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With Slides Editor app it's easy to change PowerPoint background online. There is no need to install PowerPoint or any other tool, you just open the app and start editing the presentation. The interface of Slides Editor app is simple and it's easy to understand how to change background for PowerPoint presentation. First, you need to upload the source presentation. Then, open Settings tab on the right-side and change background there. Now, you may save the result by downloading the presentation with the new background in PPT(X) format. Slides Editor allows to change background for: simple presentation, presentation template, single slide.
Other Aspose Apps you may want to try: Merger web app for merging presentations; Watermark web app for adding watermarks to presentations.
Read an article on creating invitations in PowerPoint: 3 Easy Steps for Creating Invitations in PowerPoint
You can also edit other file formats. Please see the list below.