Annotate Your PDFs
Whether you're reviewing a document, providing feedback, or adding notes for reference, UnblockPDF's annotation tools make it easy to mark up any PDF.
Available Annotation Tools
Text boxes let you add new text anywhere on the page. Ideal for placing comments, additions, or missing information directly on the PDF page.
Highlights draw attention to important passages with colored overlays. Mark key sections in different colors to visualize priorities or responsibilities.
Sticky notes add collapsible comments without cluttering the document. Practical for more detailed annotations that should not be directly visible on the document surface.
Shapes like rectangles, circles, and arrows help point out specific areas or illustrate connections graphically.
Freehand drawing gives you complete freedom to mark up the document naturally, and is especially useful on tablets and touchscreen devices.
Common Annotation Scenarios
Team document review: Multiple people can add annotations to a contract draft, presentation, or report one after another. Use different colors for different reviewers so that attribution remains clear.
Proofreading: Mark typos, missing information, or stylistic suggestions directly in the document. A text box next to the marked area explains the desired change.
Teaching and training: Instructors and trainers can annotate student work, reports, and drafts with feedback and return the commented PDF.
Organizing Annotations Effectively
Use a consistent color scheme: red for urgent corrections, yellow for notes, and green for positive feedback. Place text boxes so they do not obscure the actual content — along the margins or between paragraphs works best. When annotations are no longer needed after revisions, you can flatten the document to permanently embed all markings, or create a clean version without annotations for the final distribution.
Finalizing and Sharing Annotated Documents
Before sharing a commented PDF, review whether all annotations are understandable and positioned correctly. If the document has become too large due to many annotations and needs to be sent by email, the Compress tool can reduce the file size without losing any of your markup.