📄 PDF Compressor

pdfpressor is a Node.js library for compressing PDF files using rasterization and JPEG compression. It intelligently detects image-heavy PDFs and applies lossy compression using pdf-lib, sharp, and pdf-to-img.

📦 Installation

npm install pdfpressor

✨ Features

• Detects image-heavy PDFs using a simple heuristic.
• Rasterizes pages and compresses them as JPEGs.
• Preserves text/vector PDFs with minimal changes.
• Configurable DPI and JPEG quality.
• Optional forced rasterization.

🚀 Usage

const { compressPdf } = require('pdfpressor');

compressPdf('input.pdf', 'output.pdf', 150, 70)
  .then(stats => {
    console.log('Compression stats:', stats);
  })
  .catch(err => {
    console.error('Compression failed:', err);
  });

Parameters

• input (string) – Path to the source PDF file.
• output (string) – Path to the output compressed PDF.
• dpi (number, optional) – DPI for rasterization (default: 150).
• quality (number, optional) – JPEG quality (default: 70).
• force (boolean, optional) – Force rasterization even if not image-heavy.

📊 Example Output

📄 Input has 10 pages (5,200 KB)
🖼 Rasterizing with JPEG compression
→ Processing page 1/10
...
✅ Compressed -> output.pdf
Original: 5,200,000 bytes | Compressed: 1,800,000 bytes | Reduction: 65.4%