Manual Document Blackout

Draw as many black boxes as you need over a scan, contract or screenshot.

Redaction & masking Client-side Canvas / content-stream editing

Tool preview

How to use it

! Boxes cover pixels only; if the source is a PDF, export the page as an image first.
! There is no undo stack beyond clearing all boxes.

Why black boxes instead of blur?

Solid black is irreversible; blur and mosaic can sometimes be attacked.

Can I move a box after drawing it?

Not yet; clear and redraw if a box is misplaced.

Is this a true PDF redaction?

No. For PDFs, use the PDF redaction tool, which removes the text layer as well.

Processing happens in your browser using the File API, WebAssembly and Web Workers. There is no upload endpoint.

Add a use-case, date and recipient watermark to an ID document.

Stamp a purpose and date watermark onto a photocopy.

Lay both sides onto one A4 page, ready to print.