Notepad saves a file in .txt format. By using Print to PDF and Save As options, you can save it as PDF and HTML in Windows 11/10.

Right-click the HTML file, select "Open With" and then click "Notepad." The file is opened in Notepad. Click "File" in the top left corner of the window and select "Save As" from the drop-down menu.

You don't need to be online to read a webpage. You can save one, with formatting and images, to local storage and read it later offline.