UMlet Maven Plugin supports several output images formats. Specify the required format by providing the plugin format property as shown below:
<project>
...
<build>
...
<plugins>
...
<plugin>
<groupId>com.kryshchuk.maven.plugins</groupId>
<artifactId>umlet-maven-plugin</artifactId>
<configuration>
<format>jpg</format>
</configuration>
<executions>
<execution>
<id>convert-uml</id>
<goals>
<goal>convert</goal>
</goals>
</execution>
</executions>
</plugin>
...
</plugins>
...
</build>
...
</project>
Supported formats are: