Doc Scanner is a free mobile application available for Android users that allows them to scan and digitize documents using their smartphones. This powerful scanner app comes with advanced features such as automatic document detection, image enhancement, and multi-page scanning to create high-quality digital copies of important documents on the go.

With Doc Scanner, you can scan color documents, photographs, images, and text. The app has various auto-correcting functions such as increasing brightness and filtering the image for better and higher quality output. You can enhance the scan quality automatically or manually and optimize your PDF into modes like B/W, Lighten, Color and dark.

The app allows you to arrange your documents in folders and sub-folders, share PDF/JPEG files, print and fax scanned documents directly from the app, and upload documents to the cloud like Google Drive, Dropbox, etc. Doc Scanner also has a QR Code/Bar-code scanning feature, which allows you to create and share scanned QR codes.

Overall, Doc Scanner is a must-have app for anyone who wants to scan and digitize documents on the go. It's a portable document scanner that offers third-party cloud storage where you can scan papers and save them on cloud storage. The app is easy to use and has all the features that a scanner should have, making it the best document scanner for Android users.