Puppeteer vs wkhtmltopdf: A Complete Comparison

When it comes to converting HTML to PDF, two tools dominate the conversation: Puppeteer and wkhtmltopdf. But which one should you choose for your project?

Overview

wkhtmltopdf

wkhtmltopdf has been around since 2008 and uses the QtWebKit rendering engine. It's a command-line tool that's straightforward to use but shows its age in several areas.

Pros:

• Fast for simple documents
• Low memory footprint
• Standalone binary, no dependencies
• Mature and stable

Cons:

• Based on outdated WebKit (Qt 4.8)
• Poor CSS3 support
• No JavaScript rendering
• No longer actively maintained
• Limited modern HTML5 support

Puppeteer

Puppeteer is a Node.js library that provides a high-level API to control headless Chrome/Chromium. Released by Google in 2017, it represents the modern approach to PDF generation.

Pros:

• Uses latest Chromium engine
• Full CSS3/HTML5 support
• JavaScript execution
• Modern web features (Flexbox, Grid, etc.)
• Active development and community
• Excellent rendering accuracy

Cons:

• Higher memory usage
• Slower for simple documents
• Requires Node.js
• Larger deployment footprint

Feature Comparison

Performance Benchmarks

We ran tests converting a typical invoice document with both tools:

# Simple Invoice (1 page, minimal CSS)
wkhtmltopdf:  ~150ms
Puppeteer:    ~800ms

# Complex Invoice (3 pages, tables, custom fonts)
wkhtmltopdf:  ~300ms (with rendering issues)
Puppeteer:    ~1200ms (pixel-perfect)

# Memory Usage
wkhtmltopdf:  ~50MB
Puppeteer:    ~250MB

Real-World Use Cases

When to Use wkhtmltopdf

1. Simple Documents: Basic text-heavy documents without complex layouts
2. Legacy Systems: Already integrated and working
3. Resource Constraints: Very limited server resources
4. No Modern CSS: Only using basic HTML/CSS

When to Use Puppeteer

1. Complex Layouts: Modern CSS, grids, flexbox
2. Dynamic Content: JavaScript-rendered content
3. Custom Fonts: Web fonts and custom typography
4. Modern Web Apps: Converting React, Vue, or Angular apps
5. Pixel-Perfect Results: Need exact browser rendering

Migration Guide

If you're currently using wkhtmltopdf and considering a switch:

Before (wkhtmltopdf)

wkhtmltopdf \
  --page-size A4 \
  --margin-top 20mm \
  input.html output.pdf

After (Puppeteer)

const puppeteer = require('puppeteer');

const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto('file:///input.html');
await page.pdf({
  path: 'output.pdf',
  format: 'A4',
  margin: { top: '20mm' }
});
await browser.close();

Why SyntaxDoc Uses Puppeteer

At SyntaxDoc, we chose Puppeteer for several key reasons:

1. Modern Web Support: Our users rely on modern CSS and HTML5 features
2. Consistent Results: What you see in Chrome is what you get in the PDF
3. Future-Proof: Active development ensures compatibility with new web standards
4. Complex Layouts: Better handling of tables, grids, and responsive designs

Conclusion

While wkhtmltopdf served us well for years, Puppeteer is the clear choice for modern web applications. The improved rendering quality and support for modern web standards far outweigh the slightly higher resource usage.

If you're building a new project or can migrate, choose Puppeteer. If you need a managed solution that handles all the complexity, try SyntaxDoc.

Learn More

• SyntaxDoc Quickstart Guide
• API Reference
• Handling Complex Layouts