If you are looking the best and secure tool to add page numbers on PDF files then, you can try CubexSoft PDF Bates Stamping Tool. It is an amazing and reliable application to add, put, insert page numbers and bates stamp to unlimited PDF files in bulk mode at once. The software has very simple GUI so that both technical and home users can easily handle and work with this tool without technical support. It allows you to add bates numbers on encrypted PDF documents, ranging from RC4x40, AESx128 & AESx256, RC4x128 without any data loss. Free demo version also available at free of cost.