Stamp a text or logo watermark onto a PDF: choose position, opacity, rotation, and tiling, on every page or a page range. Everything happens in your browser; your PDF never leaves your device.

Stamping DRAFT across every page

A document is going to people who need to read it but should not treat it as final, or as theirs. The usual answer is a word laid diagonally across the page.

Add the PDF, set the text or pick a logo, and apply.

Now the thing this page will not pretend about. A watermark is not security. What gets added is page content, drawn on top of what is there. Anyone with a PDF editor can take it off, and that is true of every watermark tool.

What it is good for is signaling: it tells an honest reader that this is a draft, a review copy, or confidential. It does not stop a determined one. If the file needs restricting, you want a password, not a stamp.

Text or logo, and where it sits

A text watermark uses the fonts built into the PDF format itself: Helvetica, Helvetica Bold, Times Roman, Times Italic, and Courier. That keeps the file readable in any viewer, and it means custom typefaces are not available. You choose the wording, size, and color.

An image watermark stamps a PNG or JPEG logo, sized as a percentage of the page width. SVG is not supported.

Both share the same placement controls: center, any corner, or tiled in a repeating grid. Rotation gives the familiar diagonal. Opacity runs from faint to solid, and it decides whether the page underneath stays readable.

You can stamp every page, or switch Apply to over to Page range and type something like 1-3, 5, 8-10. A preview line spells out the instruction before you commit: which mark, how many pages, position, angle, and opacity.

What happens to the original

Your source file is not modified. The tool works on a copy in memory and returns a new PDF named after the original, with -watermarked appended.

Inside it, the pages are the originals with the mark drawn over them. Nothing is flattened into an image, so the text underneath stays selectable.

Document properties are cleared on the way out. Title, author, subject, keywords, and the source XMP metadata block do not carry into the copy. That matters when the copy is the version leaving your organization.

A password-protected PDF has to be unlocked first. An encrypted file cannot be read without its password, so the tool says so directly.

Nothing is uploaded

Not the PDF, and not the logo.

Both are read into your browser, and the watermarked file is assembled and downloaded there. Given what people usually watermark, that is the part worth being sure of.

The page loads one thing of its own. Adding a PDF fetches the pdf-lib library (about 511 KB) from noadstools.com, to read the page count and draw the mark. That is the only extra request, it comes from this site rather than a third-party CDN, and once it has loaded the stamping needs no network.

Open DevTools on the Network tab while you apply a mark: one library down, nothing of yours up.

There is no account, and no mark of ours on top of yours. The full source code is public on GitHub under the AGPL-3.0 license, and the privacy page gets this tool down to one library and one line.

Questions

Is there a free PDF watermark tool online that does not upload my file?

Yes. This one.

No signup, no page cap, and the only mark on the result is the one you set.

Can the watermark be removed by someone else?

Yes, by anyone with a PDF editor.

A watermark is ordinary page content, so an editor can select and delete it. No tool prevents that, including this one. Treat it as a label, not a lock.

How do I add a CONFIDENTIAL stamp to a PDF?

Leave the type on Text and type CONFIDENTIAL, which is already the default.

Choose Center or Tile, keep the rotation near 45 degrees, and set the opacity so the mark reads without burying the text.

Can I use my own logo as a watermark?

Yes, as a PNG or JPEG.

Switch the type to Image, choose the file, and set its width as a share of the page. The logo is embedded directly, so it stays sharp at any zoom.

SVG is not supported, so export your mark to PNG first.

Can I watermark only some of the pages?

Yes.

Under Apply to, choose Page range and type the pages you want, such as 1-3, 5, 8-10. Every other page is copied through unchanged.

Related tools

Merge PDF | combine PDF files in any order. Split PDF | extract pages or cut a PDF apart. Sign PDF | place a signature on a page. Image to PDF | turn images into a PDF.