> This is not a pro tip.

I think there's also the implication of 'pro', as if the rest of HN are not software professionals. I'd suggest GP to revise the structure of their comment in order to not offend the entire forum.

Most of the PDF editing I do is the equivalent to physically typing over, covering over, or cutting elements out of a print document. I would not expect a an editor to be able to (for example) reflow the layout of PDF.

I just opened a PDF in LibreOffice, and immediately exported it to PDF, without making any changes.

I deliberately chose a PDF with very few images, simple formatting and very few fonts.

The output PDF differed materially from the original:

- not only was the font different, but the original fixed-width font had been replaced with a proportional font

- multiple lines that had consistent horizontal alignment in the original were now jagged

- numbers that were in a column are now no longer directly below each other