Place your handwritten signature image on a PDF, choose the page and position, then download the signed copy. This is not a certificate-based digital-signature service.
Place an image of your signature onto a PDF and download the signed document.
It places a visible image of your signature on the page, which is what most everyday agreements ask for. It is not a cryptographic digital signature with an identity certificate, so where the law or the other party requires a qualified signature, use a certified service instead.
No. Both the PDF and your signature image stay in your browser, which matters given that a signature image is worth protecting.
Sign a sheet of white paper, photograph it, and remove the background so only the ink remains.