Free PDF Watermark Tool
Add professional text watermarks, CONFIDENTIAL stamps, dates, names or custom messages to your PDFs — completely private, 100% in-browser.
Add Watermark to PDF
Watermark Settings
Why Use Our Free PDF Watermark Tool?
Adding watermarks to PDFs is one of the most common ways to protect sensitive documents, indicate document status, or assert ownership. Whether you're sharing contracts, reports, invoices, academic papers, photos, or creative work, a visible watermark helps prevent unauthorized use while maintaining professionalism.
Traditional solutions like Adobe Acrobat are expensive, while many online tools upload your files to servers — raising serious privacy concerns. Our tool changes that: it runs entirely in your browser using modern JavaScript, never sends your documents anywhere, and is completely free with no limits.
Common Use Cases
- Mark business proposals, contracts & NDAs as CONFIDENTIAL or DRAFT
- Add approval stamps, reviewer names, or dates to official documents
- Protect intellectual property in portfolios, designs & creative PDFs
- Indicate version control (v1.0, Final, Archived)
- Brand marketing materials, ebooks, or whitepapers with your logo text
- Secure internal company documents before sharing
Benefits of Browser-Based Watermarking
- Maximum Privacy — Files never leave your computer
- Instant & Unlimited — No registration, no file size limits
- Batch Processing — Watermark dozens of PDFs at once
- Customizable — Change text, size, color, opacity
- Works Everywhere — Desktop, tablet, mobile — no software needed
Professionals in law, finance, education, marketing, and creative industries use this tool daily to secure documents quickly and safely. Try it now — your PDFs stay yours.
Frequently Asked Questions
Is my PDF data safe with this tool?
Yes — 100%. Everything runs locally in your browser using PDF-Lib. No file is ever uploaded to any server.
Can I really watermark multiple PDFs at the same time?
Absolutely. Add as many files as you want — the same watermark settings are applied to every document.
What can I use as watermark text?
Anything: "CONFIDENTIAL", "DRAFT", your name, company name, date, version number, "SAMPLE", "APPROVED", etc. Diagonal placement gives the most professional look.
Does the tool change the original PDF quality?
No. Text, images, fonts, layout — everything stays exactly the same. Only the watermark layer is added.
Can I make the watermark very light / almost invisible?
Yes — adjust the opacity slider (recommended range: 0.08–0.25 for subtle protection).
Will this work on my phone or tablet?
Yes — the interface is fully responsive and works well on mobile devices.
Can I add an image/logo as watermark?
Current version focuses on fast, lightweight text watermarks. For image-based watermarks, professional desktop software is recommended.