Add Watermark to PDF PDF Tools
Need to protect a PDF with a watermark? Whether you want to mark a document as Confidential, brand it with your company logo, or simply add a Draft label before sharing, you have come to the right place.
With AFFLIGO, you can add professional text or image watermarks to any PDF in under two minutes. No software to install, no account to create, and most importantly, your files never leave your browser. Everything happens locally on your device.
We built this tool because we have dealt with the same problem. You have a sensitive contract or a draft report that needs a quick watermark before sending it out. The last thing you want is to upload it to some random website and wonder where your file ends up. That is why we made it completely private and dead simple to use.
Quick tip from our team: For watermarks that are genuinely hard to remove, place them over text or images and set opacity to around 20%. If someone tries to erase it with a PDF editor, they will damage the actual content underneath. Want more techniques? Check out our complete guide to PDF watermarking.
Why Professionals Trust AFFLIGO for PDF Watermarking
There is no shortage of tools that claim to watermark PDFs. But when you are handling contracts, legal briefs, or unpublished research, you need more than a basic overlay. You need precision, privacy, and results you can trust.
Here is what sets AFFLIGO apart.
Your Files Never Leave Your Device
We use WebAssembly (Wasm) to run the entire watermarking process inside your browser. That means your PDF is never uploaded to a server, never stored in a cloud, and never seen by anyone but you. For lawyers, doctors, researchers, and business owners handling sensitive material, that is not just convenient. It is non-negotiable.
Vector-Sharp Results Without the Bloat
Most free watermarking tools convert your PDF into a flat image, stamp the watermark on top, and re-save the whole thing. The result? Blurry text, broken searchability, and a file that is somehow three times larger.
We do it differently. Our vector-injection engine adds watermarks as a clean, transparent layer directly on top of your existing content. Your text stays selectable. Your images stay sharp. And your file size barely changes.
Text or Image – Your Choice
Need a quick Confidential stamp? Type it in, pick your font and size, and place it anywhere on the page. Want to use your company logo? Upload a PNG or JPG, position it precisely, and adjust opacity until it looks just right. For the cleanest look, we recommend a transparent PNG – it avoids that awkward white box around your logo.
Watermark Specific Pages Only
Not every page needs a watermark. Maybe you only want it on the cover page. Or perhaps pages 5 through 10 are still in draft while the rest is final. Our page range selector lets you choose exactly which pages get the watermark and which stay clean. No all-or-nothing approach here.
Full Control Over Appearance
Opacity, rotation, font, size, color, position – you control every aspect. Want a subtle diagonal watermark at 15% opacity across the entire page? Done. Need a bold red DRAFT label centered at the top? Easy. Our pixel-precise positioning lets you place watermarks exactly where you want them.
Once your documents are watermarked, you might also want to add page numbers for professional pagination, protect your PDF with a password for an extra security layer, or compress the file to make it easier to email – all with the same privacy-first, browser-based approach.
How to Add a Watermark to Your PDF in 3 Simple Steps
Step 1: Upload Your PDF
Drag and drop your file into the upload area above, or click to browse your computer. Need to watermark a whole folder? You can process multiple PDFs at once for batch efficiency. No registration, no email required.
Step 2: Choose and Customize Your Watermark
Select text watermark or upload your logo image. Adjust opacity, rotation, font, size, and position. Use the page range selector if you only want the watermark on specific pages. Preview in real-time to see exactly how it will look.
Step 3: Download Your Protected PDF
Happy with the preview? Click download and your watermarked PDF is ready to go. The entire process takes under two minutes, and your original file remains untouched.
Who Uses This Tool and Why
Legal professionals use it to mark discovery documents, contracts, and drafts as Confidential or Attorney-Client Privileged before sharing with opposing counsel.
Business owners brand proposals, invoices, and whitepapers with their company logo to reinforce brand identity and prevent unauthorized distribution.
Academic researchers label preprints and working papers as Draft or Under Review to prevent premature citation or plagiarism.
Designers and agencies watermark mockups and concept presentations before client approval, protecting their creative work from being used without payment.
Students add their name and student ID as a watermark to essays and projects to deter plagiarism and establish ownership.
Frequently Asked Questions
No, it won’t. Our engine adds watermarks as a lightweight vector layer. Your file size stays almost the same, and there’s no noticeable difference in how fast it opens or scrolls.
Absolutely. You can upload your logo (PNG or JPG) and position it anywhere on the page. For the cleanest result, use a transparent PNG – that way you avoid a white background covering your document.
You can choose a page range. Want it on just the cover page? Or only on pages 5-10? Our tool lets you pick exactly which pages get the watermark – perfect for marking some sections as 'draft' while keeping others clean.
When you upload a file to most online tools, it sits on a server somewhere. With our tool, everything happens locally – your file never leaves your device. That’s essential for contracts, legal documents, or any sensitive information.
Place it over text or important elements, and set the opacity low (around 20%). That way, if someone tries to erase it with a PDF editor, they’ll damage the actual content underneath. It’s a simple but effective deterrent.
Ready to Protect Your PDFs?
Stop worrying about where your sensitive files end up. AFFLIGO gives you a fast, free, and completely private way to add professional watermarks to any PDF.
Upload your first file above and see the difference in under two minutes. No account needed. No quality loss. No privacy concerns. Just clean, secure watermarking that works every time.