How to open Javadoc JAR file in web browser Rename the file ksc-sdk-java-krds-0.3.31-javadoc.jar to ksc-sdk-java-krds-0.3.31-javadoc.zip Use your favourite unzip tool (WinRAR / WinZIP) to extract it, now you have a folder ksc-sdk-java-krds-0.3.31-javadoc Double click index.html will open the index page on your default web browser. How to generate Javadoc from a source JAR? Running the command javadoc: javadoc --ignore-source-errors -encoding UTF-8 -sourcepath "ksc-sdk-java-krds-0.3.31-sources.jar" -d "ksc-sdk-java-krds-0.3.31-javadoc" -subpackages