Annotate PDF
Add 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.
How to use Annotate PDF
Add your file
Choose a file or drag it onto the upload box. We check that the file type and size are supported.
Pick your options
Change the settings shown next to the file if you need to. The defaults work for most files.
Download the result
Click the main button, then download your new file. Check it before you share or submit it.
What it does
- ✓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
When to use it
Mark typographical errors, suggest wording changes, and highlight key approval clauses.
Provide constructive feedback, score margins, and highlight corrections on academic essays.
Circle dimensions, add revision notes, and indicate electrical and plumbing changes.
Highlight disputed terms and add explanatory margin comments for legal counsel.
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.