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To verify that the keytool utility is available In the command prompt, invoke the keytool utility: (For Microsoft Windows) Type keytool.exe and press Enter. (For UNIX) Type keytool and press Enter. You can use the keytool utility from Oracle JDK Java 1.5 or 1.6.
keytool is located in JDK bin directory ($JAVA_HOME/bin). JAVA_HOME is your JDK installation directory. To use that command line you should also include $JAVA_HOME/bin to your PATH environment variable.
The Java keytool installs as part of a system's Java runtime engine (JRE) and runs at the Windows or Linux command line. To use keytool, install it on your system and configure its use as described below.
keytool is a tool to manage (public/private) security keys and certificates and store them in a Java KeyStore file (stored_file_name.jks).
It is provided with any standard JDK/JRE distributions.
You can find it under the following folder %JAVA_HOME%\bin.
keytool is part of the standard java distribution.
In a windows 64-bit machine, you would normally find the jdk at
C:\Program Files\Java\jdk1.8.0_121\bin
It is used for managing keys and certificates you can sign things with, in your case, probably a jar file.
If you provide more details of what you need to do, we could probably give you a more specific answer.
For me it turned out to be in c/Program Files/Java/jdk1.7.0_25/bin (Windows 8). A more general answer to this question is that it will most likely be in the bin sub directory of wherever your jdk is installed.
keytool it's a binary file into the JDK folder ... just add your JDK as environment variable by adding the following line
C:\Program Files\Java\jdk1.8.0_65\bin
If you are working with a Mac... the keytool is part of the Java SDK and can be found in the following location /System/Library/Java/JavaVirtualMachines/[VERSION].jdk/Contents/Home/bin/keytool
here: C:\Program Files\Java\jre7\bin it is an exe keytool.exe
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