Merge PDFs

Combine two or more PDFs into a single document. Supports URLs, base64, multipart uploads, and custom metadata.

What It Does

Combines two or more PDFs into a single document. Google Drive share links are automatically converted to direct-download URLs.

When to Use

• Combine multiple PDF invoices, reports, or contracts into one file
• Merge chapters or sections into a single document

Required Inputs

Provide one of:

• urls — array of PDF URLs (2-25)
• files — array of base64-encoded PDFs
• Multipart upload with files field(s)

Authentication

Send your API key in the CLIENT-API-KEY header.

Get your free API key at https://pdfapihub.com. Full API documentation is available at https://pdfapihub.com/docs.

Use Cases

• Invoice Bundling — Combine monthly invoices into a single PDF for clients
• Report Assembly — Merge cover page, table of contents, and report chapters into one document
• Legal Document Packets — Bundle contracts, appendices, and exhibits into one filing
• Student Submissions — Merge multiple assignment PDFs into one submission file
• Mortgage/Loan Packages — Combine application forms, ID scans, and financial docs into one package
• Book Assembly — Merge individual chapter PDFs into a complete manuscript

Limits

Constraint	Value
Max input files	25
Max pages per document	200
Max total pages	500
Max input file size	50 MB
Download timeout	60 s

Example Usage

bash

curl -X POST https://pdfapihub.com/api/v1/pdf/merge \
  -H "CLIENT-API-KEY: your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "urls": [
      "https://pdfapihub.com/sample.pdf",
      "https://pdfapihub.com/sample1.pdf"
    ],
    "output": "url"
  }'