I'm building a SaaS product with PDF merge and split features, what should I use?

For a SaaS PDF merge/split feature, the best choice depends on whether you want fast time-to-market or full control/self-hosting. In most cases, I’d recommend:

Best default: Python + pikepdf / qpdf

• pikepdf (Python wrapper around qpdf) is a strong choice for:
  • merging PDFs
  • splitting PDFs
  • preserving quality
  • handling encrypted/corrupt PDFs better than many basic libraries
• Good if your backend can be Python.

Good alternatives

If you want a very reliable low-level engine:

• qpdf directly
  • excellent for merge/split/rewrite operations
  • battle-tested
  • great for server-side processing

If you’re in Node.js:

• pdf-lib
  • decent for merge/split and PDF generation
  • simple API
  • good for moderate needs
• But for heavy-duty or tricky PDFs, I’d still prefer qpdf/pikepdf underneath.

If you want commercial SDKs:

• Apryse (PDFTron)
• PSPDFKit
• Adobe PDF Services These are great if you want:
• high reliability
• advanced features
• less infrastructure pain
• support/compliance But they cost more.

What I’d avoid

• Pure JS “all-in-one” PDF libraries for serious SaaS workloads, if you expect:
  • large files
  • weird PDFs
  • password-protected PDFs
  • high volume They can be fine for basic use, but they’re often less robust.

My recommendation by situation

• Small/medium SaaS, self-hosted: qpdf or pikepdf
• Node stack: pdf-lib for simple cases, but consider calling qpdf in a worker
• Enterprise/compliance/advanced needs: Apryse or PSPDFKit
• Need browser-side processing: only if files are small; otherwise do it server-side

Practical SaaS architecture

Use a backend job queue:

1. user uploads PDFs
2. store files in object storage
3. worker runs merge/split using qpdf/pikepdf
4. return generated PDF
5. delete temp files securely

If you want my direct pick

• Best open-source choice: qpdf
• Best Python wrapper: pikepdf
• Best commercial SDK: Apryse

If you tell me your stack (Node, Python, Java, .NET) and whether you want self-hosted or API-based, I can recommend the exact library and architecture.