How to Watermark a PDF Online Free (Text & Logo Stamps)
Stamp custom text (CONFIDENTIAL, DRAFT) or image logos onto PDF pages. Control opacity, rotation angle, position, and tiling in your browser.
Open Watermark PDF — free, in your browser
Why apply a watermark to a PDF?
Watermarking protects intellectual property, signals document confidentiality (such as DRAFT, COPY, or INTERNAL USE ONLY), and prevents unauthorized redistribution. For freelancers and agencies, stamping a semi-transparent brand logo across sample drafts ensures clients preview the work without using it prior to payment.
Step-by-step: stamping text or logos on PDF pages
Open the free PDF watermarker · Remove background from logo first
- Open the Watermark PDF tool and upload your document.
- Choose between Text Watermark (type custom text) or Image Watermark (upload your PNG logo).
- Set the opacity slider (typically 20% to 35% so underlying text remains easily readable).
- Select the angle (diagonal 45° across the page or horizontal 0°).
- Choose whether to watermark all pages, odd pages, or a specific range.
- Download your watermarked PDF immediately.
Best practices for watermark visibility and readability
A watermark should deter copying without obscuring critical data. Use high-contrast diagonal placement for confidential stamps, or small bottom-corner placements for subtle branding. Keep opacity under 30% when underlying text is dense.
Compare two PDF revisions for changes · Protect PDF with password
Private client-side processing
Your documents and logos are rendered and stamped entirely in browser memory. No files are transmitted across the internet or stored on external servers.