AI & TechnologyGoogle Play 16 KB Page Size: Fixing Flutter and Android Apps

If Play Console warns that your app doesn't support 16 KB memory page sizes, the fix is usually a newer Android Gradle Plugin and NDK, plus updated native dependencies. Google requires apps targeting Android 15 and higher to support 16 KB pages on 64-bit devices, and says that starting February 1, 2027, updates without it can't be released. In my experience every Flutter Android app ships native code, so Flutter apps are in scope, and Flutter 3.38 is the first version that defaults to the NDK Google's fix needs.

The facts below come from Google's page-size guide, Google's May 2025 announcement, Flutter's 3.38 release post and Flutter's source code, as listed in the sources. I checked each one on October 18, 2026.

Disclosure: App369 is my studio. I build and fix Android and iOS apps, mostly in Flutter, and the last section mentions what I sell. Google doesn't pay me for anything on this page.

The requirement and the dates

The guide, last updated October 16, 2026, is the newer source, so I'd plan around February 1, 2027 and check Play Console for any warning on your own app.

Google's guide also explains why: devices with more memory are moving to 16 KB pages, and without recompiling, apps won't work on 16 KB devices in future Android releases. On a 16 KB device today, an app with 4 KB-aligned .so files that are stored uncompressed in the APK can run in a backcompat mode that shows a warning when it first launches.

Who is affected

Only apps with native code: .so files in the APK's lib folder. That includes apps that use native code through an SDK or library, not just apps you wrote C or C++ for. In my experience, every Flutter Android release build has native libraries in that folder: libflutter.so for the engine and libapp.so for your compiled Dart code. Analyze APK, below, shows them.

Check your app

Google's guide lists three checks:

1. Analyze APK in Android Studio. Open Build > Analyze APK, pick the APK and look in the lib folder. The Alignment column shows warnings for files with alignment problems.
2. check_elf_alignment.sh on Linux or macOS. Run it on the APK. It reports whether each library is aligned.
3. zipalign for zip alignment. Google's example uses the copy in build-tools 35.0.0:

   zipalign -v -c -P 16 4 APK_NAME.apk
   

Fix it

Google's shortcut: if you update to AGP 8.5.1 or higher and NDK r28 or higher, and your prebuilt dependencies are 16 KB compatible, the app is 16 KB compatible by default.

Flutter apps

Flutter's 3.38 post calls upgrading "essential preparation" for the 16 KB requirement and says NDK r28 is the minimum for the alignment.

What to do in a Flutter app:

1. Upgrade Flutter to 3.38 or later, or set ndkVersion in android/app/build.gradle to an r28 version if you can't upgrade yet. My advice: upgrading is safer, because Flutter's 3.38 post lists a set of Gradle, AGP and Kotlin versions that Flutter tested together.
2. Check the AGP version in android/settings.gradle (or the buildscript block on older projects). It needs to be 8.5.1 or higher.
3. Update plugins that ship native libraries. My advice: after building, run Analyze APK and look at every .so file. A plugin with an old prebuilt library is the usual reason an app still fails after the Flutter upgrade.
4. Test on a 16 KB emulator. Google's guide covers Android 15 emulator images with 16 KB page sizes. My advice: install a build there and make sure it starts without the compatibility warning.

If the Flutter upgrade breaks the Android build first, see the v1 embedding fix and the Gradle plugin fix. Google Play also requires new apps and updates to target API 36 since August 31, 2026: see the target API 36 guide.

Need a hand?

If Play Console flags your app for 16 KB page sizes, or an update fails after the fix, the App Fix Ticket covers it in two fixed-price steps. A $450 Diagnosis gives you the root cause with evidence and a fixed repair quote within 3 business days, credited toward the fix. If you go ahead, the $1,200 Fix takes 5 business days and comes as a pull request. Or send me a short description.