FLAC files: lossless compression that actually is
How FLAC halves a WAV without losing a sample, why it is the right archive format, and when MP3 is still the answer. Convert FLAC in your browser, no upload.
At a glance
- Type
- Audio
- Compression
- Lossless
- Extensions
- .flac
- MIME type
- audio/flac
- Common codecs
- flac
- Also known as
- Free Lossless Audio Codec
FLAC does to audio what ZIP does to a document: it finds redundancy and removes it, and the original comes back exactly. Encoding a WAV to FLAC typically lands at 50–60% of the size, and decoding it returns every sample bit-for-bit. There is no quality setting because there is no quality decision — the compression level only changes how hard the encoder works and how small the result is.
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That makes it the correct format for an archive. A music library, a set of live recordings, a folder of masters: FLAC halves the storage and loses nothing, and unlike WAV it stores checksums, so you can verify years later that a file has not silently corrupted. The standard workflow is to keep FLAC and encode to MP3 or AAC only for the device you are about to listen on.
It is also the ideal source for a lossy encode. Because FLAC has never been through a psychoacoustic model, an MP3 made from it is a first-generation encode — the encoder works from the complete signal rather than from something already reduced. Converting an M4A or a video soundtrack to MP3 is a second generation and always costs more.
Support is now broad: most editors and players read FLAC, and both Windows and Android have for years. The gaps are iOS, which handles it inconsistently, car stereos, and older hardware players — which is exactly why the FLAC-to-MP3 conversion exists.
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FAQ
Is FLAC really lossless?
Yes, literally. Decoding a FLAC returns exactly the samples that were encoded. It compresses by removing redundancy rather than by discarding detail, the same way ZIP does with a document.
How much smaller is FLAC than WAV?
Typically 50–60% of the size, depending on the material. Quiet or sparse recordings compress more; dense loud mixes compress less.
Is there a quality setting?
No. The compression level affects only how hard the encoder works and how small the file is — the decoded audio is identical either way.
Why convert FLAC to MP3 at all?
For devices that cannot read FLAC: car stereos, older portable players, some phones. It is a compatibility conversion, and since FLAC is lossless the resulting MP3 is a first-generation encode, which is the best case.
Should I archive in FLAC or WAV?
FLAC. Same audio, roughly half the size, and it stores checksums so you can verify integrity later — something WAV cannot do.
Does converting an MP3 to FLAC improve it?
No. FLAC will preserve exactly what the MP3 decodes to, which is compressed-quality audio stored losslessly. Lossless means nothing further is lost, not that anything is restored.
Does it handle 24-bit and high sample rates?
Yes, FLAC stores them natively. Converting such a file to MP3 resamples anything above 48 kHz and discards the extra bit depth, because MP3 cannot carry them.
Will my phone play FLAC?
Android does, and has for years. iOS support is inconsistent, and most car stereos and older players never implemented it — which is what the FLAC to MP3 conversion is for.