OpenType specification

The OpenType™ specification has been formatted in HTML, but may link to .PDF files.

OpenType specification version 1.4

self extracting archive [about 1.5Mb]

Appendices

OpenType version 1.4 has been contributed to ISO and became the foundation for the development of ISO/IEC 14496-22 “Open Font Format” standard. The standard was published in 2007, and is now freely available for download from ITTF website.