OpenType® specification (OpenType 1.8.2)

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

OpenType specification version 1.8.2

• 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 1.8.2 errata

Appendices

• Recommendations
• OpenType layout tag registry
• OpenType design-variation axis 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”
• The CFF 2 Charstring Format
• Adobe Technical Note #5902: “PostScript Name Generation for Variation Fonts”
• Specification changes log file

OpenType 1.8.2 incorporates revisions in Amendment 1 and Draft Amendment 2 of the ISO/IEC 14496-22:2015 “Open Font Format (3rd edition)” standard. Additionally, it incorporates extensions not included in ISO/IEC 14496-22:2015 plus Amendments 1 and 2, including the 'MERG', 'meta' and 'sbix' tables, and all of the addtions related to OpenType Font Variations. 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.