I spent an afternoon trying a bunch of them some years ago. I settled on the freeware Master PDF Editor version 4 (version 5 inserts a watermark unless you buy

I spent an afternoon trying a bunch of them some years ago. I settled on the freeware Master PDF Editor version 4 (version 5 inserts a watermark unless you buy a license). https://code-industry.net/masterpdfeditor/ https://code-industry.net/masterpdfeditor/ It is super lightweight and opens any complex PDF. Can insert signatures, can edit anything in the PDF (without changing the font even if the font is embedded in the PDF—as long as all the glyphs you are typing are present in the font), etc. My only complaint is that it won't edit an encrypted PDF, but a one-liner Ghostscript command can remove the encryption automatically: https://gist.github.com/compleatang/6046249 https://gist.github.com/compleatang/6046249