Presentation Localization

Change Language for Presentation and Shape’s Text

• Create an instance of Presentation class.
• Obtain the reference of a slide by using its Index.
• Add an AutoShape of Rectangle type to the slide.
• Add some text to the TextFrame.
• Setting Language Id to text.
• Write the presentation as a PPTX file.

The implementation of the above steps is demonstrated below in an example.

using (Presentation pres = new Presentation("test0.pptx"))
{
    IAutoShape shape = pres.Slides[0].Shapes.AddAutoShape(ShapeType.Rectangle, 50, 50, 200, 50);
    shape.AddTextFrame("Text to apply spellcheck language");
    shape.TextFrame.Paragraphs[0].Portions[0].PortionFormat.LanguageId = "en-EN";

    pres.Save("test1.pptx",Aspose.Slides.Export.SaveFormat.Pptx);
}

FAQ

Does language_id trigger automatic text translation?

No. language_id in Aspose.Slides stores the language for spell-checking and grammar proofing, but it does not translate or change the text content. It is metadata that PowerPoint understands for proofing.

Does language_id affect hyphenation and line breaks during rendering?

In Aspose.Slides, LanguageId is for proofing. Hyphenation quality and line wrapping primarily depend on the availability of proper fonts and layout/line-break settings for the writing system. To ensure correct rendering, make the required fonts available, configure font substitution rules, and/or embed fonts into the presentation.

Can I set different languages within a single paragraph?

Yes. LanguageId is applied at the text portion level, so a single paragraph can mix multiple languages with distinct proofing settings.