Annotate PDF Online

Add text, highlights, drawings and shapes to your PDF directly in your browser.

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Your PDF is processed in your browser and is not uploaded to our servers.

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How it works

  1. 1Choose your PDFOpen a PDF locally in the browser-based annotator without uploading it.
  2. 2Add annotationsHighlight important areas, draw freehand, add text notes and place rectangles, ellipses or lines.
  3. 3Download annotated PDFExport your markup onto a new PDF while preserving the original document.

Why use OneTools

  • Focused PDF markupUse text notes, translucent highlights, freehand drawing and outline shapes without unrelated editing tools.
  • Sticky annotation toolsAdd several highlights, drawings, text notes or shapes consecutively without reselecting the active tool.
  • Editable annotationsSelect, move, resize, format or delete annotations while keeping the chosen markup tool active.
  • Multi-page annotationNavigate page thumbnails and keep every annotation attached to its correct PDF page.
  • Undo and redoReverse annotation additions, moves, resizes, formatting changes and deletions.
  • Private browser processingYour PDF is loaded, annotated and exported locally in your browser.

Frequently asked questions

Can I highlight and draw on a PDF?

Yes. Add translucent rectangular highlights and freehand drawing to any page.

Can I add notes to a PDF?

Yes. Use the Text tool to place editable multiline notes anywhere on the document.

Is my PDF uploaded?

No. Loading, annotation and export happen directly in your browser.

Can I annotate multiple pages?

Yes. Use the page thumbnails to add different annotations to any page.

Does this edit the PDF's original text?

No. This tool adds visual markup and notes over the existing PDF content.

Can other people reply to annotations?

No. This version creates visual PDF markup; it does not provide comment threads or real-time collaboration.

Popular use cases

  • Highlight key passages in a PDF
  • Draw attention to areas that need revision
  • Write notes on forms or reports
  • Mark up design proofs with shapes
  • Add visual feedback before sharing a document
  • Underline or point to important content