How to Annotate a PDF for Document Review

Document review is a collaborative process. Lawyers mark up contracts with proposed changes. Teachers highlight errors in student papers. Editors add comments to manuscripts. Without annotation tools, reviewers resort to printing documents and writing in the margins, then scanning the marked-up pages back into digital form.

PDF annotation lets you add highlights, text comments, freehand drawings, and stamps directly to the digital document. YourPDF.tools provides a full annotation toolkit that runs in your browser. Your documents stay on your device, making it safe to annotate confidential contracts, medical records, or proprietary materials.

Key Takeaways

  • •Annotations include highlights, text comments, sticky notes, freehand drawings, and stamps.
  • •Annotated PDFs maintain the original content while adding a separate annotation layer.
  • •Annotations are saved as standard PDF annotations, visible in any compliant PDF viewer.
  • •Browser-based annotation means sensitive documents never leave your device.
Annotate Your PDF for Review

Types of PDF Annotations

  • Highlight: Marks text with a colored background. Use yellow for general attention, red for errors, and green for approvals.
  • Text comment / Sticky note: Attaches a note to a specific location on the page. The note icon is visible, and the full text appears when clicked.
  • Strikethrough and underline: Marks text for deletion (strikethrough) or emphasis (underline). Essential for editing and proofreading workflows.
  • Freehand drawing: Lets you draw circles, arrows, or freeform marks to call attention to specific areas.
  • Text box: Adds a block of typed text directly on the page. Useful for inserting suggested replacement text.

How to Annotate a PDF for Review

  1. Open the Annotate PDF tool. Navigate to yourpdf.tools/annotate-pdf in your browser.
  2. Upload the document. Drag the PDF into the tool. It loads locally without being uploaded to a server.
  3. Select an annotation tool. Choose from highlights, comments, text boxes, drawing tools, or stamps in the toolbar.
  4. Add your markup. Click or drag on the page to place annotations. Type comments where needed.
  5. Save and share. Download the annotated PDF. Send it to collaborators for their review or further markup.

Annotation Workflow Best Practices

Establish a color code before starting a review. For example, yellow highlights for questions, red for errors, green for approved sections, and blue for informational notes. Consistent colors make it easier for the document author to process feedback from multiple reviewers.

Keep comments concise and actionable. Instead of "this is wrong," write "this date should be March 15, not March 12." Specific feedback reduces the number of review cycles and gets the document finalized faster.

Annotations vs. Editing

Annotations are a non-destructive markup layer — they do not change the underlying document content. The original text remains intact, and annotations can be removed later without any loss. Direct editing, on the other hand, modifies the actual PDF content, changing text, images, or layout.

For review processes, annotations are almost always preferable because they preserve the original and provide a clear record of feedback. Direct editing should be done by the document author after reviewing the annotations.

Annotate Your PDF for Review

Frequently Asked Questions

Can multiple people annotate the same PDF?
Yes. One reviewer annotates the document and shares it. The next reviewer opens the annotated PDF, sees the existing markup, and adds their own annotations. This creates a layered review trail that the author can process.
Will the recipient see my annotations in any PDF viewer?
Standard PDF annotations are part of the PDF specification and are visible in Adobe Reader, Preview, Chrome PDF viewer, and most other readers. Some very basic viewers may not display all annotation types, but major applications handle them well.
Can I remove annotations later?
Yes, annotations can be deleted in most PDF viewers and annotation tools. If you need to share a clean version after review, you can remove all annotations or flatten them into the page content to make them permanent.
Do annotations increase file size?
Minimally. Text annotations add very little data. Freehand drawings and stamps add slightly more, but the increase is usually negligible compared to the overall document size.
Annotate Your PDF for Review

Related Guides

Annotate PDFSign PDFFlatten PDF

Written by Andrew, founder of YourPDF.tools