Clear Scanner is another good and lightweight app to scan documents or images to save that in digital format. You can scan documents and images to JPEG and PDF sending on your need. This is fast and even supports Cloud Print. You also get several editing features if you need.
Read full content : Free Scanner Apps For Android & iOS
TurboScan is the powerful and full featured Android scanner app. It allows you scan and share multipage documents in high-quality JPEG and PDF formats. It also supports multipage editing features such as page adding, reordering, and deleting. It is light weight app and works fast.