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background-position: -px
-px;
width: px;
height: px;
Enter an image URL, or upload an image file, then click the zoomed image to mark sprite position and size.
Due to browser security restrictions, scripts are not allowed to access the local filesystem. To work around this, the file is uploaded to the server and read from there.
When the file gets uploaded, it is simply Base64-encoded and sent back to the client; it is not recorded in any way.