Credits and licences

Last updated 2026-10-08

Our own code

The paper engine (all patterns, the SVG preview and the PDF writer) and the page layouts are written for this site. No third-party JavaScript library is loaded, and the pages make no requests to other servers.

Standards and published values used

• PDF fonts: the generated PDFs use the PDF standard fonts Helvetica and Symbol, which every PDF reader provides; no font file is embedded. Text widths are computed from the Helvetica font metrics (AFM) published by Adobe.
• Paper sizes: US Letter, Legal and Tabloid (ANSI) and ISO 216 A3, A4 and A5, at their standard dimensions.
• Notebook rulings: wide rule 11/32 in, college rule 9/32 in, narrow rule 1/4 in.

Third-party material

None at present. If we add any library, font or data set, it will be listed here with its licence and a link.