Use Google Drawings for Signiture in Form
Overview
Simple Signature allows you to sign documents with no hassle. Just draw your signature, upload a photo/scan or type in your name, pick the handwritten font you like, tweak the color you like and hit Insert Signature button. Your signature will be placed as an image above the text. So you can easily move it around the document, resize as needed, rotate and duplicate if needed. Works perfectly for signing contracts, invoices, agreements and all kind of documents. Multi-language support: Latin, Indian Devanagari, Cyrillic.
Simple Signature for Google Docs will ask for the permissions shown below. Learn more Simple Signature for Google Docs will need access to your Google account This will allow Simple Signature for Google Docs to : 
View and manage documents that this application has been installed in See, create, and delete its own configuration data in your Google Drive 
Display and run third-party web content in prompts and sidebars inside Google applications Connect to an external service 
See your primary Google Account email address See your personal info, including any personal info you've made publicly available
Rate & review this app Share your experience to help others. Your review, profile name and photo will appear publicly in Google's services. Your review must comply with the Google Workspace Marketplace Comment Guidelines and Review Policies. Learn More A User of Simple Signature for Google Docs Not working for me. Says refused to connect... no way to uninstall and reinstall it that I can tell Your review, profile name and photo will appear publicly in Google's services. Your review must comply with the Google Workspace Marketplace Comment Guidelines and Review Policies. Learn More nice to have Your review, profile name and photo will appear publicly in Google's services. Your review must comply with the Google Workspace Marketplace Comment Guidelines and Review Policies. Learn More very nice Your review, profile name and photo will appear publicly in Google's services. Your review must comply with the Google Workspace Marketplace Comment Guidelines and Review Policies. Learn More its not allowing me to open it. uninstall. waste of time Your review, profile name and photo will appear publicly in Google's services. Your review must comply with the Google Workspace Marketplace Comment Guidelines and Review Policies. Learn More so easy and free I love Google products Your review, profile name and photo will appear publicly in Google's services. Your review must comply with the Google Workspace Marketplace Comment Guidelines and Review Policies. Learn More Could not use Your review, profile name and photo will appear publicly in Google's services. Your review must comply with the Google Workspace Marketplace Comment Guidelines and Review Policies. Learn More Dmitry Astapkovich November 22, 2020 Any details on what was off specifically? Only works in google docs. If your google docs is from a Word Document (if it says ".DOCX" to the right of the title), it won't work. When it does work, it's great! Your review, profile name and photo will appear publicly in Google's services. Your review must comply with the Google Workspace Marketplace Comment Guidelines and Review Policies. Learn More Following the installation directions, the Simple Signature Add-On (and the Add-Ons menu item for that matter) doesn't show up in the menu bar. Can't use it. Your review, profile name and photo will appear publicly in Google's services. Your review must comply with the Google Workspace Marketplace Comment Guidelines and Review Policies. Learn More Dmitry Astapkovich June 20, 2021 It should appear in the Add-ons menu. Have you checked there? It's very very very good and sample Your review, profile name and photo will appear publicly in Google's services. Your review must comply with the Google Workspace Marketplace Comment Guidelines and Review Policies. Learn More Wouldn't work after installing despite the fact that I followed the install instructions. Your review, profile name and photo will appear publicly in Google's services. Your review must comply with the Google Workspace Marketplace Comment Guidelines and Review Policies. Learn More
Use Google Drawings for Signiture in Form
Source: https://workspace.google.com/marketplace/app/simple_signature_for_google_docs/766931269388