Let’s get your Flutter app signed so you can upload it to the Google Play Store.
By default, Flutter builds unsigned APKs, but Play Store requires a signed release.

Here’s the step-by-step

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Step 1: Create a Keystore

Open Command Prompt (CMD/PowerShell) and run (replace your_name and your_company):

keytool -genkey -v -keystore C:\Users\<YourUsername>\my-key.keystore -alias my-key-alias -keyalg RSA -keysize 2048 -validity 10000

• It will ask for a password → remember it
• It will generate a file my-key.keystore

Make sure to keep this file safe and backed up — you’ll need it for every future update of your app.

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Step 2: Move Keystore to Project

Move my-key.keystore to your Flutter project, e.g.:

my_app/android/app/my-key.keystore

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Step 3: Configure key.properties

Create a new file inside android folder:
android/key.properties

storePassword=your-password
keyPassword=your-password
keyAlias=my-key-alias
storeFile=my-key.keystore

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Step 4: Update build.gradle

Open android/app/build.gradle and add this near the top:

def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file("key.properties")
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}

Then inside android { signingConfigs { ... } }, add:

signingConfigs {
    release {
        keyAlias keystoreProperties['keyAlias']
        keyPassword keystoreProperties['keyPassword']
        storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
        storePassword keystoreProperties['storePassword']
    }
}

And inside buildTypes { ... } update release:

buildTypes {
    release {
        signingConfig signingConfigs.release
        minifyEnabled true
        shrinkResources true
        // optionally enable proguard if needed
    }
}

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Step 5: Build Signed APK/AAB

Now run:

flutter build apk --release

Output:

build/app/outputs/flutter-apk/app-release.apk

Or for Play Store AAB:

flutter build appbundle --release

Output:

build/app/outputs/bundle/release/app-release.aab

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Now your APK/AAB is signed and ready to upload to Google Play Console