Free PDF Annotator
Annotate a PDF online free
Highlight, comment, and draw directly on a PDF's pages. Use the tool below, mark up as many pages as you need, then download the annotated file.
Browser-based PDF markup
Open a PDF, then highlight, comment, and draw directly on the pages. Nothing is applied to your file until you save it.
Your files are handled safely
✔ Processing happens in your browser
✔ Your file is never uploaded to a server
✔ Your files are not stored or saved anywhere
✔ No account or sign-up required
Why Use It
Common reasons people annotate a PDF
Reviewing documents
Highlight key passages and leave comments for someone else to read.
Marking up drawings or forms
Draw directly on a page to point something out or sketch a change.
Study notes
Highlight and annotate a reading without printing it first.
Honest Limits
Visual markup, page by page
Markup is applied per page, and comments are baked in as small text boxes on the page rather than as PDF native comments you can toggle on and off in Acrobat. This keeps the tool simple and means the markup shows up correctly in any PDF viewer.
FAQ
PDF Annotator questions
What kinds of markup can I add?
Three tools: a highlighter you drag over an area, sticky-note style text comments you place with a click, and freehand drawing for circling or sketching directly on the page.
Can I mark up more than one page?
Yes. Use the page navigator to move between pages — your markup on each page is kept, and everything is applied together when you save.
Can I remove or undo a markup I added?
Yes. Undo removes the last thing you added to the current page, Clear page removes everything on it, and clicking a comment removes just that comment.
Is my file uploaded to a server?
No. Rendering and saving both happen entirely in your browser. Your PDF is never uploaded to a server, and nothing is stored.