A file with .tar.gz extension is a file that has been compressed using the Gzip method and packaged in the Tar format.
This format is commonly used on Unix-based operating systems, such as Linux.
Here are some applications that can be used to create .tar.gz files.

1. 7-Zip

7-Zip is a free and open source application that can be used to compress and extract various types of files, including .tar.gz. Here is how to create a .tar.gz file using 7-Zip¹:

• Select the file or folder you want to compress.
• Right-click and select ‘Add to archive’.
• For the archive format, select ‘tar’.
  The compression level is indeed ‘Store’, save only.
  The rest leave the default.
• There will be a new archived file with a tar extension.
• Next, right-click again on the archive file above, select ‘Add to archive’.
• This time select the ‘gzip’ archive type.
  The compression level can be set by yourself (Ultra for maximum), everything else is default.
• Wait for the process to complete.

2. Zamzar

If you don’t want to install additional applications, you can use an online service like Zamzar to create a file .tar.gz. Here are the steps²:

• Go to tar.gz converter website: www.zamzar.com
• Select ‘Add Files’
• Then select the files you want to compress into tar.gz.
• Then click ‘Convert to’ and select tar.gz.
• Then click the ‘Convert Now’ button and wait for the loading to finish.
• After the converting process is complete, then click the ‘DOWNLOAD’ button
• You will then be redirected to a page asking you to choose either a .zip or tar.gz file.
  Then select the tar.gz file and click the ‘Download’ button.

With the above two methods, you can easily create a .tar.gz file either using an application installed on your computer or online without the need to install additional applications. Good luck! 😊