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Annotate PDF

Annotate your PDF documents online with drawings, text, shapes, and highlights. Mark up and review your documents with easy-to-use annotation tools. 100% free, secure, and browser-based. Your files are processed locally in your browser and never uploaded to our servers.

Drag & drop your PDF or click to upload

PDF files only • Max 50MB

100% private • Processed in your browser

Discover More

Tips, guides & FAQs

Freehand DrawingText & ShapesHighlight & Eraser100% Private

What Is a PDF Annotation Tool?

A PDF annotation tool lets you add notes, drawings, text, shapes, and highlights to your PDF documents. It makes it easy to review and mark up documents without changing the original content. All processing is done locally in your browser, so your files never leave your device.

For more advanced PDF tasks, you can also try our Merge PDF, Split PDF, Compress PDF.

Freehand Drawing

Draw, sketch, or highlight directly on any page with customizable colors and stroke widths.

Text & Shapes

Add text boxes, rectangles, circles, lines, arrows, stars, and triangles with full formatting options.

Highlight & Eraser

Highlight important content with custom colors and opacity, or erase annotations.

Undo / Redo

Full undo/redo support – never worry about making mistakes (Ctrl+Z / Ctrl+Y).

How to Use

Follow these simple steps to get started.

1

Upload Your PDF

Drag and drop or select your PDF document.

2

Annotate Your Document

Draw, add text, highlight, or insert shapes to mark up your content.

3

Export & Share

Download your annotated PDF with all changes flattened into a single file.

Why Use This Tool?

Our PDF editor is free, private, and runs entirely in your browser – no sign‑ups required.

Real‑time Preview

Every annotation updates instantly – you see exactly what you get.

Full Page Control

Reorder, delete, rotate, duplicate pages – all with bulk selection.

Privacy First

Your PDF never leaves your browser – 100% client‑side processing.

Customizable Styling

Change colors, stroke widths, fonts, and highlight opacity to suit your needs.

Is This Tool Safe?

100% SECUREAll processing is done locally in your browser. Your PDF and annotations never leave your device.

Your file never leaves your device
No data transmitted over internet
No logs or data storage
Works offline after first load

Common Use Cases

From reviewing documents to adding feedback and notes, PDF annotation is useful for professionals, students, and anyone working with digital documents.

📄 Reviewing Documents📝 Adding Notes & Highlights📊 Marking Up Reports📚 Reviewing Research Papers🏢 Reviewing Business Proposals🎨 Providing Design Feedback📝 Editorial Reviews📑 Marking Up Forms and Documents

💡Tips & Best Practices

  • ✓Use the highlight tool with different colours to categorise feedback (yellow for suggestions, green for approved text).
  • ✓Combine text boxes with shapes to create professional callouts and annotations.
  • ✓Use the eraser tool to quickly remove unwanted annotations without affecting the PDF content.
  • ✓The undo/redo feature (Ctrl+Z/Ctrl+Y) makes experimenting with annotations risk-free.

Frequently Asked Questions

Yes – use Ctrl+Z (Cmd+Z on Mac) to undo, or Ctrl+Y (Cmd+Y on Mac) to redo any action.
Rectangles, circles, lines, arrows, stars, triangles, and ellipses – all with customizable colors and stroke widths.
Yes – use the "Insert Image" button to add PNG, JPG, or JPEG images anywhere on the page.
Absolutely – everything happens in your browser. No data is sent to any server.
Yes – choose from pen, text, shapes (rectangle, circle, line, arrow, star, triangle, ellipse), and highlighter.