FLAC to MP3 Converter

FLAC Is Lossless Compression, Not Uncompressed Audio

FLAC stores audio with zero loss while still shrinking it, typically to 50–60% of the size of the equivalent WAV. Decode a FLAC and you get back the original samples exactly, bit for bit — which is why it became the standard for archiving CD collections and for high-resolution music stores.

The catch is playback support. FLAC works in VLC, foobar2000, modern Android, and recent versions of iOS, but plenty of car head units, older iPods, Bluetooth speakers with built-in players, and exercise equipment have never implemented it.

You Are Trading Fidelity for Reach

This conversion is a one-way step down. FLAC holds every sample from the master; MP3 discards what its psychoacoustic model predicts you will not hear. At 320 kbps that difference is extremely hard to detect in a blind test, but it is a real and permanent loss.

The sensible workflow is to keep the FLAC library as your archive and generate MP3 copies for the devices that need them. Never delete the FLAC after converting — you cannot regenerate it from the MP3.

Choosing a Bitrate for a Lossless Source

Because the source is pristine, the encoder has real detail to work with and higher bitrates genuinely pay off here in a way they do not when converting an already-lossy file. 320 kbps is the natural choice for music you care about; 192 kbps is a reasonable compromise when storage on the target device is tight.

Keep the FLAC. Always.

This is worth stating on its own because it is the one mistake that cannot be undone. FLAC is your archive; the MP3 is a copy for a device that cannot play the archive. Deleting the FLAC after converting means the lossless original is gone permanently, and no future conversion can bring it back.

The workflow that works is a FLAC library on a drive or NAS, with MP3 copies generated for the car stereo, the gym player, or the phone with limited storage. When a device is replaced, you generate new copies from the archive rather than converting the copies again.

Why the Same Album Can Be Wildly Different Sizes

FLAC compression varies enormously with the music itself, which surprises people comparing file sizes across an album.

Dense, loud, heavily compressed modern production leaves little redundancy for lossless compression to find, so a FLAC might be 70% of the WAV size. Sparse acoustic recordings with quiet passages compress far better, sometimes to 40%. A track with genuine silence between movements compresses better still.

MP3 behaves differently again: at a fixed bitrate every track of the same length is roughly the same size regardless of content, because the bitrate is what you asked for. That is why the ratio between the FLAC and the MP3 varies so much from track to track even at the same settings.

FAQ