Sketch on PDF is an Android application developed by mspnr that provides you with the ability to underline, comment, and sign your PDF documents. This app enables you to transform your page margins and utilize the infinite world of digital space without any frames.

The app is designed to be user-friendly, allowing you to sketch any diagram, schema, or outline directly on the page or with the help of freely adjustable bounds. It provides a range of features, including the ability to markup key words and sentences, write down your comments, extend margins, choose any color or brush, and scroll smoothly through the PDF without switching screens for each page. The app is compatible with all Android devices such as smartphones and tablets, equipped with S-Pen or Stylus.

Overall, Sketch on PDF is a great app for anyone who wants to annotate their PDF documents quickly and efficiently. If you have any suggestions, questions, or recommendations, please feel free to contact the mspnr support team.