Provides support for A4 paper sizes, superseding a LaTeX 2.09 package of the same name (the package was developed from a now-extinct package called a4dutch).

The a4 package is mostly superseded by the a4paper option of LaTeX itself and by the geometry package. Its margins are slightly narrower than those of the a4paper option (there are those that claim this is a typographically poor choice), but it also has a widemargins option.

See also geometry a4wide.

The authors are Nico Poppelier and Johannes L. Braams.