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how to decompile an .apk file

step1 : go to "www.javadecompilers.com"
step2 : on the top left side select apk decompiler click on browse
step3 : select an .apk where you have stored in your computer.
step4 : click on upload and decompile (it will take some time to decompile)
step5 : it will open result page..click on save button and then save the decompile folder of an                   apk file.

below video shows how to decompile an .apk file