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Free PDF Watermark Tool – Add Watermark to PDF Online
Add text or image watermarks to PDF files online for free. Protect and brand your PDF documents.
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How to Use Add Watermark to PDF
Upload Your PDF
Upload the PDF you want to watermark.
Add Watermark
Type your watermark text or upload a logo. Set position, opacity, and size.
Apply & Download
Click Apply Watermark and download your protected PDF instantly.
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Add Professional Watermarks to PDF Documents
Helperzy PDF Watermark Tool lets you add text watermarks (Confidential, Draft, Sample, your company name) or image watermarks (logo) to any PDF. Customize position (center, diagonal, corner), opacity, font size, and color. Perfect for protecting sensitive documents, branding reports, or marking draft versions. No Adobe Acrobat needed, no signup, completely free.
Frequently Asked Questions – Add Watermark to PDF
Upload your PDF to Helperzy PDF Watermark Tool, type your watermark text or upload a logo, customize the settings, and click Apply. Download your watermarked PDF instantly.
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Professional standards, zero cost.
Helperzy is built for everyone — developers, students, and professionals who need fast, reliable tools without the friction.
Always Private
Browser-based tools run 100% on your device. Your files are never uploaded, never seen by us, never stored anywhere.
Edge Optimised
Processes are distributed across global edge nodes for minimum latency. Server-side files auto-deleted in 60 minutes.
Always Free
Every tool is free forever. No account, no credit card, no email required. Open a tool and start in seconds.
Works Everywhere
No software to install. All browser-based tools use modern Web APIs — fast, offline-capable, and always available.
Common Questions
Absolutely. For all browser-based tools your files never leave your device — processing happens entirely in your browser. For server-side tools like PDF to Word, files are encrypted in transit, processed in isolated memory, and permanently deleted within 60 minutes.
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Get in touch
Have a tool request, found a bug, or want to report a security concern? We read every message and typically reply within 24 hours.
- Tool requests & feature ideas
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- Security concerns or responsible disclosure
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Your message is sent securely over HTTPS. We never share your contact details with third parties.
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