Convert MP3 to FLAC

Transform your the universal audio format into FLAC format. Free, private, and browser-based.

How it works

  1. Upload MP3 Files — Drag and drop your MP3 files into the converter, or click to browse. Common sources: music downloads, podcast apps.
  2. Convert to FLAC — The converter processes your files to FLAC format entirely in your browser. No files are uploaded to any server — your privacy is guaranteed.
  3. Download Results — Download your converted FLAC files instantly. For multiple files, download individually or as a ZIP archive.

Why convert MP3 to FLAC

  • Convert to lossless FLAC format to prevent further quality degradation during editing
  • Leverage FLAC advantages: lossless quality — bit-for-bit identical to original
  • Overcome MP3 limitations: lossy compression — some quality loss
  • Upload to websites and platforms that require or prefer FLAC format

FAQ

Is MP3 to FLAC conversion free?
Yes, Fileza.io converts MP3 to FLAC completely free with no limits on file size or number of conversions. No hidden fees, no watermarks, and no account required.

Will I lose quality converting MP3 to FLAC?
No quality is lost. FLAC uses lossless compression, preserving all original data from your MP3 file.

Is it safe to convert MP3 to FLAC online?
Absolutely. Unlike most online converters, Fileza.io processes your files entirely in your browser using WebAssembly. Your MP3 files are never uploaded to any server — the conversion runs on your own device, keeping your files 100% private.

Can I convert multiple MP3 files to FLAC at once?
Yes, Fileza.io supports batch conversion. Drag and drop multiple MP3 files at once and they will all be converted to FLAC simultaneously. Download them individually or as a ZIP archive.

Does MP3 to FLAC conversion work on mobile?
Yes, the converter works on any device with a modern web browser — iPhones, iPads, Android phones, and tablets. No app installation required.

Will the converted FLAC files be smaller or larger than MP3?
File sizes depend on content and quality settings. MP3 files are typically small (1 mb per minute at 128 kbps), while FLAC files are medium (50-70% of wav).

How long does MP3 to FLAC conversion take?
Most conversions complete in seconds. The exact time depends on file size and your device performance. Since processing happens locally in your browser, faster devices convert more quickly. Longer audio files may take a few extra seconds.