Merge Two or More PDFs

import {PdfDocument} from "@ironsoftware/ironpdf";

(async () => {
    const html_a = `<p> [PDF_A] </p>
    <p> [PDF_A] 1st Page </p>
    <div style='page-break-after: always;'></div>
    <p> [PDF_A] 2nd Page</p>`;

    const html_b = `<p> [PDF_B] </p>
    <p> [PDF_B] 1st Page </p>
    <div style='page-break-after: always;'></div>
    <p> [PDF_B] 2nd Page</p>`;

    // Render HTML content to PDF documents
    const pdfdoc_a = await PdfDocument.fromHtml(html_a);
    const pdfdoc_b = await PdfDocument.fromHtml(html_b);

    // Merge the two PDF documents
    const merged = await PdfDocument.mergePdf([pdfdoc_a, pdfdoc_b]);

    // Save the merged PDF
    await merged.saveAs("Merged.pdf");  
})();

Merge Two or More PDFs

The code above enables you to combine multiple PDF documents created from different HTML contents into a single PDF file.

Two HTML contents have been rendered into separate PDF documents. The PdfDocument.mergePdf method is utilized to merge the two PDF documents, pdfdoc_a and pdfdoc_b, into a single PDF document named "merged."

The merging process is not limited to freshly rendered PDFs; it can also be applied to existing PDF documents using this method.

# Import required libraries
from pypdf import PdfMerger

# Paths to the PDF documents that need to be merged
pdf_path_a = "path/to/pdfdoc_a.pdf"
pdf_path_b = "path/to/pdfdoc_b.pdf"

# Initialize a PdfMerger object
merger = PdfMerger()

# Append the first PDF document to the merger object
merger.append(pdf_path_a)

# Append the second PDF document to the merger object
merger.append(pdf_path_b)

# Write out the merged PDF to a new file
with open("merged.pdf", "wb") as output_pdf:
    merger.write(output_pdf)

# Close the merger to free up resources
merger.close()

# Import required libraries
from pypdf import PdfMerger

# Paths to the PDF documents that need to be merged
pdf_path_a = "path/to/pdfdoc_a.pdf"
pdf_path_b = "path/to/pdfdoc_b.pdf"

# Initialize a PdfMerger object
merger = PdfMerger()

# Append the first PDF document to the merger object
merger.append(pdf_path_a)

# Append the second PDF document to the merger object
merger.append(pdf_path_b)

# Write out the merged PDF to a new file
with open("merged.pdf", "wb") as output_pdf:
    merger.write(output_pdf)

# Close the merger to free up resources
merger.close()

PYTHON

Explanation

Library Import: We import PdfMerger from the pypdf library, which is responsible for merging the PDFs.
File Paths: Define the file paths for the PDFs to be merged. Modify pdf_path_a and pdf_path_b to the actual file paths of the PDFs you wish to merge.
PdfMerger Object: We create an instance of PdfMerger to which we can append the individual PDFs.
Appending PDFs: Use the append method of PdfMerger to add each PDF into the merger sequence.
Writing the Merged PDF: Open (or create) the file where the merged content will be saved using a context manager with open(...). This ensures the file is properly closed after writing.
Closing the Merger: Calls merger.close() to clean up resources used by PdfMerger.