Google Apps Script to download images from a Google Doc into a Google Drive folder

download.js

function saveGoogleDocsImages() {
  // Define the folder name where the extracted images will be saved
  const folderName = 'Document Images';

  // Check if a folder with the specified name already exists
  const folders = DriveApp.getFoldersByName(folderName);

  // If the folder exists, use it; otherwise, create a new folder
  const folder = folders.hasNext() ? folders.next() : DriveApp.createFolder(folderName);

  // Get all the images in the document's body and loop through each image
  DocumentApp.getActiveDocument()
    .getBody()
    .getImages()
    .forEach((image, index) => {
      // Get the image data as a Blob
      const blob = image.getBlob();

      // Extract the file extension from the Blob's content type (e.g., 'jpeg', 'png')
      const [, fileExtension] = blob.getContentType().split('/');

      // Generate a unique file name for each image based on its position in the document
      const fileName = `Image #${index + 1}.${fileExtension}`;

      // Set the Blob's name to the generated file name
      blob.setName(fileName);

      // Create a new file in the specified folder with the image data
      folder.createFile(blob);

      // Log a message indicating that the image has been saved
      Logger.log(`Saved ${fileName}`);
    });
}