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MP3 to FLAC Converter

Convert MP3 files to lossless FLAC format. Create high-quality archives of your audio collection with FLAC\'s lossless compression and metadata support.

Free to use, no watermarks, runs in your browser—nothing uploads to our servers

Source file

Files are processed locally in your browser using WebAssembly.

Saved FFmpeg presets (stored locally)

Saved presets

Preset name

Compression Level

Sample Rate (Hz)

Channels

Preserve Metadata

Jump to helper sections

Why convert MP3 to FLAC?

Converting to FLAC creates a lossless archive of your audio. While it won't restore lost quality from MP3, it prevents further degradation and is ideal for long-term storage.

What compression level should I use?

Levels 0-8 are available. 5 is the default and provides good compression. 8 gives the smallest files but takes longer to encode. 0 encodes fastest but creates larger files.

Will converting MP3 to FLAC improve quality?

No. FLAC cannot restore quality lost during MP3 compression. The FLAC file will have the same audio quality as the MP3 source but in a lossless container.

Report a bug

If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.