How to open Javadoc JAR file in web browser Rename the file sdk-java-0.9.15.3-javadoc.jar to sdk-java-0.9.15.3-javadoc.zip Use your favourite unzip tool (WinRAR / WinZIP) to extract it, now you have a folder sdk-java-0.9.15.3-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 "sdk-java-0.9.15.3-sources.jar" -d "sdk-java-0.9.15.3-javadoc" -subpackages