1. Open OpenOffice.org Writer .
2. Click File > Export as PDF...
3. In the General tab in the PDF Options window .
a. Click the Reduce image resolution checkbox and set the value to the right to 300 DPI.
b. Check the PDF/A-1a checkbox.
c. Uncheck the Export bookmarks checkbox .
4. Enter a File name and click the Save button .
5. Your PDF has been created