This guide shows how to Java Aspose.Words developers can programmatically modify the font of a DOCX document using the Aspose.Words Cloud REST API, covering font size, style, and other attributes through the Java SDK.

Prerequisite

• Create an account and get API credentials
• Download the Aspose.Words Cloud SDK for Java to work with Word files
• Set up a Java project and add the SDK dependencies for font manipulation

Steps to Change Font on Word with Java Low Code API

1. Initialize the WordsApi object with your client ID and secret for changing the font
2. Load the source Word document that contains the text you want to modify
3. Create a new Font object and set parameters such as bold, size, and italic
4. Build an UpdateRunFontOnlineRequest object to specify the font update operation
5. Call the UpdateRunFontOnline() method to apply the new font settings to the uploaded document
6. Save the response stream returned by the API, which now contains the document with updated fonts

The steps above illustrate how to change font in Word with Java Low Code API. Load the source Word file, create a Font instance and configure its properties, instantiate an UpdateRunFontOnlineRequest, and invoke UpdateRunFontOnline() to modify the font in the uploaded document. Finally, write the response stream to disk to obtain the updated file.

Code to Change Font in Word Document with Java REST API

This snippet demonstrates setting bold, italic, and font size in a Word document via the Java Low Code API. You can also configure color, text effects, underline style, all‑caps, borders, and specify the paragraph reference using a zero‑based index.

For further customization of Word files, see the article on how to change properties of Word document with Java REST API.

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