Protect PDF — flatten and stamp (not an Adobe password)
Files & ImagesFlatten pages to images and stamp a label. This is not an Adobe owner-password.
Calculated Result
Flattens pages to images and stamps a label. Not an Adobe owner-password.
Formula: Rasterize + stamp. pdf-lib cannot write Standard Security encryption.
About this calculator
pdf-lib cannot emit a real PDF password. Use this to drop a live text layer and mark CONFIDENTIAL, or use a desktop editor for encryption.
How It Works & Formula
FormulaFlatten + stamp; not Adobe Standard Security encryption
Rasterize each page, embed JPEG, draw a diagonal stamp.
Frequently Asked Questions
Will this add a password I can type to open the file?
No. pdf-lib in this stack cannot write Standard Security. Pages are flattened to images and stamped. Use Acrobat or qpdf if you need a real owner password.
Can someone still copy the text?
The live text layer is replaced with a JPEG of the page, so copy-paste of the original glyphs usually fails. It is still not DRM.