| 4 Jan 95 | PBF draft 1 (Thomas Boutell) |
| 4 Jan 95 | delta-filtering (Scott Elliott) |
| 4 Jan 95 | deflate compression (Tom Lane et al.) |
| 4 Jan 95 | 24-bit support (many) |
| 5 Jan 95 | TeleGrafix LZHUF proposal (same or slightly larger) |
| 6 Jan 95 | PNG name (Oliver Fromme) |
| 7 Jan 95 | PBF draft 2 (Thomas Boutell) |
| 7 Jan 95 | ZIF early results (Greg Roelofs) |
| 7 Jan 95 | internal CRC(s) (Greg Roelofs) |
| 8 Jan 95 | gamma chunk (Paul Haeberli) |
| 8 Jan 95 | 48-, 64-bit support (Jonathan Shekter) |
| 9 Jan 95 | FGF proposal, implementation (Jeremy Wohl) |
| 10 Jan 95 | first NGF/PBF/proto-PNG mailing list (Jeremy Wohl) |
| 15 Jan 95 | PBF draft 3 (Thomas Boutell) |
| 16 Jan 95 | CompuServe announces GIF24 development (Tim Oren) |
| 16 Jan 95 | spec available on WWW (Thomas Boutell) |
| 16 Jan 95 | PBF draft 4 (Thomas Boutell) |
| 23 Jan 95 | PNG draft 5 (Thomas Boutell) |
| 24 Jan 95 | PNG draft 6 (Thomas Boutell) |
| 26 Jan 95 | final 8-byte signature (Tom Lane) |
| 1 Feb 95 | PNG draft 7 (Thomas Boutell) |
| 2 Feb 95 | Adam7 interlacing scheme (Adam Costello) |
| 7 Feb 95 | CompuServe announces PNG == GIF24 (Tim Oren) |
| 13 Feb 95 | PNG draft 8 (Thomas Boutell) |
| 7 Mar 95 | PNG draft 9 (Thomas Boutell) |
| 11 Mar 95 | first working PNG viewer (Oliver Fromme) |
| 13 Mar 95 | first valid PNG images posted (Glenn Randers-Pehrson) |
| 1 May 95 | pnglib 0.6 released (Guy Eric Schalnat) |
| 1 May 95 | zlib 0.9 released (Jean-loup Gailly, Mark Adler) |
| 5 May 95 | PNG draft 10 (Thomas Boutell) |
| 13 Jun 95 | PNG home page (Greg Roelofs) |
| 8 Dec 95 | PNG spec 0.92 released as W3C Working Draft |
| 23 Feb 96 | PNG spec 0.95 released as IETF Internet Draft |
| 28 Mar 96 | deflate and zlib approved as Informational RFCs (IESG) |
| 22 May 96 | deflate and zlib released as Informational RFCs (IETF) |
| 1 Jul 96 | PNG spec 1.0 released as W3C Proposed Recommendation |
| 11 Jul 96 | PNG spec 1.0 approved as Informational RFC (IESG) |
| 4 Aug 96 | VRML 2.0 spec released with PNG as requirement (VAG) |
| 1 Oct 96 | PNG spec 1.0 approved as W3C Recommendation |
| 14 Oct 96 | image/png approved (IANA) |