Google Apps Script: Reset Font Styles in Google Docs

by 
function resetFontStyles() {
  // Open the active Google Docs document
  const doc = DocumentApp.getActiveDocument();
  const body = doc.getBody();

  // Iterate through all the elements in the body
  resetElementStyles(body);

  Logger.log("Font styles reset to default.");
}

function resetElementStyles(element) {
  const elementType = element.getType();

  // Check the type of element
  switch (elementType) {
    case DocumentApp.ElementType.PARAGRAPH:
    case DocumentApp.ElementType.TEXT:
      // Reset the styles for text elements
      element.editAsText().setFontSize(null).setForegroundColor(null).setBold(false).setItalic(false).setUnderline(false).setBackgroundColor(null);
      break;

    case DocumentApp.ElementType.LIST_ITEM:
      // Reset the styles for list items
      element.asListItem().editAsText().setFontSize(null).setForegroundColor(null).setBold(false).setItalic(false).setUnderline(false).setBackgroundColor(null);
      break;

    case DocumentApp.ElementType.TABLE:
      // Reset the styles for table elements
      const table = element.asTable();
      for (let r = 0; r < table.getNumRows(); r++) {
        const row = table.getRow(r);
        for (let c = 0; c < row.getNumCells(); c++) {
          resetElementStyles(row.getCell(c));
        }
      }
      break;

    case DocumentApp.ElementType.TABLE_CELL:
      // Reset the styles for table cell content
      const cell = element.asTableCell();
      const cellElements = cell.getNumChildren();
      for (let i = 0; i < cellElements; i++) {
        resetElementStyles(cell.getChild(i));
      }
      break;

    default:
      // Handle other element types, if necessary
      if (element.getNumChildren) {
        for (let i = 0; i < element.getNumChildren(); i++) {
          resetElementStyles(element.getChild(i));
        }
      }
  }
}

How It Works:

  1. resetFontStyles: This is the main function that you can run. It resets all text elements’ font sizes, colors, and styles to default in the active Google Doc.
  2. resetElementStyles: A recursive helper function that handles the nested structure of a Google Docs document, including paragraphs, text, tables, and table cells.
  3. Defaults:
    • Font size: null (resets to default size based on the document’s theme).
    • Font color: null (resets to black).
    • Style attributes (bold, italic, underline, background color): reset to default (off or none).

How to Use:

  1. Open a Google Docs document.
  2. Go to Extensions > Apps Script.
  3. Paste the script above into the editor and save the project.
  4. Close the Apps Script editor and reload your Google Doc.
  5. Go to Extensions > Apps Script > Reset Font Styles to run the script.

This script will reset all font styles in the document to default values. Let me know if you’d like any additional features!