Format APK (Android Application Package) is a standard package for distributing and installing applications on devices running management Android. Without it, it is impossible to download the app to Google Play, test it on a real device, or share it with beta testers. But how do you turn source code or even a ready-made application from the store into an installation file? The methods depend on your role: the developer will collect an APK from the project in Android Studio, and an ordinary user can extract it from the installed software - although this violates the license agreements of most applications.

In this article we will analyze the creation of APKs, from official to alternative, taking into account their pros, cons and potential risks. We will pay special attention 5 working methods creating APKs, from official to alternative ones, taking into account their pros, cons and potential risks. We will pay special attention file signatures (without it the APK will not install), size optimization and bypassing restrictions Google Play Protect. If you are a beginner, start with the pro section - this is the safest and most legal way. Experienced users will also find more advanced techniques here, including decompilation and online services. Android Studio This is the safest and most legal way. Experienced users will also find more advanced techniques here, including decompilation and online services.

⚠️ Attention: Extracting APKs from other people's applications (especially paid ones) may violate Google Play terms of use and copyright laws. This material is for educational purposes only. For testing, use only your own projects or open source applications.

1. Build APK in Android Studio (official method)

Android Studio is the main tool for developers, and building an APK here takes just a few clicks. The method is suitable for creating debug (debug) and release (release) versions of a file. The first option is signed automatically with a temporary key and is only suitable for testing, and the second requires a manual signature - without it your application will not be accepted. Google Play will not accept your application.

To generate an APK:

  • 📌 Open your project in Android Studio and wait for synchronization Gradle.
  • 🔧 In the top menu, select Build → Build Bundle(s) / APK(s) → Build APK.
  • ⏳ Wait for the build to complete (the progress is displayed at the bottom of the screen).
  • 📁 The finished file will appear in the folder app/build/outputs/apk/debug/ (for debug version).

For release version you must first create a signature key via Build → Generate Signed Bundle or APK. Here select APK (not Android App Bundle), specify the path to the key file (.jks or .keystore) and password. Keep the key in a safe place - without it, you will not be able to update the application on Google Play!

Install the latest SDK updates|Check the file build.gradle for errors|Create a signing key for the release version|Disable unnecessary libraries to reduce the size of the APK-->

⚠️ Attention: If you use Android App Bundle (AAB), Google Play automatically generates optimized ones APK for different devices. But for manual installation on devices or testing outside the store, you will still need a separate APK.

2. APK generation via Gradle (for automation)

If you need to build APKs frequently (for example, for CI/CD), it is more convenient to use Gradle a build system integrated into Android Studio. The commands are launched via the terminal and allow you to flexibly customize the process, including the choice of build (debug/release), architecture (armeabi-v7a, arm64-v8a) and other parameters.

Basic commands:

  • 🛠️ Build a debug APK: 
    ./gradlew assembleDebug
  • 🔐 Build a release APK (requires a pre-configured signingConfig): 
    ./gradlew assembleRelease
  • 📦 Build an APK for a specific architecture (for example, only arm64): 
    ./gradlew assembleArm64-v8aRelease

The finished files will appear in the same folder app/build/outputs/apk/, but with a more detailed structure (for example, release/, arm64-v8a/). This method is convenient for scripts and build servers where there is no graphical interface.

💡

To reduce the size of the APK, add the build.gradle flag to minifyEnabled true and configure proguardRules to remove unnecessary code.

3. Extracting an APK from an installed application

If you already have an application installed on your device, you can extract its APK without the source code. This is useful for backup or analysis (for example, to check what permissions the app requests). data-i="95">Extraction methods: Distributing extracted APKs from third parties violates Google Play policies.

Extraction methods:

  • 📱 Via file manager: Use Root Explorer or Solid Explorer (with root access) to copy the file from /data/app/ (path may differ in new versions of Android).
  • 💻 Via ADB: Connect the device to the PC and run the command: 
    adb shell pm path com.example.app

    Then copy the file to the received path:

    adb pull /path/to/base.apk
  • 📲 Specialized applications: APK Extractor or App Cloner (available on Google Play) allow you to save APK directly from the phone screen.

⚠️ Attention: The extracted APK may not install on another device if:

  • The application uses split APKs (several files for different architectures).
  • The file is signed with a key associated with a specific device (for example, in banking applications).
  • The Android version on the target device is lower than the minimum specified in AndroidManifest.xml.

Backup applications|Testing on different devices|Code analysis (reverse engineering)|Distributing your application|Other-->

4. Online services for converting projects to APK

If you do not have Android Studio or you are working with a simple project (for example, on Kotlin Playground), you can use online tools. They are suitable for building APKs from source code or even from project archives (.zip). Popular services:

Service Support Restrictions Cost
AppBundle Explorer APK, AAB, source code Max. 100 MB, no signature Free
BuildAPK Java/Kotlin projects No support for natives (C++) From $5 per build
APKOnline Decompilation and modification Risk of viruses in downloaded files Free

⚠️ Attention: Online services can:

  • 🔍 Store your code on their servers (risk data leaks).
  • 🚫 Do not support the latest versions Gradle or Android SDK.
  • 💣 Embed advertising or malicious code in the final APK.

