Add a Watermark to PDF — Text or Logo, Free & Private

Stamp text like "CONFIDENTIAL" or your logo on every page. Choose opacity, size, angle and position, or tile it across the page.

Local Processing — No PDF Upload Required

Now on iOS

Quick facts: Add Watermark

Price: Free, no limits
File upload: None. Files are processed in your browser
Account: Not required
Watermark: None
Input: PDF · PNG/JPG
Output: PDF
Works on: Windows, macOS, Linux, ChromeOS, iPhone, iPad, Android

Privacy Guaranteed

Unlike other tools, we do NOT upload your files to a server. All processing happens in your browser, so your bank statements and private IDs stay on your computer.

Text in any language or your own logo image.

Opacity, size, angle, nine positions or tiled, with a live preview.

No upload — the watermark is added in your browser.

How to Add Watermark

Select your PDF or drag it into the upload area. A preview of the first page appears.
Type your watermark text, or switch to Image and choose a PNG or JPG logo.
Adjust opacity, size, angle and position, or tick "Tile" to repeat it across the page.
Click "Add watermark" and download the watermarked PDF.

About Add Watermark

Mark Every Page as Yours

A watermark tells readers at a glance that a document is a draft, confidential, a sample or simply yours. Our free tool stamps a text or image watermark on every page of your PDF, and shows you a live preview before you save.

Text or Image

Text watermarks in any language, including Hebrew, Arabic, Chinese and Japanese, in five colors, regular or bold.
Image watermarks: use your logo or stamp as a PNG (transparency is kept) or JPG.

Full Control Over the Look

Opacity from faint to solid.
Size relative to the page width.
Angle: horizontal, diagonal or vertical.
Position: any of nine spots on the page, or tile the watermark across the whole page so it can't be cropped out.

Landscape and rotated pages get the watermark exactly where the preview shows it.

Private by Design

The watermark is added inside your browser with pdf-lib. Your document is never uploaded, there is no sign up, and nothing else on the page changes.

Frequently Asked Questions

QHow do I add a watermark to a PDF for free?

Open PDFMerger.io/add-watermark, select your PDF, type your text or choose a logo, adjust the look in the preview, and click "Add watermark". It is free, with no sign up and no extra branding.

QCan I use my logo as a watermark?

Yes. Switch to Image and choose a PNG or JPG. PNG transparency is preserved, so a logo with a transparent background looks clean on the page.

QDoes it work with Hebrew, Arabic, Chinese or Japanese text?

Yes. The text is drawn with your device's fonts, so any language your browser can show works as a watermark.

QCan I repeat the watermark across the whole page?

Yes. Tick "Tile" and the watermark is repeated in a staggered grid across every page, which makes it much harder to crop out.

QIs my PDF uploaded?

No. Everything happens in your browser, and your file never leaves your device.