Set slide size and orientation

Overview

Choose a standard slide size or set custom dimensions for a presentation. You can also change orientation and select how existing content should be scaled or fitted. Set these choices before assembling a deck when possible, so its layout starts with the right canvas.

Usage example (C# / .NET)

Install Aspose.Slides for .NET before running this standalone example.

This C# example sets a 960 by 540 point canvas and explicitly leaves shape coordinates unchanged. The rectangle stays at 60,60 with a size of 240 by 100 points; the new canvas has a 16:9 aspect ratio.

using Aspose.Slides;
using Aspose.Slides.Export;

using var presentation = new Presentation();
presentation.Slides[0].Shapes.AddAutoShape(ShapeType.Rectangle, 60, 60, 240, 100);
presentation.SlideSize.SetSize(960, 540, SlideSizeScaleType.DoNotScale);
presentation.Save("slide-size.pptx", SaveFormat.Pptx);

FAQ

Can I change the size of an existing deck?

Yes. Choose a fitting or scaling behavior appropriate to its content, rather than only changing the canvas dimensions.

Can I change slide size without scaling the shapes?

Yes. Choose the policy that leaves existing shape coordinates and dimensions unchanged. Review the resulting layout because a larger or smaller canvas can leave unused space or place objects outside the visible area.

Which units are used for slide width and height?

Slide dimensions use points: 72 points equal one inch. Use the same units when calculating shape placement for the new canvas.