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.
- 100% free with no usage limits
- No sign-up or login required
- Runs right in your browser
- Privacy-friendly and fast to use
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.
More from PDF Convert
All PDF Convert toolsPDF to Word Converter
Convert PDFs to editable Word documents while preserving paragraphs, tables, and images, and also export Office files to PDF.
PDF Compressor
Reduce PDF file size with adjustable compression levels while keeping text readable and images usable.
PDF Encrypt and Decrypt
Protect PDFs with AES-256 passwords or remove password protection from files you are allowed to unlock.
Image to PDF Converter
Turn JPG, PNG, WebP, BMP, and GIF images into one PDF with drag-to-reorder, fit modes, page size, and margins.
PDF Merger
Combine multiple PDF files into one document, reorder them visually, and export a merged PDF with a custom filename.
PDF Splitter
Select the PDF pages you want to keep, remove the rest, and export a clean new PDF with page-grid controls.
PDF to Image Converter
Convert every page in a PDF to high-resolution PNG or JPG images with thumbnail preview, ZIP download, and DPI controls.