OpenType specification (OpenType 1.6)

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

OpenType specification version 1.6

• 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

Updates to this specification are noted in the change log. OpenType version 1.6 is fully technically equivalent to the ISO/IEC 14496-22:2009 (Second Edition) “Open Font Format” standard. The standard was published in July 2009, and is now freely available for download from the ISO website.