pdf merge api

If you want a PDF merge API, there are a few common ways to do it depending on your stack:

1. Using a cloud API

Popular options:

• Adobe PDF Services API
• PDF.co
• iLovePDF API
• Sejda API
• Cloudmersive Document Conversion API

These usually let you upload multiple PDFs and return one merged file.

2. Build your own API

If you want a simple backend endpoint, you can create one with:

• Node.js: pdf-lib
• Python: pypdf
• Java: Apache PDFBox
• .NET: iText or PdfSharp

Example in Node.js with pdf-lib:

import { PDFDocument } from 'pdf-lib';
import fs from 'fs';

async function mergePdfs(files) {
  const mergedPdf = await PDFDocument.create();

  for (const file of files) {
    const pdfBytes = fs.readFileSync(file);
    const pdf = await PDFDocument.load(pdfBytes);
    const copiedPages = await mergedPdf.copyPages(pdf, pdf.getPageIndices());
    copiedPages.forEach((page) => mergedPdf.addPage(page));
  }

  const mergedBytes = await mergedPdf.save();
  fs.writeFileSync('merged.pdf', mergedBytes);
}

3. Sample API endpoint

If you want an HTTP API, your endpoint might look like:

• POST /merge-pdfs
• body: multiple uploaded PDF files
• response: merged PDF

4. If you want a ready-made API spec

I can generate:

• REST API design
• FastAPI / Express / Flask implementation
• OpenAPI/Swagger spec
• cURL example
• Postman collection

If you want, I can give you a complete PDF merge API in Node.js or Python.