Draw, highlight, add boxes and stamps on any PDF page. Download a flattened copy with annotations baked in. 100% local — no uploads.
PDFZero lets you add highlights, freehand drawings, text boxes, stamps, and notes to a PDF, then download a flattened copy with all annotations baked into the page. Everything runs locally in your browser, with no upload or signup.
Annotating a PDF is useful for reviewing a contract, leaving feedback on a draft, marking up a diagram, or highlighting key passages in a document — without needing separate review software.
Highlights, freehand drawings, text boxes, stamps, and notes are all supported.
Flattening merges your annotations permanently into the page content, so they display correctly in any PDF viewer rather than relying on that viewer supporting separate annotation layers.
No, all annotation tools run locally in your browser.
Yes, you can undo or delete individual annotations before finalizing and downloading the document.
Yes, free to use with no signup required.