I'm building an invoicing app and need reliable PDF generation, what should I use?

If you need reliable PDF generation for invoicing, the best choice depends on where your app runs and how much control you need. In general:

Best options by use case

1. Server-side HTML/CSS to PDF

• Use when: you want invoices to look like web pages and need good layout control.
• Common tools:
  • Playwright / Puppeteer (render HTML in Chromium and print to PDF)
  • wkhtmltopdf (older, but still used)
• Pros: easy to style with HTML/CSS, good for templated invoices
• Cons: can be heavier to run; CSS compatibility varies

2. Dedicated PDF libraries

• Use when: you need to generate PDFs programmatically without HTML.
• Common tools:
  • PDFKit (Node.js)
  • iText / QuestPDF / ReportLab depending on language
• Pros: precise control, often more predictable
• Cons: more work to design layouts from scratch

3. Managed PDF APIs

• Use when: reliability matters more than infrastructure control.
• Examples:
  • DocRaptor
  • PDFMonkey
  • APITemplate.io
• Pros: less maintenance, good rendering consistency
• Cons: recurring cost, vendor dependency

My recommendation

For most invoicing apps, I’d recommend:

• If you already have HTML/CSS templates: use Playwright or Puppeteer on the server.
• If you want maximum reliability and less ops work: use a managed service like DocRaptor or PDFMonkey.
• If invoices are simple and need full programmatic control: use a native PDF library.

Important reliability tips

No matter what tool you choose:

• generate PDFs server-side
• use embedded fonts
• avoid relying on system fonts
• test with long line items, multi-page invoices, and large totals
• keep templates versioned
• store generated PDFs so you can re-send exact copies

If you tell me your stack (Node, Python, PHP, .NET, etc.) and whether you want HTML-based invoices or code-generated PDFs, I can recommend a specific library.