: Labels like "F1" or "F2" are internal aliases assigned by PDF generation software (like InDesign or online converters) to represent specific font subsets within a file.
: Preflight checks in professional software like Adobe Acrobat may report "CIDFont+F1 contains bad/widths," leading to poor print quality even if the document looks fine on screen. cidfont f1 normal fixed
This is where CIDFont F1 shines. Because it is often a "base 14" font or a substituted CID font within a PDF renderer: : Labels like "F1" or "F2" are internal
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