In the digital world, file formats can often become a barrier to sharing and viewing documents. While PDF is universally accepted, older or less common formats like P65 can cause frustration. If you’ve come across a file with a .p65 extension, you likely need a reliable way to convert it to PDF. Here’s everything you need to know about using online P65 to PDF converters. What is a P65 File? First, a quick clarification: A .p65 file is most commonly associated with Adobe PageMaker 6.5 , a desktop publishing program that was popular in the 1990s and early 2000s. PageMaker was a precursor to Adobe InDesign.