Can someone undo or remove the black box after downloading?
No. The redaction boxes are rendered as solid graphical elements directly within the PDF vector stream, making them permanent.
Permanently black out and redact confidential information, SSNs, credit cards, or names from PDF documents with zero data recovery leaks.
100% Free & Private — Processed entirely inside your web browser without server uploads
🚀 Open ⬛ Redact PDF (Blackout)Here is an alarming fact: simply drawing a black rectangle using basic markup or highlighter tools on your computer does NOT protect your data! In many basic viewers, the black box is just a cosmetic shape — anyone who receives your PDF can copy-paste the underlying text or delete the shape to read your private numbers.
SmallPDF Pro’s Redact tool provides genuine visual and data redaction. You drag redaction boxes over confidential areas on any page thumbnail. When exported, the tool burns solid, opaque black boxes over the exact coordinates, permanently obscuring the underlying content in the final PDF.
And because SmallPDF Pro operates 100% client-side in your web browser, un-redacted confidential records never touch a cloud server.
Select or drag your PDF into the redaction tool.
Click and drag across page thumbnails to cover names, account numbers, or sensitive paragraphs.
Click "⬇️ Redact & Download". The file is permanently masked and downloaded immediately.
No. The redaction boxes are rendered as solid graphical elements directly within the PDF vector stream, making them permanent.
Yes! Use our "✏️ Interactive PDF Editor" tool, which includes an Eraser (whiteout) tool and direct text replacement.