PDF Watermark Stamper
Stamp text watermarks (DRAFT, CONFIDENTIAL, custom) onto PDF pages with custom opacity, size, rotation, color, and position. Free and 100% in-browser — no upload.
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What is PDF Watermark Stamper?
PDF Watermark Stamper is a free in-browser tool that stamps text watermarks — DRAFT, CONFIDENTIAL, FINAL, SAMPLE, or your own label — onto PDF pages with full control over position, opacity, size, rotation, and color. Everything is processed locally with pdf-lib, so confidential documents never leave your device.
Key Benefits
- Stamp drafts and internal documents before sharing to deter unauthorized reuse
- 100% private: the PDF is processed in your browser and never uploaded
- Professional results with precise opacity, rotation, and position control
- Long text auto-shrinks to fit the page width — no clipped watermarks
- Free and unlimited with no sign-up and no page-count restrictions
Common Use Cases
- •Marking contract drafts as DRAFT before circulating for review
- •Stamping CONFIDENTIAL on HR, legal, or financial documents
- •Labelling SAMPLE across product mockups and catalog pages
- •Adding a review or approval mark to only the first page of a report
- •Branding handouts with a subtle diagonal team or project name
How to Watermark a PDF
- Upload your PDF: Drag and drop your PDF into the drop zone — or click to browse. The file opens locally in your browser and is never uploaded.
- Choose the stamp text: Type a custom label or click a preset: DRAFT, CONFIDENTIAL, FINAL, or SAMPLE. Standard PDF fonts cover Latin letters, digits, and basic punctuation.
- Adjust the style: Pick one of 9 positions, then set opacity, font size, rotation angle, and color. The live preview shows roughly where the mark will land.
- Stamp and download: Choose all pages or first page only, click the stamp button, and the watermarked PDF downloads instantly.
Key Features
- Diagonal or horizontal text stamps with angle control from -90° to 90°
- 9 anchor positions from corners to center with smart edge padding
- Adjustable opacity 10-100% so body text stays readable under the mark
- Auto-shrink keeps long stamps inside the page width — never clipped
- Apply to every page or first page only, with a live preview
Frequently Asked Questions
Is it safe to watermark confidential PDFs here?
Yes. The entire process runs in your browser using pdf-lib — your PDF is never uploaded to any server. Close the tab and nothing remains.
Can I use Thai or other non-Latin text for the watermark?
Not with this tool. The built-in standard PDF fonts only support Latin scripts, so Thai, Arabic, Chinese, and similar scripts cannot be stamped. Use English text like DRAFT or CONFIDENTIAL instead.
Will the watermark appear on every page?
By default yes — all pages get the stamp. Switch the scope to first page only if you want a cover-page mark.
Can the stamp be removed later?
Once saved, the watermark is part of the page content like any other text, so it cannot be toggled off. Keep an unstamped original if you may need a clean copy later.
Featured in Collections:PDF & Document Processing Suite