specification
RFC 1951 (DEFLATE)
The specification of the Deflate compression algorithm.
Convert a file nowWhat 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%
Related to RFC 1951 (DEFLATE)
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.
- Convert Always editorial review — Convert Always
- RFC 1951 — DEFLATE Compressed Data Format Specification — IETF
Sources and review status
Review status: verified · confidence 90%
Last reviewed 2026-08-03 (revision 1).
- Convert Always editorial review — Convert Always