Annotate PDF
Add comments, highlights, and review notes to any PDF.
Upload File
Drag & drop a PDF File here
or click to browse · Max 50 MB
100% Private
Your PDF is never uploaded, keeping your documents completely private.
Sticky Notes
Add pop-up comments anywhere on the page to explain or question specific content.
Text Markup
Highlight, underline, or strikethrough text to flag important passages or suggest changes.
Freehand Drawing
Draw freehand lines and arrows to point out specific areas on the page.
Undo / Redo
Step back through every change until you are satisfied with the markup.
About Annotate PDF
Annotate PDF documents online — free and fast. Add sticky-note comments, text highlights, underlines, strikethroughs, and freehand drawings to any page. Perfect for document review, collaborative markup, and study notes. Your document never leaves your device, keeping your files completely private.
Why use Annotate PDF?
Document Review
Mark up a colleague's draft report with highlighted corrections, sticky-note feedback, and strikethroughs before returning it for revision.
Academic Study
Highlight key concepts and add margin notes to research papers and lecture PDFs to build a comprehensive study resource.
Contract Review
Add comment annotations to specific clauses in a contract PDF to flag concerns or request clarifications before signing.
Design Feedback
Annotate a PDF proof with specific feedback and revision requests using sticky notes and freehand arrows pointing to areas that need changes.
How to Use Annotate PDF
Follow these simple steps to get your result in seconds.
- 1
Upload PDF
Drag and drop your PDF into the upload area or click «Select PDF File» to browse.
- 2
Select Annotation Tool
Choose from sticky note, highlight, underline, strikethrough, or freehand drawing tools in the toolbar.
- 3
Add Annotations
Click or drag on the page to add your annotation. Double-click a sticky note to type your comment text.
- 4
Review & Edit
Click any existing annotation to select, move, resize, or delete it. Use Undo to revert changes.
- 5
Download
Click «Download Annotated PDF» to save the marked-up document to your device.
Frequently Asked Questions
Everything you need to know about this tool.
Yes. Annotations are embedded in the downloaded PDF and visible in any standard PDF viewer that supports annotation display, such as Adobe Acrobat, Preview, and most modern browsers.
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