PDF Version Numbers

When an operation which uses a part of the PDF standard which was introduced in a later version than that of the input file, the PDF version in the output file is set to the later version (most PDF viewers will try to load any PDF file, even if it is marked with a later version number). However, this automatic version changing may be suppressed with the -keep-version flag.

Here is a list of Acrobat versions together with the maximum PDF version they are intended to support:

PDF 1.2	Acrobat 3.0
PDF 1.3	Acrobat 4.0
PDF 1.4	Acrobat 5.0
PDF 1.5	Acrobat 6.0
PDF 1.6	Acrobat 7.0
PDF 1.7	Acrobat 8.0, 9.0, 10.0

If you wish to manually alter the PDF version of a file, use the -set-version option described in Section .