HTML5 JavaScript canvas based smooth signature drawing - Online / web signature capture / hand draw signature input
This JavaScript library make it possible to hand draw smooth signatures from user input, it's useful in some applications that require user signature for signups, it can output as svg and png formats, and you can use PHP or other server side language to capture the output signature image and store for further use.
https://github.com/szimek/
HTML5 canvas based smooth signature drawing http://szimek.github.
Demo
Demo works in desktop and mobile browsers. You can check out its source code for some tips on how to handle window resize and high DPI screens. You can also find more about the latter in HTML5 Rocks tutorial.