All-in-one PDF annotation toolkit – from
quick notes to detailed markups.
Secure, Compliant, and Professional PDF Software - Award-Winning.
PDFelement has won G2 Best Software Awards 2024 - Top 50 Office Products, received ISO 27001-Information Security Management certification, and is a recognized member of the PDF Association.



The best PDF annotator for everyone.
How to annotate & markup PDFs in 3 easy steps?
FAQs about PDF highlighter app.
Adding notes to a PDF is simple with PDFelement:
- Open your PDF in PDFelement.
- Go to the Comment tab on the top menu.
- Select Note and click anywhere on the page to place it.
- Type your note in the box that appears.
- Save the file to keep your annotations.
PDF annotation means adding extra information to a PDF without changing the original text. This can include highlights, underlines, sticky notes, shapes, stamps, or drawings. It’s useful for study, collaboration, or reviews.
With PDFelement, you can annotate PDF documents easily on desktop or online, using tools like comments, sticker libraries, and measurement features.
When working with PDFs, it’s important to know whether you need to edit the content or simply annotate it.
- Edit PDF means changing the original content, such as rewriting text, replacing images, or rearranging pages.
- Annotate PDF means adding extra notes without altering the original file, such as highlights, sticky notes, stamps, or shapes.
With PDFelement, you can do both—edit PDFs like a Word file and annotate with professional tools for collaboration and review.
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Fast, easy, and affordable PDF editor. Convert, edit, sign PDFs, and more.
Education
Annotating student papers and research is faster with PDFelement. I highlight, comment, and even use sticker libraries to mark progress, making feedback fun, clear, and easy to understand.
- Laura, University Lecturer
IT Service
We review technical manuals daily, and PDFelement’s annotation tools save hours. Adding callouts, highlights, and stamps helps our team collaborate clearly without endless email threads.
- David, IT Service Manager
Healthcare
PDFelement makes reviewing medical reports easier. I use sticky notes for doctor comments and highlights for critical data, ensuring patient records remain accurate and securely annotated.
- Dr. Mehta, Clinical Data Specialist