XSL-FO Debugger is the software for visual debugging of XSL stylesheets. In short, XSL-FO Debugger takes an XSL-FO file as an input, follows XSL-FO formatting instructions and generates a PDF document as an output. The resulting PDF file may contain layers for displaying boxes (these are content box, allocation box, border box and padding box), baseline tables and breaks for the groups of FO objects and particular FO objects as well.