[mbmjertan]

Acrobat Reader is one of the more poorly engineered programs I’ve used. And it recently asked me to sign in an account and give Adobe money to open a PDF??

Unfortunately I need to sign PDFs often (using an image of my physical signature or a digital certificate), and I haven’t used that didn’t suck more than Adobe in this. I haven’t tried Okular for this and Evince seemingly didn’t support this - but Preview (although an extremely great document reader in most regards) didn’t let me select an image of my signature, but asked me to either sign on the trackpad with my finger (how do you make that not look like you had nerve damage?) or show a picture of my signature to the webcam of my Mac so it would do extraction on it (which didn’t work at all after 20 minutes of attempting, but also why can’t I just select a photo??). Finally I figured out pdfjs in Firefox recently shipped image-based signing (still waiting on certs)

Of course, I could have edited the PDF in a better editor (GIMP even!), but.. why is such seemingly simple and common PDF work a horror show?

[usaphp]

You can use preview on a Mac to sign them

[rufugee]

As much as I despise the macOS experience, this small feature was a bright spot. So easy.

[jscyc]

I find Foxit Reader good for signing. You can also easily disable all the internet based "features" in the settings which I appreciate.

[wodenokoto]

Edges pdf viewer lets you draw on pdf after which you can print to pdf.

I use that to sign with “image of my signature” style of signing.

[stevesimmons]

If you want to add signatures, the best option is to use a PDF viewer that supports that directly (FoxIt Reader, for one). That saves the original PDF plus an annotation for the signature.

Second best is print using "Save as PDF". That saves the PDF as processed through the browser's PDF engine (PDFium, in the case of Chrome or Edge).

Worst choice is usually print using "Microsoft Print To PDF". That saves the PDF processed into a more generic way. Often the original text characters are replaced by drawings, and the final file size can be 10x what you expect.

[kochikame]

I guess you can't just use a photo because it would make it too easy to use someone else's signature