Decompile, edit smali code & resources, then rebuild your APK
Edit Dalvik bytecode (smali) to modify app behavior, patch methods, or remove checks.
Modify layout files, strings, colors, styles, and AndroidManifest.xml.
Recompile all changes into a working APK using apktool.
Sign the rebuilt APK with a debug key for testing on devices.
Encode, decode, measure sizes, and transform common formats.