Awesome Screenshot: Capture & Annotate for chrome

Awesome Screenshot is an screenshot extension for chrome. It's free and easy to use. It's designed by very well-known bookmark sharing site "Diigo".
Awesome Screenshot https://chrome.google.com/extensions/detail/alelhddbbhepgpmgidjdcjakblofbmce

If you're looking for an easy way to screenshot web pages from within Google Chrome, Awesome Screenshot is a good choice. Awesome Screenshot makes it easy to grab both the visible portion and the entire web page with a single click. You can capture what you want, crop it, and use blur tool to hide the private data you don't want to share. You can annotate the image with text, circles, arrows, and lines in various colors.
Once you've captured and annotated your screenshot you can then save the image to your computer or upload to cloud. And quick links are provided for copying the URL, sharing on Twitter, Facebook,etc.
Here's a demo by Diigo 

As a browser add-on, Awesome Screenshot still have some shortcomings, it can only capture web pages and not good at deal with a lot of pics. However, also because Awesome Screenshot as the existence of the browser suite, complete with its built-in post-production tool bar, upload and share services... It's really convenient for bloggers or anyone who occasionally needs to capture web pages, it’s highly recommended.