Watermark PDF
Add custom text watermarks to your PDF documents online for free. Customize opacity, angle, font, color, and positioning to protect intellectual property.
Stamp Custom Text Watermarks on PDF Documents Online
Distributing confidential pitch decks, pre-release book drafts, sample contracts, or proprietary training manuals? Adding a clear watermark—such as "CONFIDENTIAL", "DRAFT", "COPY", or your organization's name—deters unauthorized redistribution, clarifies document status, and establishes intellectual property ownership. Our Free Online PDF Watermark Tool lets you stamp custom watermarks over your PDF pages in seconds.
Configure watermark styling to match your exact workflow. Enter any custom text, adjust transparency opacity (from subtle 15% to prominent 75%), select colors (Red, Gray, Black, Blue), and choose angles (diagonal 45° across the page, horizontal, or vertical). The watermark is embedded directly into the visual stream of every page.
Enjoy fast cloud processing without watermark software or subscriptions. All document transfers use encrypted SSL pipelines, and temporary files are permanently destroyed within 60 minutes.
Type any custom phrase or use popular presets like "CONFIDENTIAL", "DRAFT", "SAMPLE", or "COPY".
Configure transparency from 15% to 75% and choose diagonal, horizontal, or vertical orientations.
Stamps watermarks securely into the document graphics so they appear in all viewers and printouts.
Zero subscriptions, no mandatory sign-ups, and automated file purging within 60 minutes.
How to Add a Watermark to a PDF Online
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1
Upload the PDF Select or drag your PDF document into the workspace above.
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2
Configure Watermark Text & Style Type your custom watermark text, select color, set opacity percentage, and choose orientation angle.
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Stamp and Download Click "Process Files" to apply the watermark and download your protected PDF file.
Frequently Asked Questions
Can a recipient easily remove the watermark?
The watermark is baked directly into the PDF content stream. Standard readers cannot strip it without advanced PDF editors.
Will the watermark cover up and obscure my document text?
You can configure the opacity slider to semi-transparent settings (such as 20% or 30%) so the underlying text and images remain easily readable.
Can I watermark PDFs on mobile devices?
Yes! The tool works smoothly in Safari and Chrome across iPhone, iPad, and Android without requiring dedicated app downloads.
Is this tool completely free?
Yes. Paperknife Solo does not charge fees, require accounts, or add promotional watermarks to your secured files.