LightShot is a screenshot tool, with which you can save any image on your screen with a simple push of a button.
As a bonus, instead of just saving the image to your hard drive, you can upload it straight to Internet via LightShot server, which is provided for free.
Along with this option, LightShot has something else that puts it head and shoulders above the competition. That is, you can edit the captured images online with an application that works just like the popular Adobe Photoshop (with layers, filters, colour correction, brushes, etc).
LightShot is, probably, the best option among all the programs available for capturing images from Internet.
The option to upload and edit images on the cloud is also perfectly implemented.
Lightshot is available for Windows/Mac, Chrome, Firefox, IE & Opera.