CamScanner is best mobile scanning app, with its easy to use and user friendly interface. This is used by almost every college going students and office fellows.
It allows to scan, store and synchronise across various devices. Its best feature is smart cropping and text clearing features. You can share the scanned images that automatically converts the image into pdf.
We can also set password for the pdf the created, that makes your documents secure.
Its free version is ad-supported and enough to take advantages, but if you want to use is at severity you can purchase this at a rate 5$ a month or 50$ a year.
This is a revolutionary app and recommended too.
Thank you.