CSS Sprite Generator

Upload multiple images to stitch them together into a single sprite sheet. We will automatically generate the background-position CSS required to display each image.
Sprite Preview Will Appear Here

What are CSS Sprites?

A CSS Sprite is a single image file that contains multiple smaller images, icons, or graphics stitched together. Instead of loading dozens of separate image files (which creates a bottleneck of HTTP requests), a browser only needs to download one master file.

How it works:

  • The Master Image: All your icons are combined into one grid or column.
  • The CSS Window: You apply the master image as a background to an HTML element (like a <div> or <i>), and restrict the element's width and height to the size of the specific icon.
  • Background Positioning: You use the CSS background-position property with negative pixel values to shift the master image around, showing only the specific part of the image you want visible inside the element's "window."

Frequently Asked Questions

Performance is the primary reason. Browsers limit the number of concurrent connections they can make to a server. If you have 30 separate icons, the browser has to request them one by one. Spriting reduces those 30 requests to just 1. Additionally, sprites prevent "hover flickering"—when you hover over a button and it briefly flashes blank because the hover-state image hasn't loaded yet. With sprites, the hover state is already loaded in the master image.

HTTP/2 handles multiple requests much better than HTTP/1.1 through multiplexing, meaning the penalty for loading many small files is significantly reduced. Because of this, and the rise of SVG icon fonts (like FontAwesome), traditional PNG spriting isn't as strictly mandatory as it used to be. However, it is still an excellent optimization technique for games, animation frames, and complex graphical assets that cannot be easily converted to SVGs.

First, download the generated image and host it on your web server. Next, copy the generated CSS and place it in your stylesheet. Make sure the url('sprite.png') path points to where you saved the image. Finally, in your HTML, assign the base .sprite class and the specific icon class to an element, for example: <div class="sprite icon-home"></div>.