Scale All Images To Fit Container Proportionally

I am building a customization script where a user can upload an image and drag it around a template image to get a desired result. The problem is the template image is over 1000px

Solution 1:

I'm not quite sure if that is what you are asking for … anyway:

The CSS3 property background-size: 100% lets you specify that the background image of should fill out the container's size and stretch proportionally. Together with background-repeat: no-repeat it might be what you are looking for:

#uploaded {
    height: 500px;
    width: 500px;

    background-image: url(...);
    background-size: 100%;
    background-repeat: no-repeat;
}

Demo: http://jsfiddle.net/pu76s/3/