A watermark tells the world a document is yours, marks its status, or warns against unauthorized use — all at a glance. Our Add Watermark tool lets you stamp custom text or an image across every page, with control over position, size, rotation, and transparency. Because it runs entirely in your browser, you can brand confidential drafts and proprietary files without ever uploading them.
or click to browse. Processing happens 100% in your browser.
🔒 Your file stays on your device. We never see it.
Drop the document you want to watermark onto the tool. It opens instantly with no upload step.
Type watermark text like 'CONFIDENTIAL' or 'DRAFT', or upload your logo to brand the document visually.
Set the font size, color, and rotation — a diagonal watermark is the classic choice for a clear, tamper-evident look.
Dial in the opacity so the watermark is clearly visible yet still lets the underlying text and images read through.
Center the mark, tile it across the page, or place it in a corner, applied consistently to every page at once.
Save your watermarked PDF instantly. The mark is embedded into the file, so it travels with the document everywhere it goes.
Stamp custom text such as 'CONFIDENTIAL' or overlay your company logo, giving you both status labels and full brand watermarking in one tool.
Adjust font, size, color, and rotation to create anything from a subtle footer credit to a bold diagonal warning across the page.
Fine-tune opacity so your mark is unmistakable without obscuring the document's content, striking the right balance every time.
Your watermark is stamped uniformly across the whole document in a single pass, so no page is left unmarked.
Watermarking runs locally in your browser, so proprietary and confidential files are branded without ever being uploaded.
Watermark as many documents as you like with no caps, no sign-up, and no watermark from us added to your output.
Unmarked draft • Risk of misuse • No branding
Clear watermark • Protected • Branded
| Types | Text or image (PNG/JPG) |
|---|---|
| Opacity | 10-100% adjustable |
| Method | WebAssembly overlay |
| Processing Method | WebAssembly (WASM) |
| Browser Memory | < 512MB allocated |
| Supported PDF Versions | 1.4 through 2.0 |
| Output Quality | Lossless / 300 DPI |
| Feature | PDFDocStudio | Cloud Competitors |
|---|---|---|
| File Uploads | ❌ Never | ✅ Required |
| Account Needed | ❌ No | ✅ Often |
| HIPAA Friendly | ✅ Yes | ⚠️ BAA Required |
| Max File Size | 50MB | Varies |
| Price | Free | Freemium |
A watermark is a semi-transparent text or image layer placed over every page of a document. It communicates status and ownership at a glance — ‘DRAFT’, ‘CONFIDENTIAL’, or a company name — without obscuring the content beneath. Because the mark repeats on each page, it travels with the file wherever it goes, discouraging unauthorised reuse and making the document's purpose immediately clear.
Effective watermarks balance visibility with readability. A mark that is too dark competes with the text; one that is too faint fails to register. Adjusting opacity, angle, size, and position lets you find the sweet spot where the watermark is plainly present yet the underlying document remains easy to read. Diagonal text across the page is a classic choice because it is hard to crop out and instantly recognisable.
Watermarks serve both practical and legal purposes. Marking a document ‘DRAFT’ prevents an unfinished version from being mistaken for the final one, while a ‘CONFIDENTIAL’ stamp reminds recipients to handle it with care and creates a visible record of ownership should the file ever surface where it should not. Because the mark repeats on every page, it cannot be quietly removed by deleting a single sheet. PDFDocStudio applies watermarks entirely within your browser, so even sensitive material stays private, and the finished file carries your mark permanently wherever it is forwarded, printed, or archived.
Watermarks protect, brand, and communicate status. Here is when they are worth adding.
A good watermark is noticed but never in the way. These tips help you strike that balance.
Watermarking should protect your work without compromising your privacy. Here is why this tool fits the bill.
Mark sensitive files locally, so your proprietary documents are never uploaded just to add a watermark.
Text or image, any color, size, angle, and opacity — craft exactly the mark your document needs.
Every page gets the same treatment automatically, giving your document a uniform, professional look.
Unlimited watermarking with no accounts and no branding of ours forced onto your files.
Yes. You can upload an image such as a company logo and overlay it across every page. For the cleanest result, use a transparent PNG so only the logo appears without a background box.
Yes. Opacity is fully adjustable, so you can make the mark bold and prominent or subtle enough to sit quietly behind your content while remaining visible.
Yes. Your chosen text or image is stamped uniformly across all pages in a single operation, so the entire document is consistently marked.
No. Watermarking runs entirely in your browser, so your file never leaves your device — ideal for confidential and proprietary documents.
The mark is embedded into the page content, making casual removal difficult. It is a strong visual deterrent, though no visible watermark is completely tamper-proof.
Not if you set an appropriate opacity. The goal is a mark that is clearly visible while still letting the underlying content read through, which you control.
No. We never add our own watermark or branding — the only mark on the document is the one you choose.
Yes. You can center it, place it in a corner, or angle it diagonally across the page to suit your document.
Yes. The tool runs in mobile browsers, so you can watermark documents from a phone or tablet.
100% free. 100% private. 100% in your browser.
Add a Watermark Now