@KurtPfeifle what do you mean? Naina Thag. With an hex editor you can inspect everything, even C source code, if you like. For data like a PDF you need to know how to interpret them. Programs which show the structure of a PDF are not showing you its 'source', they are interpreting (part of) the data (in a lower level than a pdf viewer does of course); rather helpful tool since dealing with a PDF at the level of the bytes is very error-prone. But yet, the PDF 'source code' is the very same file you can read with the hex editor (just since you expect non ASCII bytes) – Nov 3 '12 at 17:58.

Use the annotation and drawing markup tools to add comments to your PDF. Changes that you want in the source. Appears in comments, open the. Use the annotation and drawing markup tools to add comments to your PDF. Changes that you want in the source. Appears in comments, open the.

@KurtPfeifle since people tends to think they understand the Q better than the OP (who in fact took this as The Answer) and prefer to answer to what they would have asked about the topic. What a pity the OP did not get it. The meaning of 'raw source code' could be vague, but because of that, the most straightforward interpretation is welcome and the first try. About me, I've poked and peeked PDF files (with the spec at hand) just for fun in the most primitive way. It is not me not knowing 'much about PDF internals': it is you failing at understanding human language sentences and OP needs. – Nov 13 '12 at 21:47 •. Looking at the raw code of PDFs will not serve you much unless you also have an idea about its internal structure.