Convert MP3 to FLAC
Convert MP3 files to FLAC for tools and libraries that require lossless input — without pretending it restores quality.
This conversion runs in this browser tab. The selected file is not uploaded for processing.
MP3 to FLAC, step by step.
These steps describe the MP3 input and the FLAC export for this exact route.
Upload MP3 Files
Drag and drop your MP3 files or click to browse. You can queue several at once.
Convert in Your Browser
The first run fetches the conversion engine (a one-time ~31MB download); after that, MP3 to FLAC conversion happens entirely on your device — nothing is uploaded.
Download FLAC
Save the converted file right away. Multiple files are bundled into a ZIP for one-click download.
What to expect
What matters for FLAC output.
Review the behavior this MP3 to FLAC tool is designed to preserve, expose, or simplify.
100% Private
All processing happens in your browser. Your files never leave your device.
Lossless Compression
FLAC shrinks audio to roughly half of WAV size while staying bit-perfect — decode it and you get the original samples back exactly.
One-Time Engine Download
The first conversion fetches a ~31MB audio engine; your browser caches it, and everything runs locally from then on.
Questions about MP3 and FLAC.
Check the format behavior, limitations, and follow-up options before processing a real file.
Converting MP3 to FLAC does not improve the audio — the detail MP3 encoding discarded is gone for good, and no format change reverses it. What it does is satisfy tools and workflows that insist on FLAC input: music servers, DJ software, archival systems, or a collection you're standardizing on one format. The resulting FLAC losslessly preserves the MP3's decoded audio, so at least nothing further degrades.
Related routes
Continue from FLAC.
Choose another format only when it matches the next job.
Next step
Ready to process another MP3 file?
Start here again, or compare plans when the job needs server capacity, retention, or repeat automation.