Free online annotate PDF tool
Add in comments and notes, highlight key sections, and mark up your PDFs in seconds, with no download required.
Working with industry leaders
We’re a proud partner of these globally recognized brands:
What is a PDF annotation tool?
PDF annotation tool lets you add notes, highlights, comments, shapes, and drawings directly onto a PDF. QuillBot’s annotate PDF tool makes reviewing documents faster and easier for students, teams, and professionals who need clean, clear markup without any complicated software.
How to use annotate PDF in files online
Upload your files
Drag and drop your PDF file that you'd like to add annotations.
Preview and adjust
Highlight text, add comments, draw shapes, or mark important sections.
Download your PDF
Save your fully annotated file and share it with classmates, teams, or colleagues.
Why choose QuillBot’s annotate PDF tool?
QuillBot makes document review effortless by giving you a simple, distraction-free workspace for marking up your files. Everything happens online—no apps, no installs, no hassle.
Add comments and notes instantly
Write feedback, reminders, and annotations in your PDF in seconds.
100% online, No installation needed
Access powerful annotation tools from your device's web browser.
Highlight and underline important text
Make important information stand out easily for quick referencing.
Draw, mark, and sign PDFs
Use freehand tools for custom shapes, sketches, or signatures.
Benefits of QuillBot’s annotate PDF
Quick and easy annotation: Edit your PDF with intuitive, user-friendly tools.
Better collaboration: Share marked-up documents with teams for clear communication.
Clean organization: Keep related notes, highlights, and comments all in one place.
Faster review: Speed up reading, studying, grading, or team workflows.
Who can use QuillBot’s annotate PDF
Students and educators
Add notes, highlight study materials, and provide feedback.
Researchers
Annotate academic papers, reports, and reference documents.
Business professionals
Mark up contracts, proposals, and presentations.
Why writers love us
Annotate PDF FAQs
Can I highlight and add comments to a PDF?
Yes, you can use this tool to highlight text, add comments, underline, and more for your PDF files.
Is QuillBot’s annotate PDF free to use?
Yes, QuillBot’s annotate PDF tool is completely free and works directly in your browser. It doesn’t require any sort a subscription or sign-up to be used.
Can I draw or mark on a PDF?
Yes, You can draw, circle, underline, and leave handwritten-style notes on PDFs with this tool.
Can I use the QuillBot’s annotate PDF tool on mobile devices?
Yes. Because it is used through a web browser, QuillBot’s annotate PDF tool is usable across all types of devices including mobile devices.
Can I edit or remove annotations after adding them?
Yes, annotations can be moved, edited, or deleted before downloading your PDF after you’ve already added them.
Do I need to install software to annotate a PDF?
No. Because QuillBot’s annotate PDF toolis browser-based, no software download is required to use it.
Will annotations change the original content of my PDF?
No, annotations are added on top of the PDF without altering the original text or layout of it.
What are appropriate ways to use the Annotate PDF?
Please ensure your use of Annotate PDF tool complies with our Copyright Policy Community Guidelines Academic Integrity Page