PDF Watermark

📱 Core Highlight: Mobile Parameter Tuning Tune every watermark parameter in real-time from your phone — no config file editing, no guessing. Adjust, preview, export.

Convert PPT/PPTX to PDF and add custom watermarks with live mobile preview. 将 PPT/PPTX 转为 PDF，支持手机实时调参加水印。

Mobile Parameter Tuning / 手机实时调参

Tune every watermark parameter in real-time from your phone — scan QR code, adjust sliders, preview instantly, copy JSON config.

👉 See live demo GIF & mobile UI screenshots: GitHub README

Three Watermark Modes / 三种水印模式

• 🔹 Diagonal (default) — classic 45° rotated watermark, repeated diagonally across the page. Best for "CONFIDENTIAL" stamps.
• 🔹 Grid — uniform grid of watermark text (e.g. 3×5), no rotation. Best for "INTERNAL USE" patterns.
• 🔹 Center — single large watermark centered on the page. Best for "DRAFT" / "APPROVED" stamps.

👉 See effect screenshots: GitHub README

Quick Start / 快速开始

# One-liner: PPTX → watermarked PDF
python3 {baseDir}/scripts/pptx_to_pdf_watermark.py input.pptx output.pdf

# With custom config
python3 {baseDir}/scripts/pptx_to_pdf_watermark.py input.pdf output.pdf config.json

Features / 功能

• 📱 Mobile parameter tuning — live preview on phone, copy JSON, done
• 📐 3 layout modes — diagonal / grid / center
• 🎨 Full customization — text, size, opacity, rotation, color
• 🌍 Cross-platform — auto-detects CJK fonts (macOS/Linux/Windows)
• 📦 PPTX support — one step from PPTX to watermarked PDF
• 🔒 Local & safe — no network, no credentials, input never modified

Configuration / 配置

{
  "text": "CONFIDENTIAL",
  "fontSize": 60,
  "opacity": 0.15,
  "rotation": 45,
  "color": [0.5, 0.5, 0.5],
  "pattern": "diagonal",
  "repeatX": 3,
  "repeatY": 3
}

All parameters optional — sensible defaults provided.

Dependencies / 依赖

• LibreOffice (PPTX→PDF): brew install --cask libreoffice (macOS) / apt install libreoffice (Linux)
• Python 3: pip3 install PyPDF2 reportlab

Principles

• Non-destructive — input file is never modified
• Cross-platform — auto-detects OS-appropriate fonts
• No network required — all processing is local
• No credentials — no API keys, nothing to leak

License

MIT-0 (No attribution required)