Aspose.Slides Editor App is used to create and edit PowerPoint presentations (PPT or PPTX), templates and layouts. Load your presentation and observe the slides. Choose the element on a slide and modify its properties, color, size, layout, etc. Move, resize and delete elements. Zoom the slides, change z-order, etc. Download the resulting presentation in different formats as PDF, TIFF, etc.
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.