How to Add a Watermark to a PDF Online

Need to mark a document as confidential, protect your work before sharing it, or brand a PDF before sending it to a client? Adding a watermark takes seconds — no software to install.

Why Add a Watermark to a PDF?

Watermarks are more useful than most people realise. Common reasons to add one:

• Mark sensitive documents as CONFIDENTIAL or DRAFT before sharing
• Protect proposals or creative work shared with clients before payment
• Brand documents with your company name before distribution
• Indicate document status — "FOR REVIEW", "NOT FOR DISTRIBUTION"
• Deter unauthorised copying or redistribution of your work

How DocKiit's Watermark Tool Works

DocKiit lets you add a custom text watermark to any PDF — with full control over the text, position, opacity, and font size. Everything is processed locally in your browser, so your files never get uploaded to a server or sent anywhere. You get the result instantly, with no queue and no wait.

How to Add a Watermark to a PDF on DocKiit

Step 1: Open the Watermark Tool

Head to DocKiit and select Watermark PDF from the homepage. This is a Pro feature — you'll need a DocKiit Pro account to access it.

Step 2: Upload Your PDF

Click Choose File or drag and drop your PDF onto the page. It loads instantly in your browser — no upload progress bar, no waiting.

Step 3: Customise Your Watermark

Set your watermark exactly how you want it:

• Text — type whatever you need, e.g. CONFIDENTIAL, DRAFT, your company name
• Position — choose where it appears, including diagonal centre for the classic watermark look
• Opacity — control how visible it is, from subtle to prominent
• Font size — adjust to suit the document

Step 4: Download Your Watermarked PDF

Hit Apply Watermark and your PDF downloads instantly with the watermark baked in across every page.

How to Add a Watermark to a PDF on Mac

Mac's Preview app doesn't have a built-in watermark feature. You can approximate one by adding a text annotation, but it won't appear as a true watermark across every page. For a proper watermark on Mac, a browser-based tool like DocKiit is the fastest option without paying for Adobe Acrobat.

How to Add a Watermark to a PDF on Windows

Windows has no native PDF watermark tool either. Adobe Acrobat Pro supports it but requires a subscription. Microsoft Word can add watermarks to Word documents before exporting to PDF, but for an existing PDF your quickest option is DocKiit — free to try, no install needed.

How to Add a Watermark to a PDF on iPhone or Android

Open your mobile browser, go to DocKiit, and follow the same steps. No app download needed — it works on any device with a modern browser.

Frequently Asked Questions

Will the watermark appear on every page?

Yes — DocKiit applies the watermark across all pages of the PDF automatically.

Can I remove a watermark once it's added?

Once a watermark is baked into a PDF it can't easily be removed without specialist software. Make sure you keep a copy of the original unwatermarked file before applying.

Can I add an image watermark like a logo?

DocKiit currently supports text watermarks. For logo or image watermarks you'd need a desktop tool like Adobe Acrobat.

Will the watermark affect the PDF quality?

No — DocKiit adds the watermark as a layer on top of the existing content without re-processing or compressing the file, so quality is fully preserved.

Is it safe to watermark confidential documents online?

With DocKiit, yes — your file never leaves your browser. That's especially relevant for watermarking, since the documents people most often want to watermark are the ones they least want to expose to third parties.

Can I control how visible the watermark is?

Yes — DocKiit lets you set the opacity anywhere from subtle to bold, so you can match the watermark to how the document will be used.