Add Watermark Privately
Add Watermark privately with ContinuePDF, where your PDF is processed entirely inside your own browser and never uploaded. For sensitive documents — contracts, medical records, tax forms, IDs — the safest tool is one that physically cannot see your file. Because the watermark step runs locally, there is no server copy to leak, subpoena, or breach.
Start Add Watermark NowHow to Add Watermark Privately
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Open the tool (optionally go offline)
Load Add Watermark once. You can even disconnect from the internet afterwards — it still works.
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Add your PDF locally
Your file is read into the browser tab on your device. It is not transmitted anywhere.
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Download and close the tab
Save watermarked PDF. Closing the tab clears the file from memory — no trace is left behind.
What you can do with Add Watermark
Adding a watermark stamps text or an image — a status label like CONFIDENTIAL or DRAFT, or a logo — across your PDF pages to mark the document's status or ownership, without hiding the content.
Mark a draft
Stamp DRAFT or NOT FINAL across pages so an in-progress document is not mistaken for the final version.
Label confidential files
Add CONFIDENTIAL so readers immediately know how to handle the document.
Brand your documents
Place a company logo or name on each page of proposals and reports.
Protect shared work
Watermark portfolios or samples with your name so they cannot be passed off as someone else's.
How ContinuePDF keeps Add Watermark private
Most online PDF tools follow the same pattern: your file is uploaded to a server, processed there, and a link to the result is sent back. That means a copy of your document sits on someone else's computer, at least temporarily — and you have to trust their retention policy, their staff, and their security. For confidential material, that is a real risk.
ContinuePDF uses client-side processing instead. The code that performs the watermark operation is downloaded to your browser and runs there, on your machine. Your PDF stays in local memory for the seconds it takes to produce watermarked PDF, then vanishes when you close the tab. We never receive the file, so there is nothing on our side to expose.
Why choose ContinuePDF
Never uploaded
Your document stays on your device from start to finish.
No server copy
Nothing to retain, leak, or hand over — we never hold your file.
Works offline
Once loaded, the tool runs with the network disconnected.
Auto-cleared
Closing the tab wipes the file from memory automatically.
Pro tip
Keep watermarks semi-transparent and positioned so they do not sit over important text — a light diagonal stamp reads clearly without making the document hard to use. A subtle grey often looks more professional than a bold colour.
Frequently asked questions
Can I use my own logo as a watermark?
Yes. You can add an image watermark such as a logo, as well as custom text, and adjust its size, position, and transparency.
Will the watermark appear on every page?
You can apply it across all pages for consistent marking, which is the usual choice for status labels and branding.
Is it safe to watermark confidential PDFs here?
Yes — arguably safer than most alternatives. Because your PDF is processed in your browser and never uploaded, there is no server-side copy of your confidential document. You can even run the tool with your internet disconnected once the page has loaded.
Can ContinuePDF staff see my document?
No. The file never reaches us. All watermark processing happens locally on your device, so we have no access to your document's contents at any point.
Is ContinuePDF free to use?
Yes. ContinuePDF and all of its tools, including Add Watermark, are free with no signup required. Because documents are processed in your browser rather than on our servers, we can offer the full feature set at no cost.
Other ways to Add Watermark
Prefer a different device, browser, or setup? Add Watermark works the same everywhere.
Ready to Add Watermark?
Start using our free watermark tool now — no signup required.
Open Add Watermark Tool