If you’ve ever opened a PDF or a CAD drawing and seen warnings about missing "F1," "F2," or "CID+ F3" fonts, you know the frustration. These aren't actual font names—they are or internal font keys that software generates when it cannot locate the original Type 1 or TrueType font.
When software like Adobe InDesign or Illustrator exports a PDF and encounters issues embedding an OpenType font, it may convert that font into a CID (Character Identifier) If you’ve ever opened a PDF or a
These are or font aliases used in some PostScript printers (especially older models from Apple, HP, or Adobe‑licensed engines) and in certain PDF documents that rely on printer‑resident fonts rather than embedded subsets. " or "CID+ F3" fonts