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]
- Advanced typographic extensions (OpenType Layout)
- OpenType Layout Common Table Formats
- OpenType Layout Tag Registry
- The WGL4.0 character set
- TrueType fundamentals
- The TrueType instruction set
- Adobe technical note #5176: "The Compact Font Format Specification."
- Adobe technical note #5177: "Type 2 Charstring Format."
- Specification changes log file
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.