Is Add Watermark private?

Everything runs locally in your browser. Your files are never uploaded to StackPDF servers.

Do I need an account to use Add Watermark?

No. StackPDF is free to use without signing up or creating an account.

Does Add Watermark work offline?

After the page and libraries load, processing happens on your device. A connection is only needed to load the app the first time.

Can I add a DRAFT or CONFIDENTIAL watermark?

Yes. Enter any text, then set opacity, size, rotation, and placement (including diagonal or tiled) so every page is marked consistently.

Is watermarking free for unlimited files?

Yes. No account, no daily watermark quota, and no upload size paywall — stamp as many PDFs as you need in the browser.

Does the watermark become part of the PDF?

Yes. The exported file includes the watermark baked into page content so recipients see it when they open or print the document.

Can I watermark only some pages?

Watermarks apply across the document for consistent branding or draft marking. For page-specific stamps, combine with Organize or Split first.

Can I watermark a photo instead of a PDF?

Yes — on StackImage. Stamp a text or image mark on the photo itself with [StackImage Watermark](https://stackimage.stacktools.studio/watermark-image), then bring it back here if you still need a PDF.

Add Watermark

Stamp text watermarks across pages.

How it works

1Upload a PDF.
2Configure watermark text, opacity, and position.
3Download the watermarked file.

About

Add diagonal or tiled text watermarks for drafts and branded PDFs. Adjust opacity, size, rotation, and position — processed only on your device.

FAQ

Need image tools?

Compress, convert, crop, and enhance photos in StackImage — the same privacy-first browser tools, no uploads.

Open StackImage

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