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format

FLAC

FLAC compresses audio losslessly to around half the size of WAV.

Also known as Free Lossless Audio Codec.

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What is a FLAC file?

An open lossless audio codec that reconstructs the original samples exactly while roughly halving file size.

Technical characteristics

Representation
binary
Compression
Linear prediction, Rice coding
Lossy
No
Open specification
Yes

History and origin

Introduced
2001
Organisation
Xiph.Org Foundation

Compatibility

  • Windowsfull
  • macOSfull
  • Linuxfull
  • Androidfull
  • iOSfull

Browsers: Chrome, Firefox, Safari, Edge.

Advantages of FLAC

  • Lossless at about half the size of WAV
  • Rich tagging
  • Royalty-free

Limitations to know about

  • Still much larger than lossy formats
  • Not supported by some car head units

When to use FLAC

  • Music archiving
  • Hi-fi listening
  • CD ripping

Convert FLAC files

FLAC is the right archive master; export MP3 or AAC copies for portable use.

FLAC scores

Deterministic scores calculated from the structured facts above. Identical facts always produce identical scores.

Overall score

74/100

  • Openness score

    100
    • the specification is published openly
    • an openly specified format can be implemented without a licence negotiation

    Confidence 62% · evidence coverage 100%

  • Archiving score

    97
    • the specification is public, so a decoder can always be rebuilt
    • the specification is published openly
    • it is actively maintained and current
    • an openly specified format can be implemented without a licence negotiation

    Confidence 77% · evidence coverage 89%

  • Longevity score

    92
    • it is actively maintained and current
    • the specification is published openly
    • the specification is public, so a decoder can always be rebuilt
    • it sits at the centre of the format ecosystem, with many documented relationships

    Confidence 76% · evidence coverage 100%

  • Compatibility score

    80
    • every major browser engine renders it natively
    • Windows, macOS, Linux, Android and iOS all open it without extra software
    • an open specification means cloud SDKs can implement it without licensing friction
    • it opens by double-clicking on every mainstream device
    • only a narrow set of applications handles it

    Confidence 80% · evidence coverage 100%

  • AI score

    72
    • open specifications are implemented by the open-source decoders that ML stacks rely on
    • the specification is published openly
    • only a narrow set of applications handles it
    • large lossless payloads cost bandwidth and memory

    Confidence 59% · evidence coverage 100%

  • Web score

    67
    • every major browser engine renders it natively
    • browsers render it natively, so no conversion step is needed at request time
    • the specification is published openly
    • it stores data losslessly, so files stay large
    • large lossless payloads cost bandwidth and memory

    Confidence 76% · evidence coverage 92%

  • Printing score

    62
    • lossless data means no compression artefacts appear at print resolution
    • only a narrow set of applications handles it

    Confidence 63% · evidence coverage 50%

  • Photography score

    56
    • lossless data survives repeated open-edit-save cycles without degrading
    • it opens by double-clicking on every mainstream device
    • it stores data losslessly, so files stay large

    Confidence 65% · evidence coverage 44%

  • Editing score

    51
    • lossless data survives repeated open-edit-save cycles without degrading
    • only a narrow set of applications handles it

    Confidence 54% · evidence coverage 63%

  • Streaming score

    49
    • every major browser engine renders it natively
    • it stores data losslessly, so files stay large
    • large lossless payloads cost bandwidth and memory

    Confidence 79% · evidence coverage 100%

  • Performance score

    35
    • it stores data losslessly, so files stay large
    • large lossless payloads cost bandwidth and memory

    Confidence 71% · evidence coverage 100%

What FLAC is recommended for

Every conclusion below is derived from the structured facts on this page — nothing is written by hand.

  • Browser compatibility100/100

    • Because every major browser engine renders it natively.
    • Because at least one shipping browser renders it.

  • Operating system compatibility100/100

    • Because Windows, macOS, Linux, Android and iOS all open it without extra software.
    • Because most platforms handle it natively.

  • Cloud compatibility100/100

    • Because an open specification means cloud SDKs can implement it without licensing friction.
    • Because it converts into many other formats, which suits automated pipelines.

  • Long-term archiving100/100

    • Because the specification is public, so a decoder can always be rebuilt.
    • Because lossless storage preserves the original data for future migrations.
    • Because it is a current, actively maintained format.

  • Open standards100/100

    • Because the specification is published openly.

  • Licensing100/100

    • Because an openly specified format can be implemented without a licence negotiation.
    • Because the core patents are old enough to have expired.

  • Future-proofing88/100

    • Because it is actively maintained and current.
    • Because open specifications outlive the companies that create them.
    • Because nothing in the graph supersedes it yet.

  • AI compatibility75/100

    • Because open specifications are implemented by the open-source decoders that ML stacks rely on.
    • Because lossless pixels avoid compression artefacts leaking into training data.

  • Everyday consumer usage75/100

    • Because it opens by double-clicking on every mainstream device.
    • Because it is a current format that people and services still expect.

  • Printing suitability71/100

    • Because lossless data means no compression artefacts appear at print resolution.

  • Popularity71/100

    • Because it sits at the centre of the format ecosystem, with many documented relationships.
    • Because every mainstream operating system handles it.
    • Because it is still current rather than being phased out.

What FLAC is not recommended for

  • Compression efficiency23/100

    • Because it stores data losslessly, so files stay large.
    • Because its codec generation predates modern entropy coding and block partitioning.

  • Software compatibility33/100

    • Because only a narrow set of applications handles it.

Related to FLAC

File extensions

Media types

Compression used

Compared with

Data quality

Every claim on this page is classified as a verified fact, a derived fact or an assumption.

Overall confidence
93%
Verification status
verified
Last reviewed
2026-08-03
Verified facts
2

2 classified claims backed by 1 source.

Sources and review status

Review status: verified · confidence 95%

Last reviewed 2026-08-03 (revision 1).