MP3 to FLAC Converter
Going MP3 to FLAC won't bring back what MP3 encoding threw away. The audio you hear in the FLAC will sound identical to the source MP3. What you get is a lossless container, so the next time the file gets re-encoded for any reason, you don't compound MP3 loss with another generation of compression.
How it works
Drop the MP3
Any MP3, any bitrate. The decoder doesn't care.
Up to 200 MB
Encode at FLAC level 8
FLAC compression levels 0-8 trade speed for size; level 8 squeezes the most. Decoded audio is bit-identical regardless of level. Only the file size differs.
Encoder: ffmpeg flac · level 8 · ~50-60% of WAV size
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The FLAC will be smaller than the equivalent WAV but bit-identical to the decoded MP3 audio. Tags carry over from the MP3.
Standard .flac, Vorbis comments preserved
Archive, don't compound
Stop stacking compression every time you re-save
Every time an MP3 gets re-encoded, for a new device, a different app, an edit, it loses a little more. Moving it into FLAC freezes the audio in a lossless container, so no future conversion adds a second generation of damage on top of the first. It's how you keep a file usable for years without it slowly degrading.
For audiophile libraries
The format hi-res players and apps actually want
Plenty of music players and streaming apps, the ones built for careful listeners, prefer or require FLAC. If you're consolidating a collection into one of those, converting your MP3s to FLAC gets them into the library cleanly, sitting alongside your genuine lossless files in the same format.
No false promises
FLAC won't turn a 320 kbps MP3 into hi-res
Wrapping an MP3 in FLAC doesn't make it high-resolution, the audio is still exactly what the MP3 held, just losslessly stored. Real hi-res FLAC has to come from a 24-bit master, not a converted MP3. We'd rather tell you that up front than sell you a bigger file pretending to be something it isn't.
Frequently asked questions
Why convert MP3 to FLAC if it doesn't improve quality?
Two reasons. One: archiving. Keep the audio in a lossless container so re-encoding it for a different format doesn't add another generation of MP3 artifacts. Two: importing into music libraries that prefer FLAC, like audiophile players or hi-res streaming apps.
How much smaller will the FLAC be vs a WAV of the same audio?
Typically 40-60% smaller. FLAC compresses by finding patterns in PCM data. Music with quiet sections compresses more; loud, full-spectrum material compresses less. Compression is reversible. Decoding the FLAC gives you bit-identical PCM back.
Will the FLAC pass for high-resolution audio?
Only if the source was high-res to begin with. A FLAC encoded from a 320 kbps MP3 is still 320 kbps quality in lossless wrapping. Hi-res FLAC means a 24-bit / 96 kHz or higher PCM source. That has to come from the master, not from converting an MP3.
Goes well with this tool
FLAC to MP3
Encode FLAC down to portable MP3.
WAV to FLAC
Compress a WAV master losslessly.
MP3 to WAV
Move MP3 audio into uncompressed WAV.
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