2022-08-31 00:00:00 Welcome! "Sketch on PDF" is designed for you to underline, comment and sign up your PDF documents. There are no frames anymore - now you can freely transform your page margins and use the infinite world of digital space. Benefits of using "Sketch on PDF" The App is very simple to use, so you can easily sketch any diagram, schema, outline direct in- or with the freely adjustable bounds around- the page.