A free e-sign PDF website should make signing boring in the best way: upload, invite, sign, done. Here is how SignThatDoc does that without turning into a PDF editor.
Step 1 — Upload the PDF
Start on the homepage of this free e-sign website. Choose a standard PDF and enter the email of the person who must sign. Optional: add your own email so you have a contact trail.
Step 2 — Mark signature areas only
Draw boxes where a signature belongs. Those boxes are the only places an invited party can stamp a signature. They cannot rewrite the file.
Step 3 — Share the URL and generated password
The website creates a private URL and a password for that document. Send both to the invited signee through a channel you trust.
Step 4 — The signee e-signs
They open the URL, enter the password, upload or draw a signature, and apply it to each prescribed box. When every box is filled, the signed PDF can be downloaded.
That is the entire job of a free e-sign PDF website done properly: signatures in, edits out.