HTML5 Canvas Save Drawing as an Image
To save the canvas drawing as an image, we can set the source of an image object to the image data URL. From there, a user can right click on the image to save it to their local computer. Alternatively, we could also open up a new browser window with the image data url directly and the user could save it from there.
Note: The toDataURL() method requires that any images drawn onto the canvas are hosted on a web server with the same domain as the code executing it. If this condition is not met, a SECURITY_ERR exception is thrown.