Open one for free with Photopea, or use InDesign or QuarkXPress. Convert one to PDF, IDML, PSD, etc., with those apps and others. This article explains what an INDD file is and how to open and ...

To get started with Photopea, select whether you want to create PSD file or image or edit. According to your requirement, press either Ctrl+O or Ctrl+N. It is also possible to open a file from a URL.