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The PDF file format specification has 971 pages. https://www.iso.org/standard/63534.html



Just create a simple PDF example by using TextEdit's export function, and open the PDF with a plain text editor, you should be easy to figure out what's going on in PDF.


AFAIK, if you read through the first few chapters of the PDF spec, then you can easily understand later chapters. PDF in itself is a simple format.




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