I am trying to learn about how pdf files are created, I couldn’t find any good or official reference to the internal structure of pdf files, like:
3 0 obj
<<
/Type /Pages
>>
endobj
Where could I learn about this?
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There is a section of Adobe’s website which references things related to the PDF file format.
The last time I checked, the only available source for the content was this ISO document. However, it seems Adobe has now released this document with the same technical content here.