JAR File Extension

JAR file icon
Java Archive Format
  • Developer
  • Popularity
    3.4 (12 votes)

What is JAR file?

Files with the JAR extension are files of archives compressed in the ZIP package, used by the JRE – Java Runtime Environment programming environment. JAR packages contain metadata files and files containing resources, such as texts, images or other types of data, packed into a single file, possible to be used with the Java environment.

Additional information

JAR package can be also a separate Java application, if it has a specified main class. A JAR file enables the executable environment to efficiently apply classes of applications and related resources, which highly increases speed of functioning. Each, singular element of JAR packages can be also further compressed, which highly reduces weigh of packages and enables to send them quickly.

Among metadata of a JAR file, there can be a manifest file, which defines the method of utilisation of a given package. There can be also a digital signature within a manifesto.

Content of a JAR file

In order to browse through the content of a JAR file, you can use any popular tool for files decompression, and perform the same actions as in case of a standard ZIP archive. You can also use the command line and the jar tool: "jar -xf file.jar”.

Conversion of a JAR file

When you install one of the applications from the list of programs that you found here, you should be able to open or edit the file with the JAR extension without any issue. However, if you still have problems with this, you may use the option of JAR file conversion to a different format.

File Conversions from JAR extension to a different format
File conversions from other format to JAR file

We hope we helped you solve the problem with the JAR file. If you do not know where you can download the application from our list, click on the link (which is the name of the program) - you will find more information there on the location where to download the secure setup version of the required application.

What else may cause problems?

There can be more reasons which determine that you are not able to open the JAR file (apart from the lack of the proper application installed).

First - the JAR file may be incorrectly associated with the application installed to support it. In this case, you need to change this association by yourself. To do this, right-click on the JAR file that you want to edit, click "Open with" and then select the program from the list that you have installed. After this operation, the problems with opening the JAR file should be solved.

Second - the file you want to open can simply be damaged. Then, the best solution is to find a new version of given file, or download it again from the same source as before (maybe for some reason in the previous session the download of the JAR file has not been completed and it cannot be opened properly).

Do you want to help?

If you have additional information about the JAR file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on JAR file.

Top File Extensions
Show more
File Extension of the day
edi icon


Electronic Data Interchange Format

EDI file extension is used by database files conforming to the EDI (Electronic Data Interchange) standard. EDI files store strucutred data in plain...