Do you need to annotate PDF files quickly without installing any software? Whether you're a student, teacher, or professional, our free online PDF annotation tool helps you highlight, comment, draw, or edit PDFs easily and securely. All you need is a browser. Start using our Annotate PDF tool now!
PDF annotation refers to adding comments, highlights, shapes, or drawings to a PDF document. It enhances collaboration and improves productivity. According to Wikipedia, PDFs are widely used for document exchange because they preserve formatting across devices.
There are many reasons why users choose to annotate PDF files:
Interested in more tools? Try our Merge PDF or Split PDF services to manage multiple files easily.
Quickly highlight key text in multiple colors. This helps with easy scanning and emphasis.
Insert sticky notes or comments in the margin to provide feedback, ask questions, or explain ideas.
Draw freehand lines, circles, or underlines to mark specific parts. Ideal for visual annotations.
Add rectangles, arrows, and circles to direct attention or segment sections.
Use the text box feature to add content or use our Sign PDF tool to insert a digital signature.
Need to reduce your file size? Check our Compress PDF tool for fast optimization.
Whether you’re using an Android phone, iPad, or laptop, our platform supports PDF annotation across all major operating systems. You can work from anywhere, anytime.
We use end-to-end encryption and delete all uploaded files after 1 hour. Learn more about PDF security practices from Adobe’s security page.
Start annotating your PDF files today. It’s fast, secure, and completely free. Click below to upload a file:
Yes. Even scanned documents (as images) can be marked up using drawing tools.
Yes. All tools are available without sign-up or payment.
No watermarks or branding are added to your final file.
Yes. Our site is optimized for mobile and tablet users.