About PDF Annotator

What Is PDF Annotator?

PDF Annotator is a web-based tool that lets you load PDF documents and images directly in your browser, draw freehand annotations on them using any combination of tools, and export the result as a flattened annotated PDF — all without any file ever leaving your computer.

It was built for teachers, students, designers, and professionals who need a fast, lightweight way to mark up documents without installing software or trusting their files to a cloud service.

Key Features

• 🖊️ Pressure-sensitive freehand pen — smooth variable-width strokes using stylus or mouse
• 🎨 8 annotation tools — pen, highlight, arrow, rectangle, circle, text, eraser, select
• 📐 Select & resize — click to select any annotation, drag to move, grab corners to resize
• 📄 PDF and image support — works with PDF, PNG, JPG, WEBP, GIF, BMP
• 📤 Export to PDF — download a flattened annotated PDF at 2× resolution
• 📽️ Presentation mode — full-screen page-by-page view for live presentations
• ⏱️ Auto-delete timer — annotations disappear after a set delay (great for live highlighting)
• 💾 Local storage persistence — annotations are saved per file in your browser automatically
• 🔒 Fully private — no server, no account, no data collection

Privacy Commitment

PDF Annotator was designed from the ground up with privacy as the core principle. Your documents, annotations, and preferences are stored only in your browser's local storage. No data is ever transmitted to any server. See our Privacy Policy for full details.

Technology

PDF Annotator is built with modern open-source web technologies:

The app is deployed as a fully static site on Cloudflare Pages — no server-side code, no database, no backend.

How to Use It

Open the app, drag in your PDF or image, pick a tool, and start drawing. When you're done, click Export to download your annotated PDF. For a full walkthrough of every feature, visit the User Guide.