How to open Javadoc JAR file in web browser Rename the file adminCenter-1.0-23.0.0.8-javadoc.jar to adminCenter-1.0-23.0.0.8-javadoc.zip Use your favourite unzip tool (WinRAR / WinZIP) to extract it, now you have a folder adminCenter-1.0-23.0.0.8-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 "adminCenter-1.0-23.0.0.8-sources.jar" -d "adminCenter-1.0-23.0.0.8-javadoc" -subpackages