Annotate PDF Online — Add Notes and Highlights
Annotate PDF Online Free — Add Notes | f2file
Mark up any PDF with highlights, text notes, and annotations right in your browser. Great for reviewing documents, studying, or giving feedback on drafts. No software download required — just upload and start annotating.
How it works
Upload the PDF
Open the document you want to review, proofread, or mark for someone else.
Add highlights and comments
Use highlights, drawings, notes, and marks to point out exact sections that need attention.
Download the annotated PDF
Save a review copy and open it once to confirm every note appears on the right page.
Frequently asked questions
About Annotate PDF
Annotate PDF is for review, not rewriting. Use it when you need to highlight a clause, circle a mistake, leave a comment for a teammate, mark a chart, or send feedback without changing the source document. Annotations are useful for contracts, drafts, invoices, class notes, research papers, design proofs, and reports. They keep the original page visible while making your feedback obvious. For final document changes, use PDF Editor or convert the PDF to Word. Good annotations are specific. Highlight only the sentence that matters, put comments close to the problem, and avoid covering signatures, totals, or reference numbers unless you are intentionally marking them.
Updated June 2026: Expanded the guide for review workflows, highlighting, comments, drawing notes, client feedback, and exporting clean annotated copies.