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

OpenType specification version 1.7

• OpenType overview
• The OpenType font file
• Font file tables
• Recommendations

Appendices

• 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
• OpenType Mirroring Pairs List
• Adobe technical note #5176: “The Compact Font Format Specification.”
• Adobe technical note #5177: “Type 2 Charstring Format.”
• Specification changes log file

OpenType 1.70 is fully equivalent to the ISO/IEC 14496-22:2015 (3rd edition) “Open Font Format” standard. The standard will be published in June 2015 and at that time will be freely available for download from theISO website.

Updates to this specification are noted in the change log.