APK Extractor Master. Lists all the apps in the device. Upon clicking on any app, the apk file is saved in internal storage in the folder APKOutput. The choice of your app can be searched as well from the list of shown apps. Each app has share option too which will enable to share the apk file through mail,drive,whatsapp etc
Great app that will save you a lot of bandwidth from not having to re-download apps but instead saving them on phone. Very nice!