If you have your own personal library of PDFs, you will not have to pay for them. You can use Kami to create, edit, and edit PDFs and document files without paying a penny. 

The extension supports several editing tools, including the ability to move, rotate, scale, delete, and add text or shapes. If you are more comfortable using a stylus, you can use the pen tool.

Teachers use Kami in the classroom or at home to easily mark up and mark down PDFs, documents, and presentations. Students will love the interactive features. They can use the app to highlight, remove, or add text. They can also use the camera or photo editor to create their own images or even add text to their photos.

Kami is a browser extension that is available to both students and teachers. It is supported by Google Classroom, Canvas, Schoology, and Microsoft Teams.