specification

RFC 1951 (DEFLATE)

The specification of the Deflate compression algorithm.

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What the specification defines

Deflate combines LZ77 matching with Huffman coding and underpins ZIP, gzip, PNG and every OOXML document.

Identifier
RFC 1951
Published by
IETF
First published
1996

RFC 1951 (DEFLATE) scores

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

Overall score

87/100

  • Archiving score

    100
    • it is a current, actively maintained format
    • an official specification document is publicly reachable
    • it is actively maintained and current

    Confidence 39% · evidence coverage 78%

  • AI score

    100
    • an official specification document is publicly reachable

    Confidence 42% · evidence coverage 29%

  • Openness score

    100
    • an official specification document is publicly reachable

    Confidence 42% · evidence coverage 60%

  • Longevity score

    92
    • it is actively maintained and current
    • an official specification document is publicly reachable
    • it is a current, actively maintained format
    • it occupies a niche corner of the ecosystem

    Confidence 40% · evidence coverage 100%

Specified by

Data quality

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

Overall confidence
94%
Verification status
verified
Last reviewed
2026-08-03
Verified facts
2

2 classified claims backed by 2 sources.

Sources and review status

Review status: verified · confidence 90%

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

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