The easy way to draw on a PDF in Windows 11?

I often need to add handwritten notes, circle important sections, or sketch simple diagrams in PDF documents, so I started using KillerPDF. It's a Windows desktop application that supports freehand drawing, straight lines, highlighting, and text annotations. I can also adjust the color, line thickness, and opacity of my markings, making it a convenient way to draw on PDF in Windows 11 without dealing with a complicated editor.

Preparation:

• Download the installer or portable version from the official GitHub release page, then launch the application.
• Open the PDF document you want to annotate and navigate to the page where you want to add drawings.

Drawing Tools:

• Select the freehand drawing tool and use your mouse or touchscreen to doodle, circle important text, or add handwritten notes.
• Use the line, highlight, or text tools to create clearer annotations. Adjust the color, line weight, and opacity as needed.

Saving:

• If necessary, use the selection tool to move or resize annotations, then save the edited PDF with a new filename.
• Reopen the saved document to ensure that drawings and notes display correctly before sharing.

Notes:

• This app processes PDF files locally, so you do not need to upload documents to an online service.
• If you frequently draw on PDF in Windows 11, keep the original document as a backup and check the saved copy to ensure all annotations are preserved.