Annotate PDF Online Free — Add Text, Highlights and Shapes

Annotate your PDF documents directly in your browser with no software installation required. Add text boxes, highlights, rectangles, arrows and sticky notes. All processing is local — your files never leave your device. Completely free, no sign-up.

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How to annotate a PDF online

  1. Upload your PDF — Click to select your file or drag and drop it into the upload area.
  2. Choose an annotation tool — Select from text box, highlight, rectangle, arrow, line or sticky note.
  3. Annotate your document — Click or draw on the page to place annotations. Move, resize or delete them as needed.
  4. Save — Click "Save" to download the annotated PDF instantly.

Annotation tools available

  • Text box — Add typed text anywhere on the page in your chosen font size and colour.
  • Highlight — Draw coloured highlights over text to emphasise key sections.
  • Rectangle / shapes — Draw rectangles, circles and shapes to frame areas of interest.
  • Arrow — Point to specific areas with directional arrows.
  • Sticky note — Add comments that display as collapsible notes.

Why use desPDF to annotate PDFs?

  • 100% private — Your PDF never leaves your browser. Zero uploads to any server.
  • No installation — Works in any modern browser with no plugins or apps to install.
  • Completely free — No subscription, no trial, no hidden costs.
  • No account needed — Annotate immediately without creating an account.
  • Instant download — The annotated PDF is generated and downloaded in seconds.

Frequently asked questions

Are my PDF files sent to a server?

No. All annotation processing happens entirely in your browser. Your files never leave your device.

What annotation types are supported?

Text boxes, highlights, rectangles, arrows, lines and sticky notes are all supported.

Can I edit or delete annotations after placing them?

Yes. Click any annotation to select it, then move, resize or delete it before saving.

Does the tool work on mobile?

Yes, the PDF annotator works on smartphones and tablets in any modern mobile browser.

Other free PDF tools

  • Merge PDF — combine multiple files
  • Rotate & Reorder PDF pages
  • Delete pages from PDF
  • Extract pages from PDF
  • PDF password protection

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