Most “e-sign” products are contract platforms. Most people need a picture of a signature on page one. Sign PDF is that: draw with a mouse or finger, stamp, download.
It is not a PKI digital signature and we do not pretend it is. Schools, landlords and HR teams accept an image overlay every day.
Draw on a blank canvas, keep a PNG of your signature if you sign weekly, and never upload that PNG to a random converter. Here it never leaves the device.