Create PowerPoint Presentation in JavaScript

Create PowerPoint Presentation

To add a simple plain line to a selected slide of the presentation, please follow the steps below:

1. Create an instance of Presentation class.
2. Obtain the reference of a slide by using its Index.
3. Add an AutoShape of Line type using addAutoShape method exposed by Shapes object.
4. Write the modified presentation as a PPTX file.

In the example given below, we have added a line to the first slide of the presentation.

// Instantiate a Presentation object that represents a presentation file
var pres = new aspose.slides.Presentation();
try {
    // Get the first slide
    var slide = pres.getSlides().get_Item(0);
    // Add an autoshape of type line
    slide.getShapes().addAutoShape(aspose.slides.ShapeType.Line, 50, 150, 300, 0);
    pres.save("NewPresentation_out.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    if (pres != null) {
        pres.dispose();
    }
}

FAQ

What formats can I save a new presentation to?

You can save to PPTX, PPT, and ODP, and export to PDF, XPS, HTML, SVG, and images, among others.

Can I start from a template (POTX/POTM) and save as a regular PPTX?

Yes. Load the template and save to the desired format; POTX/POTM/PPTM and similar formats are supported.

How do I control slide size/aspect ratio when creating a presentation?

Set the slide size (including presets like 4:3 and 16:9 or custom dimensions) and choose how content should scale.

In what units are sizes and coordinates measured?

In points: 1 inch equals 72 units.

How do I handle very large presentations (with many media files) to reduce memory usage?

Use BLOB management strategies, limit in-memory storage by leveraging temporary files, and prefer file-based workflows over purely in-memory streams.

Can I create/save presentations in parallel?

You cannot operate on the same Presentation instance from multiple threads. Run separate, isolated instances per thread or process.

How do I remove the trial watermark and limitations?

Apply a license once per process. The license XML must remain unmodified, and the license setup should be synchronized if multiple threads are involved.

Can I digitally sign the PPTX I create?

Yes. Digital signatures (adding and verifying) are supported for presentations.

Are macros (VBA) supported in created presentations?

Yes. You can create/edit VBA projects and save macro-enabled files such as PPTM/PPSM.