Cidfont F1 F2 F3 F4 F5 F6 |top| Full

❌ even if they look similar. They are treated as separate resources by the PDF engine. Part 8: The Future – Will F1–F6 Become Obsolete? With modern PDF 2.0 and the widespread adoption of TrueType/OpenType Collections (TTCs) and Font Variation Tables , the need for synthetic F-tags is decreasing. However, legacy RIPs (many still running in newspaper and book printing plants) rely on the old CIDFont + F1–F6 model.

Introduction: The Ghost in the Print Stream If you have ever extracted a PDF generated by Adobe Illustrator, InDesign, or a legacy PostScript printer driver, you may have stumbled upon a strange sight in the font list: CIDFont+F1 , CIDFont+F2 , extending all the way to F6 . To the untrained eye, these look like corrupt or temporary font names. In reality, they are the backbone of robust, cross-platform printing. cidfont f1 f2 f3 f4 f5 f6 full

However, in many Adobe applications (specifically older versions of Acrobat Distiller, Illustrator, and InDesign), the tagging algorithm devolves into a predictable sequence when fonts are renamed during synthetic generation or font substitution . ❌ even if they look similar

The standard convention is: <BaseFont> + <6-character random or sequential tag> With modern PDF 2

❌ in a hex editor unless you fully understand PDF object references. You will break the internal font map.