I don't usually review tools like this, since it's not really no-code. But I love it so much I wanted to include it.

Inside GMail, Dochub is probably already installed. When you click a PDF and it opens the GMail PDF viewer, at the top there's a small dropdown that lets you open the document in Dochub.

Their free plan is all I've ever needed. It just opens the document and gives you all the basic features you need to edit the document right then and there.

You download it, send it back, and you're on your way. Stupid simple, super easy, and it's saved me a lot of time by being right where people send me documents.

Anyway, I'm sure there are plenty of other good, free options in the PDF editing space, but I wanted to highlight this one because it's made a significant difference in my life.