I can't do many things with PDF/A format files that I could do with regular PDF files such as 'cropping' the document etc.
How can I convert PDF/A to normal PDF document?
I installed PitStop pro but couldn't find it.
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You don't tell us, but I assume it: you are using Adobe Acrobat in order to 'crop' your PDF/A? Which exact version is it?
Anyway, in the Preferences > Document settings, you can switch off a Display PDF/A in PDF/A-mode.
Once you've done that the blue horizontal band informing you about the PDF/A property of the file at the top of each page will disappear, and it will be possible to manipulate the file. (You may need to re-open the PDF).
Once manipulated (and saved), the PDF/A property will be lost anyway.
Viewing PDF/A files in PDF/A-mode prevents Acrobat from changing the file (since PDF/A is for archiving).
If you just wish to convert the PDF/A to a normal PDF, and save it for later editing, you can use Adobe Acrobat as suggested by user Mrtymccarter on Jun 26 '12. This is a follow-up on the comment made by Canadian Luke on Sep 25 '13, to include essential parts of the answer.
Instructions (Adobe Acrobat XI)
The newly created action should be available below Action Wizard -> Actions.
Click it to remove PDF/A information.
(As described in the previously posted Adobe blog post)
You can also remove it in Foxit PhantomPDF - it is much better then Acrobat: fast, less weight, it remembers last opened page for any pdf (Acrobat doesn't remember it for any pdf file, only some)
How to remove PDF "A" infomation in "Foxit PhantomPDF":
PDF/A document is considered an archive that should not be changed. If you have Adobe Acrobat, you can remove PDF/A. http://blogs.adobe.com/acrolaw/2011/05/how-to-remove-pdfa-information-from-a-file/
You can easily do this from Preflight in Adobe Acrobat X.