PDF Watermark
Use PDF Watermark
All GotoKit tools run directly online, no download required.
About this tool
Add custom text watermarks to your PDFs with full control over font size, color, opacity, rotation, and 9-position placement. Tile mode for repeating watermarks across every page.
- Keeps original layout, tables and images
- Works on scanned documents — OCR friendly
- PDFs stay on your device, processed locally
- Free, no watermark, no usage limits
Compared with common PDF workflows
| Aspect | This tool | Typical alternative |
|---|---|---|
| Time to start | Open the page and start | Often needs installation or import |
| Lightweight tasks | Faster for conversion, compression, merging | More settings, but heavier workflow |
| Privacy | Prioritizes local or lightweight web flow | Depends on app and sync settings |
Docs
Add custom text watermarks to your PDF files with full control over font size, color, opacity, rotation, and 9-point positioning — all processed server-side for permanent, embedded watermarks.
This tool uses the PyMuPDF rendering engine to embed watermarks directly into your PDF pages. Unlike client-side overlay approaches, server-rendered watermarks are a permanent part of the document and are not easily removed.
Core Features
- Custom Watermark Text: Any text content — English, Chinese, numbers, symbols
- Adjustable Font Size: From 8px to 150px
- Color Picker: Any HEX color
- Opacity Control: 5% to 100%, from subtle to prominent
- Rotation Angle: 0° to 360° free rotation, diagonal 45° is a common choice
- 9-Point Positioning: Top-left, top-center, top-right, middle-left, center, middle-right, bottom-left, bottom-center, bottom-right
- Tile Mode: Repeat watermark text across the entire page with adjustable spacing
- All Pages: Watermark is automatically applied to every page of the PDF
How to Use
- Upload your PDF by dragging and dropping or clicking the upload area (max 30MB)
- Enter your watermark text
- Adjust font size, color, opacity, and rotation
- Choose a 9-point position or enable tile mode
- Click “Add Watermark & Download”
- Download the watermarked PDF once processing completes
Use Cases
- Copyright protection for ebooks, reports, and proposals
- Document classification with labels like “CONFIDENTIAL”, “INTERNAL ONLY”, “DRAFT”
- Brand promotion by embedding company names or URLs on outgoing documents
- Anti-fraud verification with unique watermark identifiers
- Educational materials with school or teacher watermarks
Notes
- File size limit: 30MB per file
- Uploaded files are temporarily stored and auto-deleted after processing
- Latin text always renders perfectly; CJK text depends on available server fonts
- Tile mode is ideal for full-page coverage but may increase file size with dense text
- Watermarks are permanently embedded — they cannot be removed afterward
Last verified: 2026-07-20 Tech stack: PyMuPDF (fitz) + Python Flask Reference: tool.browser.qq.com/pdf_watermark.html
FAQ
Is this tool free?
Yes, completely free. No signup, no limits.
Does it support Chinese text?
Yes, if CJK fonts are available on the server. Latin characters always work perfectly.
Will the watermark appear on every page?
Yes, the watermark is applied to all pages. Tile mode repeats the text across each page.
Are files saved?
No. Files are auto-deleted after processing.
What file size is supported?
Up to 30MB per file.
How can I process a scanned PDF without obvious quality loss?
Start with the original scan, avoid repeated recompression, and enable any image- or OCR-friendly mode when available. After processing, preview text edges, tables, and image detail before exporting the final PDF.
Is this tool suitable for preparing PDF files for email attachments?
Yes. Email-ready PDFs usually need the right balance of file size, compatibility, and loading speed. Compress or convert first, then confirm fonts, margins, images, and page count still look correct.
What is the difference between this online PDF tool and desktop software?
Online tools are usually faster for one-off tasks and lightweight workflows because there is nothing to install. Desktop software is stronger for batch automation, complex layouts, and enterprise pipelines. For quick conversion, compression, merging, and export, online is usually the fastest path.
Do I need to sign up, download, or install anything?
Most Gotokit tools are designed to open directly in the browser without a separate install. If a tool has a quota, browser requirement, or third-party dependency, the page copy will state that clearly.
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