Overview

APK (Android Package) files are the package file format used to distribute and install applications on Android devices. APK files are essentially ZIP archives containing the app's code, resources, assets, and manifest file.

When you download an app from Google Play Store, you're downloading an APK file. The Android operating system then installs it on your device. APKs can also be sideloaded from other sources, though this carries security risks.

Did you know? APK files are ZIP archives - change the extension to .zip to explore the app's contents!

History

Development History

  • 2008: Android 1.0 introduces APK format
  • 2013: APK expansion files for large apps
  • 2018: Android App Bundle (.aab) supplements APK
  • 2021: Google Play requires App Bundles for new apps
  • Present: APK remains standard for app distribution

Features and Capabilities

Key Features

  • ZIP-based archive format
  • AndroidManifest.xml configuration
  • DEX files (Dalvik Executable) for code
  • Resources (images, layouts, strings)
  • Native libraries (.so files)
  • Digital signature for security
  • Version code and name
  • Permissions declaration
  • Multi-architecture support

Common Use Cases

Common Uses

  • App distribution: Google Play Store, alternative stores
  • Sideloading: Install apps outside Play Store
  • Beta testing: Distribute test versions
  • Enterprise apps: Internal company applications
  • App backup: Save installed apps
  • Development: Testing and debugging
  • Modding: Modified game/app versions

Advantages & Disadvantages

Advantages

  • Simple distribution format
  • Self-contained app package
  • Supports all Android versions
  • Easy to share and backup
  • Can be analyzed and modified
  • Offline installation possible
  • Multiple sources for obtaining

Disadvantages

  • Security risks from unknown sources
  • Larger size than App Bundles
  • All architectures included (wasted space)
  • Malware distribution vector
  • Can be decompiled easily
  • Manual updates required for sideloaded apps

Technical Information

APK files are ZIP archives containing all the resources needed to run an Android application.

Technical Specifications

File extension .apk
MIME type application/vnd.android.package-archive
Base format ZIP archive
Signature Required (V1, V2, V3)
Min Android version Android 1.0+
Maximum size 100 MB (Play Store)