Add Watermark to PDF Online — Free & Private
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Supports: PDF
Privacy-First PDF Tools
FAQ
Can I customize the watermark appearance?
You can set text up to 100 characters, opacity from 0.1 to 1.0, font size from 10 to 200, color, and either 45° diagonal or horizontal orientation. Position is not adjustable. WinAnsi-compatible watermark text remains selectable and searchable. Other Unicode is rendered locally as PNG with browser fonts; rasterized marks are images, and rare glyphs should be checked visually.
Is the watermark added to all pages?
Yes. The watermark is applied consistently to every page in your document.
Can I add image watermarks?
This tool supports text watermarks only; it does not add image watermarks.
Can the watermark be removed after applying?
WinAnsi-compatible marks are added as PDF text; other Unicode becomes a PNG image. A capable PDF editor may remove either overlay. Keep the original because the downloaded copy is newly written.
What is the best opacity for watermarks?
There is no universal best value. Choose 0.1–1.0 and inspect every page so the mark is visible without hiding important content.