Annotate PDF — draw boxes & markup

Annotate PDFs with arrows, text and shapes — private, no upload

Drop files here
or click to browse — any number of files

Annotate PDF Online — Draw, Highlight & Mark Up Any PDF

Add colored boxes, highlights, and markup to any PDF — all directly in your browser. No upload, no account, no limits. Your documents never leave your device.

How to Annotate a PDF

  1. Drop your PDF onto the page or click "Choose file" — rendering happens locally, no upload
  2. Select an annotation tool: colored box, highlight, or markup overlay
  3. Click and drag to place your annotation on the PDF page
  4. Adjust color and opacity, then download the annotated PDF

When to Annotate a PDF

Document Review: Draw boxes around figures or data points, highlight key sections, and mark areas that need revision before sharing with colleagues.

Academic Use: Annotate research papers and textbooks with colored boxes to group related concepts or flag sections for further reading.

Legal & Contracts: Mark important clauses and deadlines with boxes or highlights before signing or presenting to stakeholders.

Design Feedback: Add colored annotations to PDF mockups or layouts to communicate changes clearly without editing the original.

Is It Safe to Annotate PDFs Online?

Yes. PDFree annotates your PDF entirely in your browser using pdf-lib. Nothing is uploaded to any server — no one sees your document or your annotations. This makes it safe for confidential business documents, legal files, and personal records.

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