Annotate PDF files with tools by PDF24

With PDF24 you can annotate PDF files easily and free of charge. You will find a suitable solution to this problem in the PDF24 toolbox. You do not need to install any software, because the app runs in your browser. This allows you to quickly add comments, markers, notes and other elements.

Annotate PDF files online

If you do not want to install any software or you need an online tool to annotate PDF files quickly, then the corresponding tool in the PDF24 online toolbox is the right one for you. PDF24 offers you various free online PDF tools with which you can easily solve many PDF problems, and with one of the tools you can annotate PDF files. This is how it works:

  • Simply open the app with the link below.
  • Drag the PDF file you want to comment into the file box.
  • The file is loaded and displayed.
  • Now you can get started. You can comment in many ways. You can:
    1. Highlight text
    2. Write and paint in the PDF
    3. Insert text with formatting
    4. Insert images and shapes
    5. Set opacity and colors of the elements
    6. Remove added items
    7. And much more
  • Then save your PDF when you're done commenting.

You can easily annotate and edit a PDF with a tablet and a pen. It almost feels like using a pen and paper, but electronically. The app is free and can be used by everyone.

Annotate PDF files online

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