What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I'm not sure what kind of e-signature you need since most of them requires either a mouse (for desktops/laptops), or a stylus/finger for touch-screen devices.
We offer a variety of signature widgets and you can find them all by using "signature" as your search keyword on our Widgets Gallery: https://widgets.jotform.com/search/signature
1. Smooth Signature
4. Adobe e-Sign
The 4 above are the most commonly used by many. And in case you have a followup question about its validity, I recommend you read the article I'm linking below. Here's a snippet:
E-signatures are legally binding on almost all countries and states, but we still recommend consulting with your lawyer.
JotForm records the IP address and time of the signature made so that also provides additional confirmation about the signer of the document.
Related article: Announcing-E-Signatures-for-Forms