A mobile wallpaper is a computer wallpaper sized to fit a mobile device such as a mobile phone, personal digital assistantor digital audio player. The height is often greater than or equal to the width. Wallpapers can typically be downloaded at no cost from various websites for modern phones (such as those running Android, iOS, iPhone 7 Wallpaper, iPhone 8 Wallpaper, iPhone X Wallpaper or Windows Phone operating systems). Modern smartphones allow users to use photos from the web in Supreme Iphone Wallpaper; or photographs captured with a phone camera can be set as a wallpaper.

A wallpaperor background(also known as a desktop wallpaper, Supreme Desktop Wallpaper, desktop background, desktop pictureor desktop imageon computers) is a digital image (photo, drawing etc.) used as a decorative background of a graphical user interfaceon the screen of a computer, mobile communications device or other electronic device. On a computer it is usually for the desktop, while on a mobile phoneit is usually the background for the home or idle screen. Though most devices come with a default picture, users can usually change it to custom files of their choosing.

Wallpaper was the term used in Microsoft Windowsbefore Windows Vista(where it is called the desktop background), while macOScalls it desktop picture. (Previously, the term desktop patternwas used to refer to a small pattern that was repeated to fill the screen.)

Wallpaper images are usually copyrighted as many other digital images found on the Internet, and as such, most websites collecting and sharing wallpapers, as well as the users downloading from them are an example of mass copyright infringement, a phenomenon which challenges the meaning and illegality of digital piracyand the validity of current copyrightlegislation around the world.

A live wallpaper is a type of application that works on a mobile device using the Android operating system. The application works as a wallpaper providing the background image for the home screen but also works as a conventional application since it can provide user-interaction with the touch screen (allowing the image to change dynamically, for example) and access other hardware and software features within the device (accelerometer, GPS, network access, etc.).

Similar functionality could be found in the Active Desktopfeature of Windows 98and later versions. There is also third party software that provides this feature for various operating systems.