What specifically and exactly do you mean by a "missing font"? I am not sure this concept actually exists in a PDF. Do you mean the PDF is fine but the font is neither embedded, nor available to the system?

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I can create a pdf where while saving a pdf doc, one can unembed fonts

This way we can create a pdf which we open on another machine, will not be properly rendered

I am creating a plugin which can detect which exact fonts are missing in the document

I will be able to use the detected data and then activate the fonts from my font inventory

Thanks for the interest 🙂

Ok, so it is non-embedded fonts you want to detect. I can think of two ways.

1. Enumerate pages, enumerate all text runs, check PDEFont for embedding flags.

2. Enumerate all font dictionaries in all Resources dictionaries (recursively into Form XObjects etc.), checking the FontFileXXX values in font attribute dictionaries.

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