Someone emails you a PDF that says "please sign and return". Forward it to your SignMyDoc address. A minute later the signed, dated, filled-in copy is back in your inbox with the reply ready to send.
It works from the mail app you already use, on a phone, a tablet or a laptop.
Photograph it once. Every document gets the same hand-signed look, in blue or black ink.
Bank details, tax IDs and anything it isn't sure about are left for you, and listed in the reply.