MP3 to FLAC converter
Convert MP3 to FLAC in your browser. No upload and no account: the file never leaves your device, so the only size limit is your device’s memory.
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Bytes of your files sent anywhere: 0 B · nothing leaves this tab
Every request this page makes is listed as it happens. You’ll see our own code loading, and for some formats a codec engine, but never your file going out.
- Waiting for network activity…
Check it yourself: open your browser’s developer tools on the Network tab, or turn off Wi-Fi once the page has loaded. The tools keep working.
Related conversions
Need it the other way round? Convert FLAC to MP3Convert other formats to FLAC
Read more about the MP3 format and the FLAC format, or see every audio tool and all audio conversions.
Should you convert MP3 to FLAC?
A tool or submission demands FLAC. (It won’t add quality back — it stores the MP3’s decoded audio losslessly.)
Only when software insists on FLAC. It stores the decoded MP3 perfectly, but the detail the MP3 discarded is already gone, so the FLAC is bigger without sounding better.
MP3 is the most compatible lossy audio format ever made; FLAC is lossless audio at roughly half the size of WAV. Use FLAC to archive music and recordings you may want to convert again later.
How to convert MP3 to FLAC
- 01
Add your MP3
Drop your MP3 file onto the box, or click to choose it. It is read from your disk and stays there.
- 02
Check the settings
The output is already set to FLAC. Change the bitrate if you want to; the defaults suit most files.
- 03
Save the FLAC
Press convert and save the FLAC. Several files come back together as a ZIP.
What changes when MP3 becomes FLAC
Bigger, not better
FLAC can’t restore what MP3 compression removed. It does make editing easier and stops further loss, which is why editors and some broadcast systems ask for it.
Expect a much larger file
FLAC is far bigger for the same content. Choose it because something needs FLAC, not to send or store the file. MP3: About 1 MB a minute at 128 kbps, 2.4 MB at 320 kbps. FLAC: About 5–7 MB a minute for music.
This page is put together from our notes on each format, choosing only what is true of MP3 and FLAC, so every pairing states the same facts the same way. How these pages are made.
Why it doesn’t upload
Recordings are often private: interviews, voice notes, unreleased music. Your browser can decode and encode audio itself, so there is no reason to send it anywhere.
How to check for yourselfWorth knowing
- About the MP3. Converting a low-bitrate MP3 to 320 kbps makes it bigger without making it sound any better; what was thrown away is gone.
- About the FLAC. FLAC made from an MP3 is lossless only in name: it perfectly preserves an already lossy recording, at five times the size.
- MP3, WAV, M4A, OGG, Opus and FLAC are converted by your browser directly. WMA, AMR, APE, AC3 and the other specialist formats use the FFmpeg engine, a one-time 31 MB download.
Questions
Does converting MP3 to FLAC lose quality?
No quality is lost converting to FLAC, though it can’t restore what the MP3 already discarded.
Will an FLAC play in my car or on my phone?
FLAC opens almost everywhere: most modern players, Android and recent iPhones; some car stereos and older apps don’t.
Read more about this
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