# Render Presentations with Fallback Fonts on Android

> Render presentations with fallback fonts in Aspose.Slides for Android – keep text consistent across PPT, PPTX and ODP with step-by-step Java code samples.

Source: https://docs.aspose.com/slides/androidjava/render-presentation-with-fallback-font/
Updated: 2026-08-05


## **Overview**

Aspose.Slides allows you to render presentations using fallback font rules. This article shows how to create a fallback font rules collection, modify its rules by removing or adding fallback fonts, and assign the collection using the `FontsManager.setFontFallBackRulesCollection` method.

Once the fallback font rules collection is assigned to the presentation's `FontsManager`, the rules are applied during operations such as saving, rendering, and converting the presentation. The example demonstrates how to use the configured rules when rendering a slide thumbnail and saving it as a JPEG image.

## **Render a Slide Using Fallback Font Rules**

The following example includes these steps:

1. We [create fallback font rules collection](/slides/androidjava/create-fallback-fonts-collection/).
1. [Remove](https://reference.aspose.com/slides/androidjava/com.aspose.slides/FontFallBackRule#remove-java.lang.String-) a fallback font rule and [addFallBackFonts](https://reference.aspose.com/slides/androidjava/com.aspose.slides/FontFallBackRule#addFallBackFonts-java.lang.String-) to another rule.
1. Set rules collection to [getFontsManager](https://reference.aspose.com/slides/androidjava/com.aspose.slides/Presentation#getFontsManager--).[getFontFallBackRulesCollection](https://reference.aspose.com/slides/androidjava/com.aspose.slides/FontsManager#getFontFallBackRulesCollection--) method.
1. With [Presentation.save](https://reference.aspose.com/slides/androidjava/com.aspose.slides/Presentation#save-java.lang.String-int-) method we can save presentation in the same format, or save it in another one. After fallback font rules collection is set to [FontsManager](https://reference.aspose.com/slides/androidjava/com.aspose.slides/FontsManager), these rules are applied during any operations over the presentation: save, render, convert, etc.

```java
import com.aspose.slides.*;

// Create new instance of a rules collection
IFontFallBackRulesCollection rulesList = new FontFallBackRulesCollection();

// create a number of rules
rulesList.add(new FontFallBackRule(0x400, 0x4FF, "Times New Roman"));
rulesList.add(new FontFallBackRule(0x600, 0x6FF, "Tahoma, Arial"));

for (IFontFallBackRule fallBackRule : rulesList)
{
    //Trying to remove FallBack font "Tahoma" from loaded rules
    fallBackRule.remove("Tahoma");

    //And to update of rules for specified range
    if ((fallBackRule.getRangeEndIndex() >= 0x400) && (fallBackRule.getRangeStartIndex() < 0x500))
        fallBackRule.addFallBackFonts("Verdana");
}

//Also we can remove any existing rules from list, keeping at least one rule to render with
if (rulesList.size() > 1)
    rulesList.remove(rulesList.get_Item(1));

Presentation pres = new Presentation("input.pptx");
try {
    //Assigning a prepared rules list for using
    pres.getFontsManager().setFontFallBackRulesCollection(rulesList);

    // Rendering of thumbnail with using of initialized rules collection and saving to JPEG
   IImage slideImage = pres.getSlides().get_Item(0).getImage(1f, 1f);

   //Save the image to disk in JPEG format
   try {
         slideImage.save("Slide_0.jpg", ImageFormat.Jpeg);
   } finally {
        if (slideImage != null) slideImage.dispose();
   }
} finally {
    if (pres != null) pres.dispose();
}
```

{{% alert color="primary" %}} 
Read more about [Convert PPT and PPTX to JPG on Android](/slides/androidjava/convert-powerpoint-to-jpg/).
{{% /alert %}}