https://www.pbainbridge.co.uk/2024/02/replace-text-in-google-doc-with-image.html

Replace text in a Google Doc with an image.gs

/**
 * Function to replace <<keyword>> tag in Google Doc with relevant image.
 * 
 * @OnlyCurrentDoc
 * 
 * DEVELOPED BY THE GIFT OF SCRIPT: https://www.pbainbridge.co.uk/
 */


function replaceTextToImage() {


  // ******************** COMPLETE THESE ITEMS ********************
  var searchText = "??";

  var imageURL = "??";

  var size = 250;

  var hyperlinkURL = "??";
  // ******************** COMPLETE THESE ITEMS ********************


  // get Doc body
  var body = DocumentApp.getActiveDocument().getBody();

  // get position of text in Doc
  var textPosition = body.findText(searchText).getElement();

  // replace text with nothing
  textPosition.asText().setText("");

  // extract ID from URL via regex
  var imageFileId = imageURL.match(/[-\w]{25,}/);

  // get image blob
  var image = DriveApp.getFileById(imageFileId).getBlob();


  // insert image and resize
  var img = textPosition.getParent().asParagraph().insertInlineImage(0, image);
  var w = img.getWidth();
  var h = img.getHeight();
  img.setWidth(size);
  img.setHeight(size * h / w);


  // check if a hyperlink has been provided for the image
  if (hyperlinkURL == "") {

    // do nothing

  } else {

    // make image clickable
    img.setLinkUrl(hyperlinkURL);

  };


}