JAR File Extension  What is .Jar and how to open them? ▷ 2020

Do you have problems with a file with a .JAR extension? Not sure what to do to view the content you downloaded? In this article we will show you the .JAR file extension so that you know what they are and how to open this type of file?

Certainly a digital file as this was not designed so that any app could open it, files with .JAR extensions naturally they are extensions, data files and communication.

Below you will have all the information you need so that you can use this extension, You will know what it is and what it is used for, to how to open this type of files on cell phones and computers. We will show you even a list of applications with which you can open the files.

What is .JAR files and what are they used for?

files with extension .JAR

A .JAR file also called .JRE is a Java Archive extension that can be seamlessly integrated with Oracle codebase. Per se uses the stored reference data as an internal library of applications or programs with a Java development, ready to exercise its functionality on the platforms that I enable Java Runtime Evironment.

Files with a Java extension may contain encrypted codes for initial development in the execution of a program stipulated by the source software. Besides, also They can be enabled to be used on platforms from Android cell phones, iPhone, tablets, desktop computers or laptops, all this thanks to Java Runtime Evironment.

You can choose resources that include an optional device in a file handled with a .JAR extension. These are not the only ones with the ability to hold this file, since there are also web browsers capable of supporting the execution environment due to the integration of programs in them, Thanks to these advances, you can now access data stored in these .JAR files.

Before the .JAR file extensions were acquired by Oracle, the original developer was Sun Microsystems. Evolution was what led this program to be a virtual machine, known today as Java Runtime Environment.

How to open and run .JAR files on Smartphone or computers?

Today you can run these files on any device, either from your computer or cell phone. There are no longer limits to expanding our greediest desires with .JAR extensions, and I will show you how to access it from a Windows PC on Mac computers, on Android phones and on iPhone with iOS.

On Windows PC

Opening and running a .JAR file in Windows is a relatively easy process. While not all applications can perform this task, in this operating system there is a way to do it fast.

  • To access a .JAR file you need install java on your computer. Download it in its entirety for free by simply pressing the button “Download”.


  • When the download is complete, proceed with the installation. Follow the steps they recommend as you progress.
  • Restart your computer to finish the installation, and thus proceed with accessing a JAR file
  • With Java installed, go to the file you want to open with a .JAR extension. Double click, and if the procedure is well done, it should open.

When the file does not open immediately, it is because it needs certain affirmations. A window will open asking you what program you want to use to open the file, you will click on the option that says JAVA (TM); Then in “To accept” Y “Continue”. Doing so should be able to open the executable.

Otherwise, keep the following considerations in mind:

  • Make sure the JAR files you download are executable. Many times we download programs that are compatible with us so they will not open.
  • If the file still won’t open, try updating java. Most likely, you have downloaded an old version.

If, after making sure of all this, the file still does not run, there may have been an error in the Java installation, so you will have to uninstall it and go through the software download process again.

On Mac computers

On MacOS computers it is also very easy to run a file with a .JAR extension, since you can also use Java TM on it.

The steps are very similar to the previous ones, you simply must:

  • The first thing you should do is install Java on your computer. Access their page Java.com online and download it in its entirety for free.


Apple will always try to protect its users from something that does not come from its brand, so you should “To accept” after the download in the warning that your team will give you.

To continue the installation follow these steps:

  • It will ask you if you want to open with a warning. Click on the option “Open in the same way” to install the file.
  • At the end of the download, proceed with the installation. Follow the steps indicated by the wizard and you will complete the process in no time.


  • Restart your computer to finish the installation. Once complete, you can easily run your JAR file.
  • Once Java is installed, go to the file you want to open with a java extension, double-click and if the procedure is well done it should open.

The file may not open right away as Java doesn’t automatically recognize it as yours. Therefore, you should set this program as the default to run JAR files. For this you simply have to right click on the executable file and click on “Open”, after that you will see a list of software that you can choose to run. Select Java and “To accept” so that it opens.

If after all this the .JAR still cannot be executed, you must take into account the following factors that may be influencing it:

  • You should make sure to see the file downloaded on a Mac version. EThis may be the cause of the file not opening.
  • You may have installed an old version of Java software, so you will have to update it to be able to open the file if necessary.
  • Make sure the JAR file is executable. This usually happens because users think that all files with this extension are, but the reality is that there are different types of these and not all of them can be executed, but they are libraries with information.

On Android mobile phones

JAR files are perfectly executable on Android devices, but for this it must be directly related to one of the applications installed on it. In this way the file will be executed with the corresponding application.

The steps to be carried out are the following:

  • The procedure is extremely simple. Starts with connect your Android phone to your computer via USB cable.
  • Now create a folder called “JAR” in the files that make up your mobile and you will have to move the file you want to execute to it.
  • To continue with the procedure, disconnect from the PC and navigate on your cell phone to the folder where you saved the files JAR Y select the option to install and run the JAR files you want.

On iPhone devices with iOS

Apple mobile devices do not have factory support for JAVA, so you will have to install it using Cydia, which allows you to install apps outside of the Apple Store.

What you should do is the following:

Download Cydia for iPhone

  • Open the Cydia app on your iPhone and in the section “Categories” Choose “JAVA”.
  • In this folder you will see a series of apps from this developer. You must select the one that says “iPhone / Java”.


  • You will see a message with information about the size of the app, you must click on “Confirm” for it to install.
  • Then you must go back to the Java category and install another app called Jikes“, and proceed to restart your mobile.

When the iPhone is turned on again, you should have the app available on the desktop, so that you can open it to run any JAR file on your Apple mobile.

List of the best alternative applications and programs to run a document with a .Jar extension

Finally, we present a list of applications and alternative programs to JAVA that they can easily run files with the .JAR extension.

  • JAD Maker: It is an application that you can use to install JAR files from your cell phone, it works as an alternative if the original program does not work.
  • JAR2Exe: is an assistant converter of JAR files to EXE files for those who have had a complication when viewing their JAR files.
  • DOKRY: It is a page that works with computers for Windows users, the intention with this is not to download anything to see the file but rather to view it online.

Now you are ready to view all the JAR files you want, don’t waste any more time exploring with the news of the files you like the most. Seeing a .JAR file is no longer a limitation.

If you have any questions, leave them in the comments, we will answer you as soon as possible, and it will surely be of great help to more members of the community. Thank you! 😉

You may be interested:

Rate this post

Leave a Comment