Do I need a library or an API for PDF merging and splitting?

Yes — usually you need a PDF library or a PDF API/service for merging and splitting PDFs.

What’s the difference?

• Library: You install code in your app and do the work locally.

  • Good for: full control, offline use, lower recurring cost
  • Examples: PyPDF2, pypdf, PDFBox, iText, PDFSharp

• API / service: You send PDFs to a remote endpoint and get the result back.

  • Good for: quick setup, less maintenance, easier scaling
  • Examples: Adobe PDF Services API, PDF.co, PSPDFKit, CloudConvert

When to use each

• Use a library if:

  • You want to process files on your own server or device
  • You need offline capability
  • You want to avoid sending sensitive documents to a third party

• Use an API if:

  • You don’t want to manage PDF processing code
  • You need advanced features or high reliability
  • You’re okay with cloud processing

In short

For merging and splitting PDFs, you generally need some tool that understands PDF structure. That tool can be either:

• a library in your app, or
• an external API/service

If you want, I can also recommend the best option for your language or use case (Python, Java, Node.js, etc.).