The use of appropriate fonts is one of the key elements of making successful documents. For example, we typically use different fonts for headings and paragraphs in order to create distinction and achieve a visually pleasing effect. When you receive a PDF document where the fonts are properly used, you may wish to change them. In this article, you’ll learn how to replace the fonts being used in a PDF document using Spire.PDF for Java.
Install Spire.PDF for Java
First of all, you're required to add the Spire.Pdf.jar file as a dependency in your Java program. The JAR file can be downloaded from this link. If you use Maven, you can easily import the JAR file in your application by adding the following code to your project's pom.xml file.
<repositories>
<repository>
<id>com.e-iceblue</id>
<name>e-iceblue</name>
<url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>e-iceblue</groupId>
<artifactId>spire.pdf</artifactId>
<version>10.10.7</version>
</dependency>
</dependencies>
Replace All Used Fonts in a Document
A PDF document may use multiple fonts, and each font may have a different font size. When replacing these fonts, make sure that the font size does not change. Otherwise, the generated content may overlap or become disordered. The following are the steps to replace all used fonts in a document using Spire.PDF for Java.
- Create a PdfDocument object.
- Load a sample PDF file using PdfDocument.loadFromFile() method.
- Get all used fonts in the document using PdfDocument.getUsedFonts() method.
- Loop through the used fonts. Get the size of a specific font using PdfUsedFont.getSize() method.
- Create a new font based on the size obtained, and replace the old font with the new font using PdfUsedFont.replace() method.
- Save the document to a different PDF file using PdfDocument.saveToFile() method.
- Java
import com.spire.pdf.PdfDocument;
import com.spire.pdf.graphics.PdfFont;
import com.spire.pdf.graphics.PdfFontFamily;
import com.spire.pdf.graphics.PdfFontStyle;
import com.spire.pdf.graphics.fonts.PdfUsedFont;
public class ReplaceAllFonts {
public static void main(String[] args) throws Exception {
//Create a PdfDocument object
PdfDocument doc = new PdfDocument();
//Load a sample PDF file
doc.loadFromFile("C:\\Users\\Administrator\\Desktop\\Fonts.pdf");
//Get all used fonts in the document
PdfUsedFont[] fonts = doc.getUsedFonts();
//Travers all used fonts
for (PdfUsedFont font: fonts
) {
//Get the font size
float fontSize = font.getSize();
//Create a new font
PdfFont newfont = new PdfFont(PdfFontFamily.Times_Roman, fontSize, PdfFontStyle.Italic);
//Replace the current font with the new font
font.replace(newfont);
}
//Save the changes to a different PDF file
doc.saveToFile("output/ReplaceAllFonts.pdf");
}
}
Replace a Specific Font with a Different Font
The PdfDocument.getUsedFonts() method returns a collection of the fonts used in a PDF document. To identify a specific font from the fonts collection, use the PdfUsedFont.getName() method. The following are the steps to replace a specific font with a different font.
- Create a PdfDocument object.
- Load a sample PDF file using PdfDocument.loadFromFile() method.
- Get all used fonts in the document using PdfDocument.getUsedFonts() method.
- Loop through the used fonts, determining if a certain font is "Calibri".
- Get the font "Calibri" and get its size using PdfUsedFont.getSize() method.
- Create a new font based on the size obtained, and replace the font "Calibri" with the new font using PdfUsedFont.replace() method.
- Save the document to a different PDF file using PdfDocument.saveToFile() method.
- Java
import com.spire.pdf.PdfDocument;
import com.spire.pdf.graphics.PdfFont;
import com.spire.pdf.graphics.PdfFontFamily;
import com.spire.pdf.graphics.PdfFontStyle;
import com.spire.pdf.graphics.fonts.PdfUsedFont;
public class ReplaceSpecificFontWithNewFont {
public static void main(String[] args) throws Exception {
//Create a PdfDocument object
PdfDocument doc = new PdfDocument();
//Load a sample PDF file
doc.loadFromFile("C:\\Users\\Administrator\\Desktop\\Fonts.pdf");
//Get all fonts used in the document
PdfUsedFont[] fonts = doc.getUsedFonts();
//Travers all used fonts
for (PdfUsedFont font: fonts
) {
//Determine if a font’s name is "Calibri"
if(font.getName().equals("Calibri")){
//Get the font size
float fontSize = font.getSize();
//Create a new font
PdfFont newfont = new PdfFont(PdfFontFamily.Times_Roman, fontSize, PdfFontStyle.Italic);
//Replace the font "Calibri" with the new font
font.replace(newfont);
}
}
//Save the changes to a different PDF file
doc.saveToFile("output/ReplaceSpecificFont.pdf");
}
}
Apply for a Temporary License
If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.
