Annotate PDF
Add text, highlights, rectangles, and arrows to your PDF. Free, instant, nothing uploaded.
Related tools
Everything you need to annotate a PDF
100% private — nothing uploaded
Annotating happens locally in your browser using pdf-lib. Nothing is sent to a server.
Text, highlight, rectangle, arrow
Four annotation types cover most markup needs, each in a color you pick.
Drag to position, resize freely
Place each annotation exactly where it belongs and resize it to fit.
Instant processing
No waiting for uploads — your annotated PDF is ready in seconds.
Works on every page
Navigate between pages and annotate wherever you need to.
Three steps to an annotated PDF
- 1
Upload your PDF
Drag and drop your PDF onto the page, or click to browse.
- 2
Add annotations
Pick text, highlight, rectangle, or arrow, then click on the page to place it. Drag to reposition, resize, and pick a color.
- 3
Save and download
Click Annotate PDF — your browser flattens every annotation into the document instantly. Download the result, nothing is uploaded.
Built for anyone who marks up documents
Whether you're reviewing a contract, studying a PDF textbook, or leaving feedback on a design — PixelTools annotates your PDF in seconds, free, with no upload.
Reviewing contracts
Highlight key clauses and add notes before sending a document back for revision.
Studying and research
Highlight passages and add margin notes on a PDF textbook or paper.
Marking up forms
Point out a missing field or add a rectangle around the section that needs attention.
Quick feedback
Add a comment directly on a proposal or design PDF instead of writing a separate email.
Frequently asked questions
Is this tool free?
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Yes, completely free with no limits. No account required.
Is my PDF uploaded to a server?
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No. Annotating happens entirely in your browser using pdf-lib. Your file never leaves your device.
What kinds of annotations can I add?
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Free text, highlights, rectangles, and arrows — each in a color you choose, placed anywhere on any page.
Can I edit an annotation after placing it?
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Yes. Select it to drag, resize, recolor, or (for text) edit the wording, right up until you click Annotate PDF.
Can I remove an annotation?
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Yes. Select it and click the × button that appears on its corner.
Annotate your PDF now
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