This is to convert a pdf document (not pdf/a) into pdf/a: gs -dPDFA -dBATCH -dNOPAUSE -dUseCIEColor -sProcessColorModel=DeviceCMYK -sDEVICE=pdfwrite -sPDFACompatibilityPolicy=1 -sOutputFile=output_filename.pdf input_filename.pdf Hope this will help some one!
A list of PDF/A validators is on the pdfa.org web site here: verapdf A free online PDF/A validator is available here: http://www.validatepdfa.com/ A report on the accuracy of many of these PDF/A validators is available from PDFLib: https://www.pdflib.com/fileadmin/pdflib/pdf/pdfa/2009-05-04-Bavaria-report-on-PDFA-validation-accuracy.pdf Se as well: https://www.pdflib.com/knowledge-base/pdfa/