7-day free trial · then $5.99/month for all 16 tools
Annotate PDF Online — Highlight, Draw & Comment
Highlight text, underline, draw freehand, add shapes, arrows and sticky notes to any PDF — right in your browser.
Files never leave your device No installation
Review documents like a pro with PDF Suite Pro’s online PDF annotator. Highlight key passages, underline or strike through text, draw freehand with a pen tool, drop in shapes and arrows to point things out, and leave sticky-note comments for colleagues.
It’s perfect for marking up contracts, grading papers, reviewing designs or studying lecture notes — and because annotation happens locally in your browser, your documents are never uploaded anywhere.
Highlight & underline
Mark important text with customizable highlight, underline and strikethrough colors.
Freehand drawing
Sketch, circle and sign with a smooth pen tool in any color and thickness.
Shapes & arrows
Add rectangles, ellipses, lines and arrows to call attention to details.
Sticky notes
Leave comments exactly where they matter — great for feedback and review.
How to use the Annotate PDF tool
- 1
Open your PDF in the annotation tool.
- 2
Pick a tool: highlighter, pen, shape, arrow or sticky note.
- 3
Mark up the pages — undo and adjust colors as you go.
- 4
Download the annotated PDF with all your marks baked in.
Frequently asked questions
Can I highlight a PDF online for free?
PDF Suite Pro includes a 7-day free trial with full access to the annotator, then costs $5.99/month for every tool in the suite.
Will my annotations be saved into the PDF?
Yes. When you download, all highlights, drawings, shapes and notes are permanently embedded into the PDF so they show up in any PDF reader.
Is my document uploaded when I annotate it?
No. All annotation happens locally in your browser — the PDF never leaves your device.
Try Annotate PDF free for 7 days
One plan unlocks all 16 PDF tools plus 1 GB of cloud storage. $5.99/month after the trial — cancel anytime.
Start your free trial