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Add a watermark to a PDF

Stamp text such as CONFIDENTIAL, or your logo, on the pages of a PDF — in one spot or tiled, over the content or behind it. Text in any language works. It all happens in your browser, so your file never leaves your device.

No watermarkFree, no sign-upRuns in your browserAccepts .pdf, plus .png or .jpg for logos
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Quick answer

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

Open Mergevanta's Add watermark tool, choose your PDF and pick Text or Image. Type your words or choose a PNG or JPG logo, set the size, opacity and angle, then pick a spot or Tile across the page. Press Add watermark to download it — free, with no sign-up and no branding of its own.

Price
Free
Watermark
None
Sign-up
Not required
Accepts
.pdf, plus .png or .jpg for logos
You get
A watermarked .pdf
Processing
In your browser — files never leave your device
Files stored
Never
Works on
Windows, macOS, Linux, iPhone, iPad and Android

Updated

What you get

Why use Mergevanta to add a watermark to a PDF

Text in any language

Latin text is added as real PDF text. Hindi, Arabic, Chinese and emoji are drawn by your browser and added as a sharp image, so every script looks right.

Your logo or stamp

Use a PNG with a transparent background or a JPG, sized as a share of the page width and faded to the opacity you want.

Over or behind content

Put the watermark on top of everything, or underneath the text and pictures so the page stays easy to read.

Private by design

The watermark is added in your browser. Neither the PDF nor your logo is uploaded, and nothing is stored.

Step by step

How to add a watermark to a PDF with Mergevanta

  1. 1

    Press Choose PDF and pick the file you want to watermark.

  2. 2

    Choose Text and type your words, or choose Image and pick a PNG or JPG.

  3. 3

    Set the Font, Size, Color, Rotation and Opacity — the preview shows the watermark on your page.

  4. 4

    Under Placement, tap a Position or turn on Tile across the page, then choose Over the content or Behind the content and which Pages.

  5. 5

    Press Add watermark, then Download the watermarked PDF.

FAQ

Add watermark questions

No. Mergevanta adds the watermark in your browser, so the PDF and your logo never leave your device and nothing is stored. There's no size limit beyond your device's memory, and it works in phone browsers too.

Yes. The standard PDF fonts only cover Latin characters, so other scripts and emoji are drawn by your browser — which shapes every script properly — and added as a high-resolution image of the text. It looks like text but can't be selected or searched.

Over the content draws the watermark on top of everything on the page. Behind the content puts it underneath the text and pictures, which keeps pages easier to read — but a page with a solid white background, such as a scan or many slides, hides it completely.

Yes. Positions and angles are measured on the page as you see it, so a 45° watermark rises from bottom left to top right on every page, including pages saved sideways.

Yes. Choose Page range under Pages and type the pages, for example 1-3, 8. The preview tells you when the page shown isn't in your range.

The watermark becomes part of each page's content, so PDF viewers can't switch it off — keep your original if you need a clean copy. A watermark labels a document but doesn't lock it; use Protect PDF to add a password.

Yes, if you know its password: the tool asks for it and uses it only in your browser tab. The watermarked copy is saved without a password, so protect it again if it needs one.

Keep going

Other tools in the studio

Protect PDF

Add a password that's needed to open your PDF, and choose whether people can print, copy or edit it.

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Add page numbers

Number the pages of any PDF in the corner you choose, in formats like “Page 3 of 12”.

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Sign PDF

Draw, type or upload your signature, then place it — with your initials, the date and your name — on any page of a PDF.

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