Using the FileReader-API it is
possible to read file content in the browser without sending anything to any server.
If you click on the "Add images" button, the application will render images onto a canvas, crop unused
pixels (alpha = 0) and use the base64 content to display an HTMLImageElement.
Once you click on the "Generate atlas" button, it will run an packing algorithm (based on operasoftware/TextureAtlas) to reposition
all images on a new canvas.
How to use this tool:
add images using the "Add images" button
modify css classname and atlas image name if you want to