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How can I prevent the PDF version number from increasing?
After saving the PDF, the version number changes but my PDF Profile is not setup to do so. Alternatively, I've changed the version number of the PDF file using a Preflight Profile or Action List, however Acrobat doesn't reflect this change.
There are two ways to interpret the PDF version number of a PDF file:
1) The version number which is stored in the PDF file. You can see this version number when you open the PDF file in a text editor such as Notepad on Windows or TextEdit on Mac. At the top of the information, you will see something like this:
This indicates that the PDF version which is stored in the document is version 1.3. If you use a Preflight Profile or Action List to change the PDF version, then this is the information which will be changed.
2) The version number depending on which PDF features are used in the PDF document. Each new PDF version introduces new functionality which can be used. This means that if you have a PDF file which uses functionality which is available starting from version 1.5, then you can argue that this is a version 1.5 file, even if the version number which is stored in the PDF file says otherwise.
When Acrobat shows the PDF version, it first checks which version is stored in the file. After that, it will check the features which are used in the PDF file and from which version they are available. If the features used in the PDF are only available in a version higher than the version stored in the document, then it will not display the version stored in the document. Instead, it will show the version which introduced the PDF features used in the document.
This means that if you process a document and the PDF version shown in Acrobat changes when the Preflight Profile is not setup to do so, then there is a task done in the Preflight Profile which adds functionality which is not available in the PDF version stored in the document, hence, Acrobat shows a higher PDF version.
If you used a Preflight Profile or Action List to lower the PDF version and Acrobat doesn't reflect this lower PDF version, then the PDF document uses functionality which is higher than the PDF version stored in the document.