How to Add a CONFIDENTIAL Watermark to a PDF (Free)
Mark PDFs as CONFIDENTIAL before sharing. Add a professional-looking diagonal watermark in seconds — free, no account, no upload.
Adding a CONFIDENTIAL watermark to a PDF is standard practice for documents shared outside your organisation. FixMyPDF applies it to all pages in seconds, free, with your file never leaving your device.
Steps
Go to fixmypdf.in/tools/watermark-pdf. Upload. Enter "CONFIDENTIAL" as watermark text. Choose diagonal orientation, red or grey colour, 30% opacity. Apply to all pages. Download.
Best Settings for CONFIDENTIAL
Diagonal centre placement: most professional and hardest to crop out. Colour: grey (professional), red (urgent attention). Opacity: 25–35% — visible but not obstructing content. Font: bold, large (48–72pt for A4 pages).
Personalised Confidential Marks
For sensitive documents sent to specific recipients, customise the watermark with the recipient's name: "CONFIDENTIAL — John Smith". If the document leaks, the watermark identifies the source copy.
Legal Weight
A CONFIDENTIAL watermark signals the document's status and creates a record that confidentiality was communicated. It does not prevent copying but provides evidence that the recipient was informed of the confidential nature.
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