OpenType specification

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

OpenType specification version 1.6

Appendices

Download full specification [about 1.8Mb]

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.