Signature Height : small / medium / tall

[baba_sawane]

What I suggest : 

Why ?

This is a signature field.

 100% of the signatures I'm collecting from dozens of mobile users are partially out of the box. The box is simply too small on mobile. 

[Derick_Paula]

I had to resort to using drawing field for signatures because of the same problem…

[baba_sawane]

I tried it too. It's a countermeasure but reduce the point of having a signature field