Annotate PDF
PDF ToolsAdd highlights, freehand drawings, notes, shapes, and comments to PDF pages.
Annotate PDF
About Annotate PDF
Add text callouts, highlights, sticky comments, geometric shapes, and freehand drawing marks directly onto PDF pages. Review blueprints, grade student assignments, and mark up design proofs directly in your browser.
View key capabilities & tips
Key capabilities:
- Versatile markup toolset: text notes, highlighter pen, bounding rectangles, arrows, and freehand drawing
- Adjustable stroke widths, opacity levels, and color palettes
- Interactive canvas rendering preserves high-resolution background page vector elements
- Downloads standard PDF annotations compatible with Adobe Acrobat and PDF viewers
Tips:
- Use high-contrast markup colors (e.g., bright yellow highlighter or red callout text) for visibility.
- Double-click any created annotation on the canvas to edit its text, color, or stroke width.
- Zoom into detailed diagrams before drawing freehand marks to ensure precision.