deskutil

Converter tool

Add Watermark

Add a text or image PDF watermark in your browser, then download watermarked.pdf. Draw rotated text on every page, optionally stamp a PNG or JPG, and set opacity. Password-protected PDFs fail with a clear error. Nothing is uploaded.

This draws a visible overlay with pdf-lib. It does not encrypt the file. Work stays in the browser. Large files may be slow.

Choose one PDF or drop it here. Nothing is uploaded.

Text layout

No image chosen. Text is stamped on every page. Pick a PNG or JPG to stamp an image too.

File—
Pages—
Size—

Choose one PDF, keep or change the watermark text, optionally add an image, then add watermark. Files around 40 MB or many pages may be slow.

How to add a PDF watermark

Choose or drop one PDF. Keep the default text CONFIDENTIAL or type your own. Set opacity and choose tiled or centered layout. Optionally pick a PNG or JPG. Then Add watermark to download watermarked.pdf. Text is drawn rotated about 45 degrees on every page. An image is stamped too if you chose one. Password-protected files fail with an error. Nothing is sent to a server.

Frequently asked questions

Is my PDF uploaded to a server?

No. pdf-lib runs in your browser, watermarked.pdf is built locally, and Deskutil never receives the file, the watermark text, or the image.

How does Add Watermark stamp a PDF?

It draws your text on every page with pdf-lib, rotated about 45 degrees, either tiled or centered. Opacity applies to the stamp. If you choose a PNG or JPG, that image is stamped on every page as well.

What happens with a password-protected PDF?

Watermarking stops with a clear error. Remove the password in another app, then try again. The file is never uploaded.

Can I use both text and an image?

Yes. The text field defaults to CONFIDENTIAL. Leave it filled to draw a text PDF watermark, and optionally pick a PNG or JPG to stamp too. You need at least text or an image.

What file do I download?

A single PDF named watermarked.pdf. Every page has the watermark drawn on top. The original file on your device is unchanged. This is a visible overlay, not encryption.