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How To Convert ISO to IMG in Linux

Ubuntu 18

In this article, we will guide you through the process of converting an ISO file to an IMG format in Linux. This can be particularly useful when you need to create a bootable USB drive or when dealing with certain applications that require the IMG format.

Quick Answer

To convert an ISO file to IMG format in Linux, you can use the geteltorito command-line tool. Simply run the command geteltorito input.iso > output.img, replacing input.iso with the name of your ISO file and output.img with the desired name of your IMG file.


Before we start, ensure that you have administrative access to your Linux system, and your system has the genisoimage package installed. This package provides the geteltorito utility, which we will use to perform the conversion. If you don’t have the package installed, you can install it using the following command:

sudo apt-get install genisoimage

Understanding the Conversion Process

The conversion process involves using the geteltorito command-line tool to extract the boot image from the ISO file and save it in the IMG format. The command structure is as follows:

geteltorito input.iso > output.img

In this command:

  • geteltorito is the command-line tool used for the conversion.
  • input.iso is the source ISO file that you want to convert. You should replace this with your actual ISO file name.
  • output.img is the destination IMG file. This is where the output of the conversion will be saved. You can replace this with your desired output file name.

Step-by-Step Guide

Now, let’s dive into the detailed steps of the conversion process.

Step 1: Navigate to the ISO File Directory

Open a terminal and navigate to the directory where your ISO file is located. You can do this using the cd command. For example, if your ISO file is located in the Downloads directory, you would use the following command:

cd ~/Downloads

Step 2: Convert the ISO File to IMG Format

Now that you’re in the correct directory, you can convert the ISO file to IMG format using the geteltorito command. For example, if you’re converting a file named ubuntu.iso and you want the output file to be named ubuntu.img, you would use the following command:

geteltorito ubuntu.iso > ubuntu.img

Wait for the conversion process to complete. The time it takes will depend on the size of the ISO file.


That’s it! You’ve successfully converted an ISO file to IMG format in Linux. You now have an IMG file that you can use for your needs.

Remember that the IMG file contains the bootable image from the ISO file, so it can be used for booting purposes if necessary.

For more information about the geteltorito command, you can refer to the geteltorito man page.

If you encounter any issues during the conversion process, don’t hesitate to consult the community on forums like Ask Ubuntu.

Can I convert an ISO file to IMG format on a different operating system?

No, the process described in this article is specific to Linux. If you are using a different operating system, you will need to find alternative methods or tools to convert the ISO file to IMG format.

Can I convert multiple ISO files to IMG format at once?

No, the geteltorito command can only convert one ISO file at a time. If you need to convert multiple ISO files, you will need to run the command separately for each file.

Can I specify a different output directory for the IMG file?

Yes, you can specify a different output directory by providing the full path to the desired directory along with the output IMG file name. For example, if you want to save the IMG file in the Documents directory, you would use the following command: geteltorito input.iso > /home/username/Documents/output.img.

Can I convert an IMG file back to ISO format?

Yes, you can convert an IMG file back to ISO format using the mkisofs command. However, the process is beyond the scope of this article. You can refer to the mkisofs man page for more information on how to perform this conversion.

Are there any other command-line tools available for converting ISO to IMG in Linux?

Yes, there are alternative tools available for converting ISO to IMG format in Linux, such as isohybrid and isomount. However, in this article, we focused on using the geteltorito command as it is widely available and commonly used for this purpose.

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