100% Client-Side · No Uploads

PDF Annotator & Highlighter

Highlight, underline, add text notes, and draw on any PDF — right in your browser. No uploads, no accounts, no subscription.

Compare with Adobe Acrobat

What you can do

  • Highlight text with color
  • Underline passages
  • Add text notes anywhere
  • Freehand draw with a pen tool
  • Eraser to remove annotations
  • Download the annotated PDF
  • Works offline after first load
  • Files never leave your device

Why this exists

Adobe Acrobat Pro costs $240/year and requires a subscription for most features. Other online tools upload your documents to their servers. This tool does neither — everything runs locally using pdf-lib and the Canvas API. Your files never leave your device.
Is it free? Yes. No signup, no watermarks, no limits. Just open a PDF and annotate.
Does it work offline? Yes, after the first page load (pdf-lib and pdf.js are loaded from CDN). Your PDF file stays on your device the entire time.

PDF Annotator

Upload a PDF to start annotating

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