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How to Convert FLAC to MP3
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When Do You Need to Convert FLAC to MP3?
FLAC is the right format for storing music and the wrong one for carrying it around: the files are large and plenty of phones, car systems and portable players will not read them. Converting FLAC to MP3 trades exactness for size and compatibility.
What Happens When You Convert FLAC to MP3
ffmpeg decodes the lossless FLAC and encodes MP3. This is the first lossy step for audio that was until now an exact copy, so the encoder is choosing what to discard rather than working from something already degraded. That makes it the best possible starting point for an MP3, and at higher bitrates the result is very close to the source. Expect the file to shrink to roughly a fifth to a tenth of the FLAC.
Worth knowing before you convert
This is a one way step in quality terms. Converting the MP3 back to FLAC later produces a large file that still sounds like the MP3.
About FLAC and MP3
audio/flac
FLAC compresses audio data without any loss of quality, reducing file size by roughly 40–60%. It preserves perfect audio fidelity while remaining smaller than WAV or AIFF. FLAC is popular among audiophiles and archival institutions.
audio/mpeg
MP3 is the most widely used audio compression format for music distribution. It reduces file size by removing frequencies less audible to the human ear. MP3 files are supported by virtually all audio players and devices, making them ideal for music sharing and streaming.
Conversion Notes
Audio conversion from FLAC to MP3 re-encodes at the highest quality setting appropriate for the target format. Lossless-to-lossy conversion (e.g., FLAC to MP3) is a one-way process — converting back to lossless does not recover the discarded information. Metadata tags (title, artist, album, track number) are mapped to the closest equivalent fields in the target format.
Frequently Asked Questions
Some, since MP3 is lossy. Starting from FLAC gives the encoder a perfect source, so the result is as good as MP3 gets.