Add a Watermark to Any PDF — Free, No Account

PDF Stamper lets you add a watermark to a PDF online free, right in your browser — type any text like DRAFT, CONFIDENTIAL, or your name, and it is stamped across every page. Set the opacity, color, font size, and position, then download the stamped copy. There is no account and no sign up, and nothing is uploaded: your document is stamped entirely on your own device.

Add your PDF above, type the watermark text, and open Advanced settings to set the opacity, color, size, and position. The stamp is added to every page — download the stamped copy when it looks right.

How to Add a Watermark to a PDF Online

Adding a watermark — sometimes called a stamp — runs entirely in your browser tab, so nothing is sent to a server. It takes three short steps:

1. Open capsuletools.app/pdf-stamper/ and choose your PDF (up to 50 MB)
2. Type the watermark text — for example DRAFT, CONFIDENTIAL, a name, or an email address (up to 100 characters)
3. Open Advanced settings to set the opacity, font size, color, and position, watching the live preview of page one update as you go
4. Tap Download stamped PDF to save the watermarked copy ([filename]-stamped.pdf)

The watermark is drawn straight into the PDF as real text — the document's original pages, text, and fonts are left exactly as they were. You get a clean copy with the stamp added, and your original file is untouched.

Choose Your Stamp: Text, Position, and Style

Everything about the stamp is adjustable, so it can be a faint background watermark or a bold, solid label:

• Opacity — slide from faint to fully solid. A low opacity keeps the text underneath readable, which is what you want for a background watermark.
• Font size — make the stamp small and discreet or large enough to span the page.
• Color — pick any color with the color picker. Grey or red reads as a classic watermark; black works for a plain stamp.
• Position — choose diagonal (the classic across-the-page watermark), center, top-right, or bottom-right.

Because the page-one preview updates live, you can dial in a pdf watermark online free exactly how you want it before you download a single file.

Common Watermark Types: DRAFT, CONFIDENTIAL, VOID, and More

A text watermark is just a label, so you can stamp a PDF with whatever your document needs. Common ones include:

• DRAFT — to add a draft watermark to a PDF while a document is still being reviewed.
• CONFIDENTIAL — to add a confidential watermark to a PDF before sharing sensitive information.
• VOID, COPY, or SAMPLE — to mark a document's status at a glance.
• Your name or email — to brand or trace a file you are sending out, similar to a rubber stamp.

Type any of these as the stamp text, pick the diagonal preset, and lower the opacity for the familiar watermark look.

Works on Mac, iPhone, iPad, and Android — No App Needed

PDF Stamper is a web page, so it works on any device with a modern browser. On a Mac, open it in Safari or Chrome and pick your PDF from Finder — a free alternative to Preview or Acrobat for watermarking. On iPhone or iPad, open it in Safari and choose the file from Files or iCloud. It works the same way on Android. There is no app to install and no account to create.

You can even add it to your home screen as an installable app, so watermarking a PDF is one tap away. It works offline after the first visit.

Add a Watermark to Every Page at Once

You only type the stamp text once. PDF Stamper applies it to every page of the document automatically — whether it is a one-page form or a hundred-page report. The preview shows page one so you can check the placement, and the same stamp is written onto every other page when you download. There is no need to repeat the watermark page by page.

Use the free PDF watermark tool →