PDF tools
Add watermark to PDF
Stamp text or a light image across pages.
Run Add watermark to PDF online
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Adding a watermark to a PDF serves several important purposes: asserting ownership of proprietary content, marking draft documents as unofficial copies, protecting sensitive internal reports from unauthorised redistribution, and branding shared documents with a company logo or name.
This tool lets you add a diagonal text watermark (such as 'CONFIDENTIAL', 'DRAFT', 'SAMPLE', or a custom label) to every page of a PDF. The watermark is rendered as a semi-transparent overlay so the underlying content remains readable, and is applied to all pages uniformly — including any pages that already contain images or dense text.
Legal firms, financial institutions, and educational institutions use watermarks to identify document versions and restrict unauthorised copying. Freelancers and designers use 'SAMPLE' watermarks to share work-in-progress with clients while protecting final deliverables behind a paywall or contract.
How to use this utility
- Use the controls below—paste text, pick files, or adjust options as described on the tool.
- Click the main action button. Processing runs in your browser on this device.
- Download or copy the output. Check the processing note for any external services used by this operation.
Common use cases
- Marking a shared proposal or quotation with 'DRAFT' until the client signs off.
- Adding a 'CONFIDENTIAL' stamp to internal financial reports before distributing them to board members.
- Watermarking design previews or portfolio PDFs with 'SAMPLE — Konnect2Tools' before client review.
- Branding white-label reports with a company name as a watermark.
- Adding a 'NOT FOR DISTRIBUTION' warning to advance-copy research papers.
Tips for best results
- 1Use a short, capitalised watermark text (under 20 characters) for maximum readability at the diagonal angle.
- 2Reduce the watermark opacity to 20–30% for light backgrounds, and 40–50% for dark-background PDF pages.
- 3Place watermarks before sharing proofs — once shared without one, you cannot retroactively watermark copies the recipient has already saved.
- 4For branding (not security), consider adding a header/footer logo instead of a watermark, using the Edit PDF tool.
- 5If you need to remove your own watermark from a document later, process the original source file rather than the watermarked copy.
Frequently asked questions
- Is Konnect2Tools free?
- Yes. These in-browser tools are completely free to use with no account required for core functionality.
- Do my files leave my device?
- Browser document operations run locally, except where the operation uses an external service, such as AI summarisation. Read the processing note before using sensitive inputs.
- Is the Add watermark to PDF tool safe to use?
- Local operations process document content on your device. External-service operations may send inputs as described in the processing note. Keep originals and inspect the output.
- Can I add a logo image as a watermark instead of text?
- The current tool supports text-based watermarks. For image or logo watermarks, use the Edit PDF tool to place an image overlay on each page.
- Can I control the position and size of the watermark?
- The tool applies a centred diagonal watermark by default. Font size and opacity are configurable in the options panel.
- Will the watermark prevent printing of the PDF?
- No — watermarks are visible content, not security restrictions. A determined user can still print or copy the document. For true access control, use the Protect PDF tool to add encryption alongside the watermark.
- Does adding a watermark increase the file size significantly?
- The size increase is minimal — typically less than 5% — since the watermark is stored as a text rendering instruction rather than an embedded image.
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