Image to PDF Showcase Demo Code Sample

Requirements

These packages are required to use these features in production. Trial keys have unlimited access to all features

Web SDKLive demo

Easily convert images to PDF, entirely on the client side, with no server required. This follows the Image to PDF demo on showcase.

This demo allows you to:

• Upload your own image format file (such as PNG, JPG, GIF, PNG, BMP, etc.)

• Add customized annotations

• Edit the layout and content

• Download the updated PDF

Implementation steps

To add image format conversion to PDF with WebViewer: Step 1: Get started with WebViewer in your preferred web stack Step 2: Add the ES6 JavaScript sample code provided in this guide

Once you generate your license key, it will automatically be included in your sample code below.

// ES6 Compliant Syntax
// GitHub Copilot - GPT-4 - July 21, 2025
// File: index.js

import WebViewer from '@pdftron/webviewer';
import saveAs from 'file-saver';

const licenseKey = 'YOUR_WEBVIEWER_LICENSE_KEY';

// Customize the WebViewer UI
const customizeUI = (instance) => {
  const { UI } = instance;

  // Set the toolbar group to the annotate tools
  UI.setToolbarGroup('toolbarGroup-Annotate');

  // Convert button
  const convertButton = new UI.Components.CustomButton({
    dataElement: 'convertToPdfButton',
    className: 'custom-button-class',
    label: 'Image to PDF',
    onClick: () => convert(instance), // convert the image to PDF
    style: {
      padding: '10px 10px',
      backgroundColor: 'blue',
      color: 'white',
    }
  });

  const defaultHeader = UI.getModularHeader('default-top-header');
  defaultHeader.setItems([...defaultHeader.items, convertButton]);
};

// convert the image to PDF
const convert = async (instance) => {

  // Get the document
  const document = instance.Core.documentViewer.getDocument();

  // Get the filename
  let fileName = document.getFilename();

  // Ensure it ends with .pdf. If not, replace it with .pdf extension
  if (!fileName.endsWith('.pdf'))
    fileName = fileName.replace(/\.[^/.]+$/, '') + '.pdf';

  try {
    const data = await document.getFileData({
      downloadType: 'pdf',
    });

    const arr = new Uint8Array(data);
    const blob = new Blob([arr], { type: 'application/pdf' });

    // Save the image as a PDF
    saveAs(blob, fileName);

  } catch (e) {
    console.error('❌ Conversion failed:', e);
  }
};

WebViewer(
  {
    path: '/lib',
    initialDoc: 'https://apryse.s3.us-west-1.amazonaws.com/public/files/samples/Vancouver_komal-brar.jpg',
    enableFilePicker: true, // Enable file picker to open files. In WebViewer -> menu icon -> Open File
    licenseKey: licenseKey, 
  },
  document.getElementById('viewer')
).then((instance) => {

  // customize WebViewer UI
  customizeUI(instance);

  console.log('✅ WebViewer loaded successfully.');
}).catch((error) => {
  console.error('❌ Failed to initialize WebViewer:', error);
});