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Open your PDF file in Adobe Acrobat.
Click the Comment button in the toolbar to display the commenting tools.
Select the annotation tool you want to use, such as Note, Highlight, Text Box, or Draw.
Click on the PDF page where you want to add your comment or annotation.
Type your comment or draw your annotation as needed.
Click away from the annotation or press Escape to save your comment or annotation.
You can use multiple annotation types in one session, such as highlighting text and adding sticky notes for detailed feedback.
This runs in the Acrobat app - there is no separate API for this task.
Comments and markups are both ways to add feedback to a PDF. Comments usually refer to text-based notes like sticky notes or text boxes, explaining something. Markups are more about visual changes to the document itself, like highlighting text, underlining, striking through, or drawing shapes. Both serve to help you review and share feedback on a document, making it clear what changes or thoughts you have.
Sanitizing your PDF is important because comments and markups are stored as a separate layer. If you share a 'final' document without sanitizing, others can still see or even recover your review notes. This could lead to sensitive information being leaked or confusion about the document's final state. Sanitizing removes these hidden layers, making sure only the intended content is visible and permanent.
To draw a circle around an image in a PDF, you should use the 'drawing markup' tools within the 'Comment' section of Adobe Acrobat. These tools let you add shapes like circles, rectangles, or lines directly onto the document. Simply select the circle tool, then click and drag your mouse around the image you want to highlight.
To make your comments permanent and prevent them from being easily removed, you need to 'flatten' the PDF. Flattening merges the comments and markups directly into the document content, making them part of the main layer. This is different from sanitizing, which removes them. After flattening, the comments become fixed elements, just like the original text or images, and cannot be edited as separate comments anymore. This is often done when creating a final, uneditable version for printing or archiving.