DataURI2Image is Chrome Extension which makes a image from the selected Data URI scheme and can check it.
How to use
1. Select data URI scheme on Web site like gist, blog
ex) data:image/png;base64,iVBORw0KGgoAA...
2. Click "Data URI to Image" from context menu
Data URI scheme samples
https://gist.github.com/shoito/5868550