MP3 to FLAC — Free & Local Online Converter
Convert MP3 to FLAC online for free — re-encoded with quality-preserving settings. Runs entirely in your browser, files are never uploaded, no watermark and no sign-up. Supports batch conversion; drop multiple files at once.
The MP3 → FLAC converter workspace runs on the main tool page — same local engine, same privacy. English workspace is on the way.
Open MP3 to FLAC converterHow it works
- 1Open the converter and drop your MP3 file — or several at once for batch conversion.
- 2The engine reads your file locally: video and audio are re-encoded into FLAC with quality-preserving settings.
- 3Download the finished FLAC file. Nothing was uploaded at any point.
FAQ
Is the MP3 to FLAC conversion lossless?
The converter re-encodes with quality-preserving settings (CRF ~18–23), so visual quality stays practically identical while the file becomes fully FLAC-compatible.
Do I need to install anything?
No. The converter runs on WebAssembly inside your browser. Nothing to install, no account required.
Are my files uploaded anywhere?
Never. Files are read with the browser File API and processed on your own device. The page even works offline once loaded.
Related converters
ZMQ Tools — https://www.zhuanmaqi.com/en/convert/mp3-to-flac