Three straightforward steps
- Choose or paste the input requested by this tool.
- Configure the options and run the operation locally.
- Review and download or copy the result.
PDF TOOL
Watermark PDF
Apply a custom text watermark across selected or all PDF pages with adjustable opacity and angle.
ON-DEVICESelected input is processed in this browser.
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The selected input stays under your control
On-device processing means the input is handled by browser APIs on the device running this page. Closing or refreshing the page normally clears the active in-memory working session.
Read the Privacy Policy →Apply a text watermark across PDF pages
Stamp selected pages with controlled text, angle, size and transparency.
How to use it
- Choose a PDF and enter concise watermark text.
- Set pages, angle, size and opacity.
- Create the watermarked copy and inspect readability.
Supported input
- Readable PDF documents
- Latin text supported by the built-in Helvetica font
Worked example
Apply a translucent “DRAFT” mark diagonally across every page of a proposal.
Limitations
- A watermark is not access control and can sometimes be removed by PDF software.
- Existing digital signatures may become invalid.
Troubleshooting
- Lower opacity if underlying text becomes difficult to read.
- Shorten the watermark or reduce font size on narrow pages.
Tool-specific questions
Can I watermark selected pages?
Yes. Leave the page field blank for all pages or enter a list and ranges.
Does this encrypt the document?
No. A watermark is a visible label, not security protection.
Before you process
Can I use this watermark pdf online without uploading my input?
Yes. This tool is labelled On-device, so the selected input is processed in your browser and is not sent to a ForgeMyFile processing API.
What happens if the browser cannot process it?
The tool shows a readable error and stops. It does not silently fall back to a cloud upload.
Why can performance differ between devices?
The browser is doing the work locally, so speed and practical file size depend on available memory, CPU and browser capabilities.