PDF version 1.7 by default?

[Ulrike Fischer]

Am Sat, 8 Feb 2025 15:17:35 -0700 schrieb Karl Berry:

> At the pdfTeX level (as you know), it can be done simply with
> \pdfminorversion = 5

If the current pdfversion is 2.0 setting only the minor value is not
enough, you would end up with 2.5. So people should always set also
the major value to be on the safe side.

 
> But XeTeX and LuaTeX are more complicated. And I don't know if there is
> a LaTeX-level interface outside of \DocumentMetadata.

The expl3 command  \pdf_version_gset:n{1.5} will set the version for
pdflatex, lualatex and engines using dvipdfmx as backend. It doesn't
work for dvips where one has to use the command line option
-dCompatibilityLevel of ps2pdf..



-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/