PDF Watermark & Page Numberer
Add custom text watermarks, stamp confidential overlays, and insert page numbers to PDF documents. 100% Client-Side local browser processing.
Drag & Drop PDF file to add watermark
Upload single PDF up to 100MB. 100% Private local processing.
Text Watermark Settings
Live Stamp Preview
How do I use PDF Watermark & Page Numberer?
Upload or drag & drop your PDF file.
Configure watermark text, opacity, rotation angle, or page numbers.
Click Apply Watermark and download your updated PDF document.
What features does PDF Watermark & Page Numberer offer?
100% Private local browser PDF processing (pdf-lib)
Custom text overlay, angle, opacity, and colors
Page numbering (Page X of Y) in multiple positions
Frequently Asked Questions about PDF Watermark & Page Numberer
Are my PDF documents uploaded to an external server?
No. All PDF page parsing and watermark rendering occur 100% locally inside your web browser.
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How do I use PDF Watermark & Page Numbering?
Upload your PDF document using the drop zone above.
Type your watermark text (e.g. 'CONFIDENTIAL', 'DRAFT', or company name).
Adjust font size, color, opacity (10% to 100%), and rotation angle (-90° to +90°).
Optionally enable 'Page X of Y' footer numbering and choose alignment position.
Click 'Apply Watermark & Generate PDF' and download your stamped document.
What features does PDF Watermark & Page Numbering offer?
Precision vector text stamping: Custom typography, colors, font sizes, and rotation angles (-90° to +90°)
Granular opacity & alpha blending control (10% subtle background to 100% solid foreground overlay)
Automated dynamic 'Page X of Y' pagination for bottom-center, bottom-right, or top-right margins
Lossless stream injection: Preserves original vector text clarity, bookmarks, and internal hyperlinks
Interactive live parameter configuration with instant visual layout feedback
100% private in-browser client execution powered by pdf-lib WebAssembly — zero server uploads
Frequently Asked Questions about PDF Watermark & Page Numbering
How does the watermark layer interact with existing text and images in the PDF?
JoyTools injects the watermark directly into the PDF graphics state using standard vector drawing operators. By adjusting alpha opacity (e.g., 15%–25%), the watermark overlays the page seamlessly without obscuring underlying typography, tables, or high-resolution diagrams.
What opacity and angle are recommended for 'CONFIDENTIAL' or 'DRAFT' stamps?
For legal and corporate documents, a 45-degree diagonal rotation with 18%–25% opacity and a bold font (48pt–64pt) provides optimal deterrence. It traverses the primary reading area without hindering the readability of contract clauses.
How does the dynamic 'Page X of Y' page numbering feature work?
JoyTools reads the document's total page count and stamps a sequential footer ('Page 1 of 12', etc.) at your specified placement (bottom-center, bottom-right, or top-right) with clean typography, ensuring compliant legal and academic pagination.
Will adding a watermark flatten or rasterize my original vector PDF?
No. Unlike low-end tools that convert PDF pages into blurry JPEG images before stamping, JoyTools writes native PDF vector text objects directly into the document stream. All original selectable text, font glyphs, and clickable hyperlinks remain 100% intact.
Can I watermark large multi-page reports or eBooks?
Yes. Because pdf-lib operates directly on byte buffers inside browser memory, documents spanning dozens or hundreds of pages are processed and stamped in seconds without browser freezing or memory exhaustion.
Is my proprietary contract or intellectual property protected during watermarking?
Yes, completely. All stamping operations run client-side inside your browser sandbox. Not a single byte of your confidential agreements, blueprints, or medical records is ever uploaded to external cloud servers.
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