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Drop a PDF to annotate
Highlight, comment, underline, draw — then save with annotations baked in.
A PDF annotator lets you add notes, highlights, drawings, stamps, and text comments directly onto a PDF without altering the original content. Annotations are saved as a standard layer in the PDF file, so they appear in any PDF viewer — Adobe Acrobat, Apple Preview, Chrome, or any mobile reader — without requiring the annotator software to be installed.
Annotation is the primary way professionals review, mark up, and collaborate on PDF documents. A legal team marks up a contract with comments on specific clauses. A teacher circles errors on a student's work. An editor highlights passages to cut or expand. EditPDF AI's annotator runs entirely in the browser — your document never leaves your device.
Common ways people use this tool in real documents and day-to-day workflows.
Highlight key passages, add margin notes, and bookmark important pages in textbooks, papers, and research articles.
Mark up reports, proposals, contracts, and design briefs with comments and corrections before returning them to the author.
Add written feedback, circle errors, and highlight strong sections on student assignments submitted as PDFs.
Annotate PDF mockups and proofs with specific change requests, sticky notes, and freehand drawings for revision rounds.
Open the PDF you want to annotate. It loads directly in the browser-based editor.
Highlight text, add sticky notes, draw freehand, insert text boxes, or use shapes. All tools are in the toolbar.
Click Save. The annotations are embedded in the PDF and will appear in any PDF viewer, including Adobe Reader.