Generating Flutter app icons automatically

Coming from Ionic, it’s pretty straightforward to generate app icons for your app. While doing some research, I learned it’s easy for Flutter as well!

Today we’ll learn how to automatically generate App Icons for iOS and Android-based on one image source!

The idea is that apps need many different sizes of App Icons for all kinds of devices and resolutions. Yet, we don’t want to make all these images ourselves.

Adding the flutter_launcher_icons plugin

Flutter is built in a way we can easily add plugins. For this one, head over to your pubspec.yml file and add the following line to your dev_dependencies.

dev_dependencies:
  flutter_launcher_icons: '^0.8.0'

Then we need to install this plugin by running:

flutter pub get

Adding our app icon

For our base icon to work, I would suggest having a logo that is 1024x1024px in size. Also, don’t use alpha or transparency in this image (for iOS). For Android, you can use transparency.

However, for this demo, I’ll use one generic image.

Place this image in a folder called images at the root of your directory.

I made this basic image for my app icon just to demo how it will look.

Basic app icon

Head back over to the pubspec.yml file and add the following configuration.

flutter_icons:
  android: true
  ios: true
  image_path: 'images/icon.png'

We could also specify a specific image for iOS or Android:

flutter_icons:
  image_path_ios: 'images/icon-ios.png'
  image_path_android: 'images/icon-android.png'

To generate the icons, we can run the following command.

flutter pub run flutter_launcher_icons:main

Now when we run the application on our simulator, we should see the app icon we defined. I also opened up the Xcode assets to showcase all the different sizes that have been created.

iOS app icons in Flutter