File Extension JAR

  • Full name
    Compressed Archive Format Package For Java Classes And Data Format
  • Developer
  • Popularity
Have you encountered a problem with a JAR file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a JAR file here. In the further part of this page we have added a list of programs that should open your JAR file. It is enough you choose a proper application for your operating system, download and install it.


A JAR file is a Java archive file containing Java files and metadata. Jar files are archives packed with the ZIP algorithm, which are often used to distribute Java libraries or Java applications. By using it as a container for an application, of course, images, audio data, etc. can also be included in a JAR file.

Java is a platform-independent programming language that only needs an installed Java Runtime Environment (JRE) to run a program. JAR applications can often be started simply by double-clicking or execute command.

Since JAR files are simple zip archives, the interested user can of course also unpack these files with an unpacker like Winzip or 7-Zip.

Programs which can open a JAR file

How to open a JAR file? Advice and guidance

Absolutely most often appearing reason that prevents you from opening the JAR file is the lack of a proper application to support it in your operating system. It is notably the first thing you need to address. When one of the programs to support a JAR file from the list is already installed, you can try to rerun the file. The system should display a message asking you to choose a primary application to support JAR files. At this point we are looking for disk space where the application was installed in and we can link it with a JAR file. Since then, our operating system will use the selected program to support all JAR files.

Other issues

Despite the described problem with JAR there may be many more problems. If the existing operations were not effective, get involved with the following matters:

- verify that the JAR file is not damaged and that it has been downloaded or copied in whole
- verify that the file has a file extension that has not been intentionally changed (for example, if it do not contain other information than its extension suggests)
- make sure again whether the JAR file type is linked in the operating system with a proper program
- make sure that the file is not infected with a virus and you have up to date software and drivers.

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