I just had to sign some PDF documents and send them back to a software vendor. I hate the entire process of printing, signing, scanning, and emailing or faxing so I decided to find the easiest and most reliable way to do it online. After an hour of searching, signing up for various online services, and testing out their PDF-signing tools, I have to say HelloFax.com wins hands-down.
I had a scan of my real signature on my computer so that made the process easier but HelloFax lets you create signatures using a mouse or email a photo of your signature from your phone. I signed up for the free account, uploaded the PDF, uploaded my signature, placed the signature on the document appropriately, typed today's date & my name, and clicked "I'm done!" HelloFax instantly emailed me the signed PDF and I emailed it back to the company. The entire process took just a few minutes and did not cost me anything. I would have most certainly paid them $1/fax had I needed to use fax instead of email today.