We recommend using such tools only for test projects or if you are ready to check the resulting APK through VirusTotal and decompile it to check the code.

How to check an APK for viruses?

Upload the file to VirusTotal or use MetaDefender. Pay attention to the detection rate: if more than 3-4 antiviruses mark an APK as dangerous, do not install it. Also check permissions in AndroidManifest.xml through a decompiler JADX - suspicious permissions (for example, REQUEST_INSTALL_PACKAGES in a non-game application) may indicate malware.

5. Decompilation and modification of APK (advanced level)

If you need to do more than just extract an APK, but edit it (for example, for localization, removal of advertising or security testing), you will need reverse engineering tools. This method requires knowledge Java/Smali and accuracy - one mistake can break the application.

Popular tools:

  • 🔄 Apktool: Decompiles APK into sources (smali) and resources, allowing them edit and assemble back. 
    apktool d app.apk -o output_folder

    apktool b output_folder -o modified.apk

  • 🔍 JADX: Converts .dexfiles into readable Javacode (convenient for logic analysis).
  • 🎨 APK Editor: A app with a graphical interface for replacing resources (icons, lines, images).

After modifying the APK you need re-sign, otherwise it will not install. To do this, use:

jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore mykey.keystore modified.apk alias_name

⚠️ Attention: Modification of other people's APKs can:

  • 🛡️ Violate license agreements (for example, Google Play Terms of Service).
  • 🚨 Act as "malware". Google Play Protect as "malware".
  • 🔧 Break protection mechanisms (for example, DexGuard or ProGuard).
💡

Decompilation is useful for training and security testing, but distributing modified APKs without the author's permission is illegal.

6. Alternative methods: Emulators and cloud IDEs

If you have a weak PC or are unable to install Android Studio, you can build an APK via:

  • ☁️ Cloud IDEs: Gitpod or GitHub Codespaces allow you to run Android Studio in a browser. The downside is limited resources for building large projects.
  • 🖥️ Emulators: Genymotion or BlueStacks can be used for testing, but not for building APKs (only for extracting from installed applications).
  • 🤖 Termux: Terminal for Android, in which you can install OpenJDK i Gradle to build directly on the phone (for advanced users).

⚠️ Attention: Cloud solutions may charge for computing resources. For example, GitHub Codespaces provides free hours, but large projects may require a paid plan.

Comparison of methods: Which one to choose?

Method Complexity Suitable for Risks
Android Studio ⭐ Developers, testers No (official method)
Gradle ⭐⭐ Automation, CI/CD Configuration errors
Extract from device ⭐ Backup License violations
Online services ⭐⭐ Quick proof of concept Code leakage, viruses
Decompilation ⭐⭐⭐ Analytics, modification Legal consequences

Optimal for most tasks first method - Android Studio. It guarantees correct assembly, support for all functions and safety. Online services and decompilation should be used only in extreme cases, when there are no other options.

💡

If you are developing an application for Google Play, be sure to test it through Android App Bundle (AAB) - this is a modern format that generates optimized APKs for each device.

FAQ: Frequently asked questions about creation APK

Is it possible to create an APK without source code?

Yes, but with limitations. You can extract the APK from an installed application (see section 3) or use decompilation (section 5). However, without the source code, you will not be able to:

  • Change the logic of the application (only resources like text or images).
  • Update dependencies or libraries.
  • Fix errors in the code.

To fully work with the project, you always need the source code.

Why is my APK not installed?

The reasons may be different:

  • 🔑 Missing signature: Release APKs must be signed. Use jarsigner or Android Studio for signature.
  • 📱 Incompatible architecture: If your device is on arm64, and the APK is built only for x86, installation will not will succeed.
  • 📜 Version conflict: If the device already has a version with the same packageName or higher versionCode.
  • 🛡️ Blocking Google Play Protect: Modified APKs may be recognized as malicious.

Check the installation logs using adb logcat for diagnostics.

How to reduce the size of APK?

Several methods:

  • 🗑️ Turn on minifyEnabled true i shrinkResources true in build.gradle.
  • 🖼️ Optimize images (use WebP instead of PNG, compress via TinyPNG).
  • 📦 Remove unnecessary libraries (check dependencies via ./gradlew dependencies).
  • 🌍 Use Android App Bundle — Google Play will generate optimized APKs for each device.
Is it possible to unpack the APK and change it?

Technically yes, using Apktool or JADX (see section 5). However:

  • 🔒 Most applications are protected from modifications (ProGuard, DexGuard, signature verification).
  • ⚖️ Changing other people's APKs violates copyright and can be prosecuted by law.
  • 🛡️ Modified APKs are often are blocked Google Play Protect or antiviruses.

For legal editing, use the source code or get permission from the author.

How does an APK differ from an AAB (Android App Bundle)?

APK is a universal installation file that contains all the code and resources for all architectures and languages. AAB is a more modern format, which:

  • 📦 Allows Google Play to generate optimized APKs for each device (for example, only the desired architecture and language).
  • 📉 Reduces the size of the downloaded file by the user.
  • 🔧 Supports dynamic delivery of functions (Dynamic Feature Modules).

Since 2021 Google Play requires downloading new applications in this format .aab, but APK is still needed for manual installation (sideloading).