Private PDF tool
Watermark PDF
Add a centered diagonal text watermark to every page in one PDF. The document is processed locally in your browser and downloads as a new PDF.
File
No file selected yet.About browser PDF watermarking
This tool reads the selected PDF with pdf-lib, embeds Helvetica, draws your watermark text across every page, and saves a new PDF locally. Your file is not uploaded or stored by a server.
Watermark PDF is for simple visible text marks such as CONFIDENTIAL or DRAFT. It does not remove existing watermarks, edit page text, or provide password protection.
Does this upload my files?
No. Everything on this page runs locally in your browser, so your files are never uploaded to a server. Close the tab and nothing is left behind. It even keeps working if you go offline after the page loads.
This is true for every tool on this site. Curious how that works? Read how browser-side processing works.
FAQ
Are PDFs uploaded for watermarking?
No. The PDF is read in your browser, the watermark is drawn locally, and the result downloads from your device.
What kind of watermark is added?
The tool draws a large diagonal text watermark centered on every page in gray with partial transparency.
Can I remove an existing watermark?
No. This tool adds a new text watermark. It does not detect or remove existing artwork, text, or stamps.
Can password-protected PDFs be watermarked?
No. Password-protected or encrypted PDFs are refused because the browser cannot safely read their pages without a password flow.