The PNM file format stores data in the PNM format. Converting to PDF produces a document file that stores fixed-layout pages with embedded fonts, vector graphics, and page geometry defined by ISO 32000. This conversion changes the file's encoding, compression method, and supported feature set. Text content, headings, and basic formatting are transferred; complex features such as macros or embedded objects may not translate fully. This makes PDF the practical choice when the destination system requires it or when the target format offers better compatibility or compression. 1converter runs this conversion on the server: your file is uploaded encrypted over HTTPS, converted using trusted open-source libraries, and the output is held for 24 hours before automatic deletion.