Add a "CONFIDENTIAL" watermark to a PDF
Stamp CONFIDENTIAL diagonally across every page of a PDF before sharing. Adjustable opacity and angle. Browser-based, no upload.
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Add a "CONFIDENTIAL" watermark to a PDF
Marking a document CONFIDENTIAL before you send it signals that the contents are restricted and should not be forwarded or copied — common practice for contracts, financial statements, HR files and anything sensitive. This page is pre-set with the word CONFIDENTIAL as a diagonal watermark across every page, so you can apply it in one step; you can still adjust the opacity and angle, or change the wording if you prefer "PRIVATE" or "INTERNAL ONLY". The stamp is saved into the file as text over your content, so it appears in every viewer and on every printout, and it is semi-transparent so the document underneath stays readable. It applies to all pages automatically. Like the rest of the tool, it runs entirely in your browser, so the file is never uploaded — which is itself the right behaviour for a document you are marking confidential. It is free, has no signup, and adds no extra watermark of its own.
Frequently asked questions
- Is the CONFIDENTIAL text pre-filled?
- Yes. This page starts with CONFIDENTIAL as a diagonal watermark. You can change the wording or its opacity and angle.
- Does marking it confidential keep the file private?
- The stamp is a visible notice. Privacy also comes from processing: the file is watermarked in your browser and never uploaded.