Annotate PDF
PDF → PDF
Add comments, highlights, and notes
About this tool
About Annotate PDF
Annotate PDF is a free, browser-based tool that lets you add comments, highlights, text notes, shapes, arrows, and drawings to your PDF documents. Collaborate on documents, provide feedback, or mark up important sections without altering the original content. It supports PDF → PDF annotation. Everything runs locally on your device, so your files are never uploaded to a server. There's no sign-up, no watermark, and no limit — just open Annotate PDF, add your annotations, and save or share your marked-up document instantly.
How to use Annotate PDF
1
Upload PDF
Drag and drop your PDF file or click to browse. Supports files up to 100MB.
2
Add Annotations
Use tools to add text comments, highlights, shapes, arrows, and freehand drawings.
3
Save Annotated PDF
Download your PDF with all annotations preserved. Share with others for collaboration.
Key features
Multiple Annotation Types
Add text comments, sticky notes, highlights, underlines, shapes, arrows, and freehand drawings.
100% Private
Annotate PDF processes your data locally in the browser. Nothing is uploaded, tracked, or stored u2014 your files never leave your device.
No Original Alteration
Annotations are added as a layer over your original PDF. The source document remains unchanged.
Collaboration Ready
Save annotated PDFs and share them with others for review, feedback, and collaboration.
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Professional PDF Annotation Applications
Trusted by reviewers, editors, and collaborators worldwide
Document Review
Add comments and highlights to PDF documents during review processes.
Example: Highlight changes and add comments to a contract PDF before final approval.
Academic Feedback
Provide feedback on student papers, essays, and assignments with annotations.
Example: Add comments and corrections to student essays for constructive feedback.
Legal Document Markup
Annotate legal documents, contracts, and court filings with professional markings.
Example: Highlight important clauses and add notes to a legal contract PDF.
Business Collaboration
Add annotations to business documents for team collaboration and feedback.
Example: Annotate a proposal PDF with feedback for your team to review.
Editorial Review
Mark up manuscripts, articles, and publications with editorial annotations.
Example: Add editorial comments and corrections to a manuscript PDF.
Invoice Clarification
Add notes and highlights to invoices to clarify charges or terms.
Example: Annotate an invoice PDF to explain specific line items to a client.
Report Analysis
Highlight key data and add comments to financial reports and analysis documents.
Example: Annotate a quarterly report PDF to emphasize important metrics and insights.
Project Planning
Add annotations to project documents, diagrams, and plans for team coordination.
Example: Annotate a project plan PDF with notes and assignments for your team.
Educational Materials
Annotate textbooks, lesson plans, and educational content for teaching purposes.
Example: Add notes and explanations to a textbook PDF for your students.
Medical Records
Annotate medical documents and records with professional markings and notes.
Example: Add annotations to a medical report PDF to highlight important findings.
Pro Tips for Effective PDF Annotation
Trusted by document professionals globally
Use Keyboard Shortcuts
Learn our keyboard shortcuts for faster annotation: Ctrl+Z for undo, Delete for removing annotations.
Color Code Annotations
Use different colors for different types of annotations (e.g., red for issues, green for approvals, yellow for questions).
Be Specific with Comments
Write clear, specific comments that explain exactly what needs to be addressed or changed.
Zoom for Precision
Use the zoom tool to add precise annotations to detailed sections of your document.
Use Multiple Annotation Types
Combine highlights, comments, and drawings to create comprehensive, clear annotations.
Preview Before Saving
Review all your annotations before downloading to ensure they're clear and accurate.
Standardize Annotation Style
Establish a consistent annotation style for your team to ensure everyone understands the markings.
Save Intermediate Versions
Save annotated versions as you work to track changes and feedback over time.
Combine with Edit PDF
Use our Edit PDF tool to make actual content changes, then use Annotate PDF to add review comments. Edit PDF.
Clear Naming Convention
Use clear file names (e.g., 'Contract_v2_Reviewed.pdf') to track different versions of annotated documents.
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