# Super Simple viewer This is an extremely simple example of using the MuPDF.js module from a web browser. The page rendering runs directly on the main thread, so this viewer may cause your browser to slow down while it is loading the PDF document! To start a local HTTP server and open your browser to the viewer: npx http-server ../.. -b -o examples/super-simple-viewer Then click the "Browse..." button to load a local PDF file into the viewer. The viewer will then render all the pages in the PDF and insert them as images into the document.