APK Toolkit & Analyzer — Professional Local Android Package Inspector

Deep inspect Android APK files locally in your browser. Analyze DEX methods, native libraries (.so), resources, and binary AndroidManifest.xml. Convert AAB to APK and get actionable R8/Gradle optimization tips. 100% private, zero uploads.

Local-First Android Package Inspection in Modern Browsers

FileStudio's APK Toolkit brings professional Android build inspection and diagnostics straight to your web browser without requiring heavy desktop IDEs or cloud uploads. Built on secure client-side ZIP parsers and custom binary decoders, the analyzer reads Dalvik Executable (DEX) headers, binary compiled AndroidManifest.xml (AXML), ELF native shared libraries (.so), and compiled resources entirely in memory. Developers, security researchers, and QA teams can audit APK composition, permissions, SDK targets, and component trees with zero privacy risk.

Evidence-Based Size Optimization & Android 15 Readiness

App size directly influences Google Play install conversion rates. The APK Optimization Advisor evaluates actual package contents against Android best practices: identifying redundant multi-ABI bloat, uncompressed asset leaks, unminified MultiDEX code footprints, and debuggable release flags. With Google's mandatory 16KB memory page alignment for Android 15, the toolkit inspects ELF segment alignments across 64-bit native architectures, delivering exact build.gradle.kts and proguard-rules.pro snippets to remediate issues at the build source.

Honest AAB Conversion & Official Bundletool Integration

Need to test an Android App Bundle (.aab) on a physical device or emulator without running full Android Studio builds? The AAB to APK workspace parses bundle modules, strips bundle metadata, and packages a functional universal APK directly in the browser. For production builds requiring code signing and device-specific split APK sets, the tool instantly generates copy-paste CLI commands and downloadable shell scripts (.sh and .bat) preconfigured for Google's official bundletool.

Safe Asset Optimization & Full Privacy Protection

Graphics often account for over 40% of total APK download weight. Using browser-native Canvas and WebP encoders, developers can selectively compress heavy drawables and splash screens into high-efficiency WebP format, inspecting visual fidelity and byte reductions before committing changes back to their source repository. All session metadata is persisted securely in local IndexedDB with zero telemetry.

Frequently asked questions

Are my APK, AAB, or signing keys uploaded to any server?
No. FileStudio processes all Android packages 100% locally in your browser using client-side JavaScript, WebAssembly, and ZIP parsing. Your APK, AAB, keystores, and decompiled manifests never leave your machine.
How does the in-browser AAB to APK conversion work?
The tool inspects the Android App Bundle structure (base module, manifest, DEX, res, assets, and native libraries), removes bundle-specific protocol buffers, and packages an installable Universal APK directly inside your browser. For advanced multi-split APK sets or signed releases, you can also download ready-to-run Google bundletool scripts (.bat and .sh).
Can I convert an APK back into an Android App Bundle (AAB)?
Directly converting a compiled APK back into an official Play Store AAB is technically infeasible because compilation strips raw resource IDs, merges multi-module structures, and destroys the proto XML required by Google Play. Our tool explains this honestly and provides the exact Gradle commands (./gradlew bundleRelease) to build an AAB from your original Android source code.
Does this tool detect Android 15 16KB memory page alignment?
Yes! The native library inspector verifies ELF headers of all arm64-v8a and x86_64 shared libraries (.so) to confirm whether they satisfy the 16KB (0x4000) page alignment required by Android 15.
Can I optimize image assets inside my APK?
Yes. The Safe Asset Optimization tab lets you select heavy PNG and JPEG assets extracted from the APK and compress them into modern WebP format right in your browser, comparing before-and-after savings.

Related tools