PDF Watermark
/pdf-watermarkAdd a diagonal text watermark to every page of a PDF with adjustable opacity. All in your browser.
Marking a document as confidential before sharing it is good practice, but watermarking is often locked behind paid tools. This watermarker stamps text across every page diagonally, with opacity you can tune from a subtle ghost to a clear mark. It is ideal for drafts, legal copies, and presentations. The watermark is rendered locally on your device.
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FAQ
Frequently asked questions
Everything you need to know about pdf watermark.
What text can I use as a watermark?
Anything you type, such as "CONFIDENTIAL", "DRAFT", or your company name. The text is drawn diagonally and scaled to roughly a fifth of the page's smallest dimension so it stays prominent without obscuring content.
Can I control how visible the watermark is?
An opacity slider from 5 to 80 percent lets you dial the strength from a subtle ghost to a clearly visible mark. The preview updates live so you can settle on the right level before downloading.
Is the watermark applied to every page?
Yes. The tool watermarks all pages in the document in one pass, which is ideal for stamping an entire file as confidential. It also works when the PDF contains many pages, not just the first.
Is my PDF processed privately?
Yes. The watermark is rendered locally with pdf-lib and never leaves your device. Your file and the watermarked output both stay in your browser, so no server ever sees the document.
Does the watermark become part of the file?
No. The watermark is drawn as an overlay on top of each page when the new PDF is generated, leaving the original page content unchanged underneath and preserved in the output.
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