Viewnior is an image viewer application, created to be simple, fast and elegant. Its minimalistic interface provides more screen space for your images. Among its features are:

  • Fullscreen & Slideshow
  • Rotate, flip, crop, save, delete images
  • Animation support
  • Browse only selected images
  • Navigation window
  • Set image as wallpaper (under GNOME, Fluxbox and LXDE)
  • Simple interface
  • Configurable mouse actions

So, if you are looking for a reliable alternative to the Debian’s default Eye of Gnome image viewer, Viewnior is a wise choice. In this article, we will explain how to install Viewnoir to your Debian, both through the command line and the Software Manager. We will also tell you how you can configure Debian to use Viewnior as the default image/photos viewing application.

We have run the commands and procedures mentioned in this article on a Debian 10 Buster system.

Install Viewnior through the Command Line

Viewnior is easily available through the official Debian repository and can be installed through the command line using the apt-get command.

Open the Terminal application by pressing the Super(Windows) key and searching for it through the Application Launcher as follows:

Open the Terminal

The next step is to update your system’s repository index through the following command:

$ sudo apt-get update

Update Debian package lists

This helps you in installing the latest available version of a software from the Internet. Please note that only an authorized user can add, remove and configure software on Debian.

Now you are ready to install Viewnior; you can do so by running the following command as sudo:

$ sudo apt-get install viewnior

Install Viewnior

The system might ask you the password for sudo and also provide you with a Y/n option to continue the installation. Enter Y and then hit enter; the software will be installed on your system. The process may, however, take some time depending on your Internet speed.

You can check the version number of the application, and also verify that it is indeed installed on your system, through the following command:

$ viewnior --version

Check Viewnior version

Install Viewnior through the UI

Alternatively, you can use the Debian Software Manager through the UI to install Viewnior as follows:

On your Debian Activities toolbar/Dock, click the Software icon.

Open Ubuntu software installer

In the Software Manager, click the search icon and then enter Viewnior in the search bar. The search results will list the relevant entries as follows:

Select Viewnior package

The Viewnior entry listed here is the one maintained by the Debian Stable Main repository. Click on this search entry to open the following view:

Install Viewnior

Click the Install button to begin the installation process. An authentication dialog will appear for you to provide your authentication details.

Authenticate as admin

Please note that only an authorized user can add/remove and configure software on Debian. Enter your password and click the Authenticate button. After that, the installation process will begin, displaying a progress bar as follows:

Installing software

Viewnior will then be installed on your system and you will get the following message after a successful installation:

Launch Viewnior

Through the above dialog, you can choose to directly launch Viewnior and even Remove it immediately for whatever reason.

Launch Viewnior

You can launch the Viewnior application by entering the keywords “viewnior” in the Application Launcher Search bar, as follows:

Viewnior Icon

You can also use the following command in the Terminal to launch the application:

$ viewnior

This is how Viewnior looks like when no image is open:

Viewnior Image viewer

You can use the settings menu, as displayed above, in order to open an image by browsing for it.

As mentioned before, Eye of Gnome is the default image viewer for Debian. Therefore, whenever you open an image, it will open in the Image Viewer/EOG. In this case, if you want to open an image in Viewnior, right click on an image and select Open with Other application, and then select Viewnior from the list of applications as follows:

Recommended applications

Make Viewnior your default Image Viewer

If you prefer Viewnior over the default image viewer, you can set it as your default photo viewing tool through the Settings utility. The easiest way to do so it to search for “default applications” in the Application Launcher as follows:

Default applications

When you open the listed result entry, it will open the Settings utility in the Details>Default Applications view as follows:

Default image viewer

In the Photos drop-down, select Viewnior and it will now be set as your default photo viewing tool.

Set Viewnior as the default image viewer in Debian GNOME desktop

After reading this article, you can easily install Viewnior on your Debian through a preferred method. If you are satisfied with the application, you can set is as the default Photos application in place of Eye of Gnome/Image Viewer.

How to make Viewnior your default Image Viewer in Debian 10