Why convert MP3 to FLAC?
MP3 is the universal small-file format every device, app and car stereo plays. Converting it to FLAC gives you a lossless, edit-ready file — lossless compression — CD-perfect quality at roughly half the size of WAV.
This converter runs the same FFmpeg engine desktop tools use, compiled to WebAssembly and executed entirely in your browser. Your MP3never touches a server — which is why it's private, works on slow connections, and has no queue. You can also trim, fade, merge and batch-convert in the same step.
Frequently Asked Questions
How do I convert MP3 to FLAC for free?
Drop your MP3 file into the tool above (or click to browse), then hit Export. The output is already set to FLAC. It converts instantly in your browser and downloads — no signup, no watermark.
Is my MP3 file uploaded to a server?
No. The conversion runs entirely in your browser using WebAssembly (FFmpeg). Your MP3 file never leaves your device, which is why it works offline and stays private.
Will converting MP3 to FLAC lose quality?
Converting to FLAC is lossless, so no quality is lost in the container change. Note that if the source MP3 was already lossy, FLAC preserves that quality but can't add back detail the original never had.
Can I trim or fade the audio while converting MP3 to FLAC?
Yes — drag the waveform handles to trim, add fade-in/out, adjust volume or bitrate, then export. You can also drop several MP3 files to batch-convert or merge them into one FLAC file.