Cid Font F1 F2 F3 F4

Adobe developed the format specifically to solve these efficiency problems. The core innovation was a two-part system that fundamentally separates the character encoding from the glyph shape data .

When a PDF is generated, the software compiles a list of fonts used in the document. To save space and simplify internal references, it assigns a short alias: cid font f1 f2 f3 f4