoding discards some audio detail to save space | much larger than lossy formats; some older hardware skips it |
| Compatibility | universal — effectively every device and app | wide in modern software; patchy on older hardware players |
How the conversion works
- Choose your MP3 file (up to 10 MiB). The button above opens the converter with FLAC already selected as the target format.
- There is no bitrate to choose: FLAC is lossless, so the bitrate field is simply ignored.
- Run the conversion and download the result — the output keeps your filename with a .flac extension. Everything happens locally: the page runs ffmpeg compiled to WebAssembly, so your audio is never uploaded to a server.
What to expect
No quality is restored. FLAC preserves exactly what's in your MP3 file — detail the MP3 encoder already discarded is gone for good. Expect a much larger file with identical sound; convert because a tool needs FLAC, not to upgrade the audio.
Embedded album art is dropped along the way: cover images ride along as a video stream, which audio-only outputs like FLAC can't carry.
FAQ
Does converting MP3 to FLAC improve the audio quality?
No. FLAC preserves exactly what's in the source — detail the MP3 encoder already discarded is gone for good. Convert because a tool needs FLAC, not to upgrade the sound.
Why is the FLAC file so much larger than my MP3?
MP3 stores heavily compressed audio; FLAC stores a losslessly-compressed copy of the decoded audio — so the same sound takes several times the space. That's normal, and the extra bytes don't add quality.
Is my MP3 file uploaded when converting to FLAC?
No. The page downloads an ffmpeg WebAssembly build once, then converts your file locally in the browser tab — the audio never leaves your device. Input files up to 10 MiB are supported.