Chrome //
Extensions 
Chrome
Web store 
Web Paint Tool - draw online
Draw rectangle, circle, lines and others shapes or add text on any web pages, then make screenshot the result.
Paint Tool by Painty
Paint tool to draw shapes, add text on web pages in real-time, make a screenshot, and download or share the screenshot with friends.
Web paint tool - Drawww
Draw shapes, lines, add text to live web pages. Annotate online, take screenshot, download PNG, share with friends. Page marker
Paint Tool for Web
Draw any shapes, write text, erase directly on the page, take a screenshot of what you have drawn