MP3 to FLAC Converter
Convert MP3 to FLAC free — no upload, no signup
To convert MP3 to FLAC, drop your MP3 audio files into the box below and click Convert. Fylo converts with ffmpeg running inside your browser, so nothing is uploaded and there's no signup or watermark. FLAC is lossless, but it can't restore what MP3 compression removed.
Drop audio files here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
FLAC is lossless — no bitrate to choose. Sample rate and channels are under Advanced.
Advanced
How to convert MP3 to FLAC
Add your MP3 files
Drag and drop MP3 files into the box or tap to choose them. The converter engine (about 31 MB) downloads once, the first time you convert.
Check the settings
FLAC is lossless, so there's no bitrate to pick. Change sample rate or switch to mono under Advanced if a device needs it.
Convert and download
Click Convert, then download each FLAC file or all of them as one ZIP.
Why convert MP3 to FLAC?
Some music servers, hi-fi players and archive workflows only accept FLAC.
What happens when you convert MP3 to FLAC?
Fylo decodes the MP3 and stores it losslessly as FLAC — typically 4–5× larger than the MP3.
How does Fylo convert MP3 to FLAC?
Fylo decodes the MP3 audio in the MP3 with ffmpeg compiled to WebAssembly and encodes it with FLAC lossless compression. Nothing is added back: the FLAC is an exact but larger copy of the decoded MP3 (≈ 18–24 MB for a 3-minute song versus ≈ 4.3 MB at 192 kbps). The original sample rate and channel layout are kept unless you change them under Advanced.
What's the difference between MP3 and FLAC?
MP3 (MPEG-1 Audio Layer III) was developed largely at Germany's Fraunhofer Institute and standardised in 1993. It removes sounds the ear is unlikely to notice — a technique called perceptual coding — so a 3-minute song takes about 4 MB at 192 kbps instead of about 32 MB as WAV. The last MP3 patents expired in 2017, so it's now free to use.
FLAC (Free Lossless Audio Codec) was released in 2001 and later maintained by the Xiph.Org Foundation. It compresses PCM audio like a ZIP file compresses data: nothing is thrown away, so a FLAC decodes to exactly the same samples as the source WAV, typically at 50–70% of the size.
Learn more: MP3 format guide · FLAC format guide
| Property | MP3 | FLAC |
|---|---|---|
| Compression | Lossy | Lossless |
| Typical bitrate | 128–320 kbps | ≈ 700–1,100 kbps |
| 3-minute song | ≈ 4.3 MB at 192 kbps | ≈ 18–24 MB |
| Tags and cover art | Yes (ID3) | Yes (with cover art) |
| Compatibility | Universal | Android, Windows 10+, macOS, most players and hi-fi gear |
| Best for | Music and podcasts on any device | Archiving music without quality loss |
| Introduced | 1993 | 2001 |
Frequently asked questions
Does converting MP3 to FLAC improve quality?
No. MP3 is lossy, so detail removed during its compression can't be restored. The FLAC is a lossless copy of what the MP3 sounds like — bigger, but not better.
Should I store MP3s as FLAC?
Only if a system requires FLAC. Otherwise keep the MP3; FLAC just takes more space.
Is my MP3 file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your MP3 file is read directly from your device and never sent anywhere.
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