OpenType® Specification (OpenType 1.8.4)

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

OpenType specification version 1.8.4

• OpenType overview
• The OpenType font file
• Font file tables
• Advanced typographic extensions (OpenType layout)
• OpenType layout common table formats
• OpenType font variations overview
• OpenType font variations common table formats

Errata

• OpenType 1.8.4 errata

Appendices

• Recommendations
• OpenType Layout Tag Registry
• OpenType Design-Variation Axis Tag Registry
• TrueType outlines and instructions
  • TrueType fundamentals
  • Instructing TrueType Glyphs
  • The TrueType Instruction Set
  • Graphics State Summary
• OpenType Mirroring Pairs list
• Adobe technical note #5176: “The Compact Font Format Specification”
• Adobe technical note #5177: “Type 2 Charstring Format”
• The CFF 2 Charstring Format
• Adobe Technical Note #5902: “PostScript Name Generation for Variation Fonts”
• Specification changes log file

OpenType 1.8.4 incorporates revisions in Amendment 1 of the 4^th edition of the ISO/IEC 14496-22 “Open Font Format” standard. Current editions and amendments of ISO/IEC 14496-22 are freely available for download from the ISO website.

Updates to this specification are noted in the change log.