Instead of looking for "F1.otf" (which does not exist as a standard filename), you need to install the actual referenced fonts. Below are the most common matches for F1–F7 and where to download them legally for free.
When you open a PDF generated by a Canon printer, SAP, or AutoCAD, you might see:
"Cannot find or create font 'F1'" or "CID Font F2 is missing" CID font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download
Technical Reality: F1 is not the font name. It is a font alias or a registry mapping key. The actual font is likely:
These usually map to standard CJK (Chinese/Japanese/Korean) fonts or base PostScript fonts like: Instead of looking for "F1
If you are seeing "F1," "F2," etc., you are likely looking at internal PDF object references or printer font substitutions, rather than the actual names of commercial fonts.
Because Noto fonts are CID-keyed and support Adobe’s character ordering (Adobe-Japan1-6), which is exactly what /F1 and /F2 expect. They act as drop-in replacements. "Cannot find or create font 'F1'" or "CID
When a PDF is created, the software often renames embedded fonts to generic placeholder names to save space or because the font was not fully embedded.
If you open a PDF in Adobe Acrobat or a vector editing program and see "F1," it means the program is using a generic reference to display the text, often because the original font data is missing or substituted.