Add Shapes
Add rectangles, circles, lines, arrows
Highlight/Underline/Strikeout
Add text markup annotations
This tool processes your files entirely in your browser. Your documents never leave your device.
Input
Drag & drop PDF files here
or Browse Files
PDF, PDF•Max size: 100MB per file
Annotations (0)
Draw rectangles on the PDF to add annotations
About This Tool
Add text markup annotations to PDF documents with our free online highlighting tool. Apply highlights, underlines, and strikethrough effects to text for document review, emphasis, and editing marks, compatible with Adobe Acrobat Reader and all PDF viewers.
Select text and apply colored highlights in yellow, green, blue, or custom colors. Add underlines for emphasis or strikethrough to indicate deletions. Create professional document markups for review, editing, and collaboration.
All annotation processing happens locally in your web browser. Your documents never upload to external servers, ensuring privacy for legal documents, contracts, academic papers, and confidential materials requiring markup.
Perfect for document review and editing, marking important passages in research papers, indicating changes in contracts, or emphasizing key information for readers. Works with text-based PDFs from Adobe Acrobat, Microsoft Office, and other applications. Essential for document collaboration and review workflows.
Frequently Asked Questions
- Is Highlight/Underline/Strikeout free?
- Yes, completely free with no hidden costs, subscriptions, or usage limits. All tools are available at no charge.
- Is it safe to use Highlight/Underline/Strikeout?
- Yes, 100% safe. All processing happens locally in your browser. Your files are never uploaded to any server and never leave your device.
- What is the maximum file size?
- You can process files up to 100MB. Since everything runs in your browser, processing speed depends on your device.