MP3 → FLAC
Convert MP3 to FLAC
Free, instant and 100% private. Your MP3 file is converted on your own device and never uploaded anywhere.
Drop your MP3 file here
or click to choose — converted to FLAC instantly, on your device
Nothing is uploaded. Your files never leave this browser.
Converting MP3 to FLAC is a common task when you need lossless quality. MP3 is the most widely supported compressed audio format on earth. It shrinks audio dramatically with quality good enough for nearly all listening, and plays on essentially every device and app. FLAC, on the other hand, gives you lossless quality and smaller than wav. ZeroUpload performs this conversion entirely inside your browser, so your MP3 file is never uploaded to a server.
How to convert MP3 to FLAC
- 1
Drop your MP3 file into the box (or click to select it).
- 2
ZeroUpload converts it to FLAC instantly, right inside your browser.
- 3
Download your new FLAC file. Nothing was ever uploaded.
When should you convert MP3 to FLAC?
You should convert MP3 to FLAC when you want lossless music archiving but your source is MP3. Typical situations include music for any phone, car or player, podcasts and voice recordings, where the destination expects FLAC instead.
MP3 vs FLAC
MPEG-1 Audio Layer III (MP3)
MP3 is the most widely supported compressed audio format on earth. It shrinks audio dramatically with quality good enough for nearly all listening, and plays on essentially every device and app.
Strengths
- + Plays everywhere
- + Small files
- + Great general-purpose format
Trade-offs
- – Lossy compression
- – No multichannel surround
Free Lossless Audio Codec (FLAC)
FLAC (Free Lossless Audio Codec) compresses audio with zero quality loss — typically to about half the size of WAV. It is the audiophile favourite for archiving and high-fidelity listening, at the cost of larger files than lossy formats.
Strengths
- + Lossless quality
- + Smaller than WAV
- + Free and open
Trade-offs
- – Larger than MP3/AAC
- – Not supported by every device
Frequently asked questions
How do I convert MP3 to FLAC? +
Drop your MP3 file into the box above (or click to choose it), and ZeroUpload converts it to FLAC right inside your browser. Then download the result. No account, no waiting.
Is it safe to convert MP3 files here? +
Completely. ZeroUpload does the entire conversion on your own device. Your MP3 file is never uploaded to any server, so your data stays 100% private.
Does converting MP3 to FLAC cost anything? +
No. It is free with no limits and no signup. Because the conversion runs on your device, there are no server costs and therefore no paywalls.
What is the difference between MP3 and FLAC? +
MP3 is the universal compressed audio format that plays on virtually any device. FLAC is a lossless compressed format beloved by audiophiles. Converting from MP3 to FLAC trades plays everywhere for lossless quality.
Will it work offline? +
Yes. Once the page (and engine) has loaded, the MP3 to FLAC conversion works even with your internet disconnected, because everything happens locally.