A picture is worth a thousand words

J-Painter is an image editor that allows drawing within a browser.
It can be used as a component of cloud applications.
The GUI can be configured for specific needs, for example:

The image can be loaded in PNG, JPEG, GIF formats
and saved on the server in PNG or JPEG format.

The editor is compatible with: Google Chrome, IE9+,
Firefox 3.6+, Safari 5.0+, Mobile Safari (iPad), and
the Android browser.

No plugins, no 3rd party libraries in the browser.
Only HTML5 <canvas>. More details ...

Previous Java based version of J-Painter can be found here ...