Personalizing the smartphone interface starts with choosing the background of the desktop, and for owners of the popular Redmi 9 model, this process opens up great opportunities for creativity. Standard images preinstalled by the manufacturer often seem boring or quickly boring, so users tend to find unique pictures that reflect their nature. The MIUI operating system on which the device operates has several ways to replace graphics, each of which has its own features and nuances.
The background replacement procedure does not require any technical knowledge or root access rights, which makes it available even to beginners: you can use photos from your personal gallery, download ready-made packages from a formal store or set up automatic changes to your schedule. Understanding the logic of the design system will allow you not only to change pictures, but also to optimize the screen operation, saving battery power.
In this article, we will take a look at all the installation methods available, focusing on hidden features and possible problems faced by Xiaomi users. We will look at how to properly prepare a file so that it does not stretch, and what formats the system supports.
Image Preparation and Format Requirements
Before you start installing it directly, you need to make sure that the image you choose matches the specifications of the Redmi 9 display. The screen of the smartphone has a resolution of 1080 × 2340 pixels with an aspect ratio of 19.5:9, and using a smaller picture will cause blurring or pixelation. If you plan to download an image from the Internet, look for files marked Full HD or higher so that the quality remains crisp even when you look at it in detail.
The file format also plays an important role: MIUI works best with JPG and PNG extensions. Avoid using heavy files larger than 10-15 MB, as this can lead to delays when switching between desktops or unlocking the device. For static images, the optimal weight of the file is considered to be up to 5 MB, which provides instant rendering of the interface without loading on the processor.
⚠️ Warning: Avoid using images with very bright white areas around the edges of the screen, as on the screen IPS-In the Redmi 9 matrix, this can visually distort the boundaries of icons and reduce the readability of widgets.
If you take a photo from a personal gallery, the built-in editor will allow you to frame the picture to the desired size before installation. It is recommended to leave a margin at the edges so that important details of the composition are not blocked by hours or application icons. Processing the image in advance saves time and nerves, eliminating the need to repeat the procedure multiple times.
Installation of wallpaper through the gallery and system settings
The easiest and most obvious way to replace the background is to use the standard Gallery app, which is preinstalled on all Xiaomi devices. Open the desired image, click on the menu button (usually three dots or a gear), and select Set as wallpaper. The system will suggest setting up the framing area, after which you can apply the picture to the main screen, lock screen or both.
An alternative way is through the settings menu, where you focus all the personalization options. Go to Settings → Wallpaper to access the advanced functionality. Here you will see not only your saved photos, but also access to the online directory, as well as the slideshow settings, which is preferable if you want to see a preview of how the image will look in conjunction with the icons.
When you select an image source, the system will offer several options: System Wallpaper, Online Wallpaper, and Local. When you choose a local file, you access the device's memory. It's important to note that when you install through settings, you have the option to customize the image behavior on the lock screen separately, including depth and blur effects.
Working with the “Themes” application and online directory
The official Themes app is a powerful tool often underestimated by Redmi 9 owners. Unlike a simple gallery, the content here is already optimized for your screen resolution and is being tested for security. The catalog offers thousands of free options, from minimalist abstractions to complex artwork created specifically for the MIUI interface.
Accessing advanced search sometimes requires you to change the region in your phone settings to India or Nepal, as in some regions the directory may be limited. After changing the region (via Settings → Additional Settings → Region), reboot the theme app. You can find unique collections that are not available by default for your geographic location.
💡
Use tag search in the Topics app by entering queries in English, such as “Nature”, “Abstract” or “Cars” to find better content.
Installation through the app is done in one click: find the set you like, click Download, and then Apply. The advantage of this method is that the themes often contain not only wallpaper, but also consistent icons, notification sounds and system window styles, which allows you to create a holistic visual style of the device, rather than just replacing one picture.
Slideshow setup and wallpaper carousel
The Wallpaper Carousel (or Glance) feature is a MIUI shell feature that allows you to automatically change images on the lock screen. Every time you pick up your phone, you see a new picture with a short description or a news note, which turns the lock screen into a news feed, but requires the right setup to avoid annoying the user.
To activate, go to Settings → Wallpaper → Wallpaper Carousel. Here you can choose the frequency of changes of images: each time you turn on the screen or according to a schedule. You can also adjust categories so that the system offers only those topics that you are interested in, such as “Travels”, “Cities” or “Technologies”.
How to turn off advertising in the wallpaper carousel?
In a limited mobile internet environment, it is better to set a content download limit, and this feature may have a slight effect on the device’s unlock speed in the first seconds after waking up.
Use of live wallpaper and its effect on the battery
Live Wallpapers are animated backgrounds that respond to touching or changing the position of a smartphone in space. On Redmi 9 with its Helio G80 processor, using complex animations should be a measured decision. Beautiful visuals like flowing water or floating clouds are created in real time and load the device's GPUs.
The main disadvantage of live wallpaper is increased battery consumption. If battery life is critical for you, it is better to refrain from using constant animation on the desktop. However, if you are willing to put up with a little more frequent charging for the sake of aesthetics, the system provides several built-in options that are optimized better than third-party counterparts.
| Wallpaper type | Impact on the battery | RAM load | Recommendation |
|---|---|---|---|
| Static (JPG/PNG) | Minimum | Low. | Recommended for all |
| Complex living. | High. | Tall. | Only when fully charged. |
| Simple living. | Average. | Medium | For powerful models |
| Video wallpaper | Very high. | Tall. | Not recommended |
If you do decide to install live wallpaper, choose options with minimal detail and rare frame rates. Avoid installing video wallpapers through third-party apps, as they often run in the background, constantly consuming CPU resources. For Redmi 9, the optimal compromise will be static wallpaper with simulated depth (parallax effect), which move when the phone is tilted, but do not require constant rendering of complex frames.
Solution: Wallpaper stretched or not applied
Users often experience a beautiful image stretching after installation, losing proportions, or the system refuses to use it at all. The problem with stretching is usually the aspect ratio of the source file to the screen. The built-in cropper (a framing tool) sometimes gets confused when installed, suggesting the wrong allocation area.
To fix this, open the image in the gallery before installing, select Edit → Cover and manually set the proportions as close as possible to the smartphone screen. If the problem persists, try rotating the image 90 degrees before installing, and then in the area selection menu, return it to the desired position - this trick often helps the system to correctly determine the boundaries.
☑️ Checklist for eliminating errors with wallpaper
If the wallpaper is not applied and an error flies out, check the free space in the device’s memory. The graphics subsystem cache needs at least 500 MB of free space to work correctly. Also, cleaning the Themes and Gallery app cache through the application management menu can solve the problem of hanging the installation process.
⚠️ Note: If you use a third-party launcher (desktop shell), the system settings of the wallpaper may not apply.
Third-party applications for advanced users
For those who lack standard functionality, there are specialized applications from Google Play, such as the Wallpaper Engine or Backdrops. They allow you to use huge databases of high-quality images, including support for 4K and HDR. However, installing such programs on Redmi 9 requires caution due to the aggressive energy saving policy in MIUI.
The system can automatically close the background processes of such applications, which can cause wallpaper to be reset to standard ones after rebooting, so to avoid this, you need to go to the battery settings, find the installed application, and select the "No Limits" mode, which allows the program to run stably and change the wallpaper on a schedule or event.
💡
Third-party applications give more freedom, but require manual permissions setup in MIUI for stable operation.
Using widgets in conjunction with custom wallpaper can create a unique interface. For example, transparent watch widgets look great in dark, deep backgrounds. Experiment with combinations, but make sure that the application icons remain readable and contrasting relative to the selected background.