png2pdf.js

gistfile1.txt

// merge-png-to-pdf.js
//
// Instalacja:
// npm install pdf-lib
//
// Uruchomienie:
// node merge-png-to-pdf.js output.pdf image1.png image2.png image3.png

import { existsSync, readFileSync, writeFileSync } from 'fs';
import { extname } from 'path';
import { PDFDocument } from 'pdf-lib';

async function mergePngToPdf(outputFile, inputFiles) {
  if (!inputFiles.length) {
    throw new Error('Brak plików PNG.');
  }

  const pdfDoc = await PDFDocument.create();

  for (const file of inputFiles) {
    if (!existsSync(file)) {
      throw new Error(`Plik nie istnieje: ${file}`);
    }

    const ext = extname(file).toLowerCase();

    if (ext !== '.png') {
      throw new Error(`Nieobsługiwany format: ${file}`);
    }

    const imageBytes = readFileSync(file);

    const pngImage = await pdfDoc.embedPng(imageBytes);

    const width = pngImage.width;
    const height = pngImage.height;

    const page = pdfDoc.addPage([width, height]);

    page.drawImage(pngImage, {
      x: 0,
      y: 0,
      width,
      height,
    });

    console.log(`Dodano: ${file} (${width}x${height})`);
  }

  const pdfBytes = await pdfDoc.save();

  writeFileSync(outputFile, pdfBytes);

  console.log(`\nPDF zapisany: ${outputFile}`);
}

async function main() {
  const [, , outputFile, ...inputFiles] = process.argv;

  if (!outputFile || inputFiles.length === 0) {
    console.log(`
Użycie:
node merge-png-to-pdf.js output.pdf image1.png image2.png ...

Przykład:
node merge-png-to-pdf.js dokument.pdf 1.png 2.png 3.png
`);
    process.exit(1);
  }

  try {
    await mergePngToPdf(outputFile, inputFiles);
  } catch (err) {
    console.error('Błąd:', err.message);
    process.exit(1);
  }
}

main();