Add Watermark to PDF

Stamp a text watermark such as CONFIDENTIAL, DRAFT or your company name diagonally across every page of a PDF. The PDF is processed locally.

Your file never leaves your device.

How to convert PDF to PDF

Type your watermark text and it is drawn diagonally in semi-transparent grey on each page, so the content remains readable while every copy is clearly marked. Useful for drafts, confidential documents, samples and proofs.

Step 1: Choose your PDF file
Drag and drop a .pdf file onto the converter or click to browse. It works on desktop, tablet and phone.
Step 2: Type the watermark
Enter the text to stamp, for example CONFIDENTIAL.
Step 3: Download the PDF
Save each result individually, or download everything as a single ZIP when you convert several files.

Good to know

Latin characters are supported by the built-in font; keep the text short for the best look.

Why use this PDF to PDF converter?

Protect drafts and confidential documents.
Semi-transparent, readable result.
No upload, no account.

Is it free?

Yes. Add Watermark to PDF is free, with no watermark, signup or email required. Local conversions have no artificial file-size or daily cap; the practical limit is your device.

Is my file uploaded?

The PDF file is processed entirely in your browser. It is never uploaded, never stored and never seen by anyone, so this is safe for confidential files.

More ways to work with a PDF

PDF editor →

About the formats

What is PDF?

PDF (Portable Document Format) reproduces a document exactly as it was laid out, regardless of the device, operating system or software used to view it. It is the standard choice for sharing, printing and archiving documents whose appearance must not change. Text-based PDFs can be converted to Markdown, plain text or HTML here.

Use PDF whenever the layout matters more than editing, reports, invoices, contracts, résumés and anything you need to share or print so it looks identical everywhere. Choose PDF when recipients should see exactly what you saw, with no fonts or margins shifting.

PDF (Portable Document Format)

Frequently Asked Questions

Is add watermark to pdf free?

Yes. It is free, with no watermark, signup or email required. Local conversions have no artificial file-size or daily cap; the practical limit is your device.

Is it safe to watermark a pdf here?

Yes. The work happens on your own device with WebAssembly and browser APIs, so the file is not uploaded at all. You can even disconnect from the internet once the page has loaded.

Do I need to install anything?

No. Everything runs in a modern browser (Chrome, Edge, Firefox or Safari) on Windows, macOS, Linux, Android and iOS. There is no app, plugin or account.

PDFProcessed locally