PDF Editor – Add Annotations
Add text, stamps, and rectangle highlights to PDF pages. All processing is in-browser.
About PDF Editor
Add text annotations, watermark stamps, and colored rectangle overlays to PDF files entirely in your browser. No files are sent to any server.
Use Add Text to insert notes or labels at specific coordinates. Use Add Stamp to overlay DRAFT, CONFIDENTIAL, APPROVED, COPY, or VOID stamps diagonally across a page. Use Rectangle to draw colored highlight boxes.
Coordinates are in PDF points (1 point = 1/72 inch). For an A4 page, width is ~595pt and height is ~842pt.
Can I see a preview before downloading?
The annotation list shows all pending annotations. A full canvas preview requires a PDF renderer — download to review in your PDF viewer.
What coordinate system is used?
PDF coordinates: X is from the left edge, Y is from the top of the page in this tool (converted internally to PDF's bottom-origin system).
Is my PDF private?
Yes. No files are uploaded. All processing happens locally in your browser.