An important part of any web development is to ensure the web page that is downloaded to the browser as small as possible, although it is now being intensely people use a CDN to improve web performance.
CSS sprites are a way to reduce the number of HTTP requests made to the source image on your site. Images are combined into one larger image and defined in the X and Y coordinates. Having assigned this generated image to relevant page elements the background-position CSS property can be used to shift the area shown in the image of the necessary components, this technique will improve your site performance.
csssprites.com
spritebox.net
css-sprit.es
spritegen.website-performance.org
css.spritegen.com
this list is terrible. you just took it from google’s top search results!