8 Free & Best Android Scanner Apps Of 2018 To Save Documents In High Quality. Retrieving digital documents, and manipulating and saving them into various formats is a big part of law practice. Every lawyer should have a document scanner on her desk. My favorite is the ScanSnap IX500, which is a workhorse, and which I use many times every day. But, when I am out and about, or traveling, I don't want to carry a large scanner with me. If you need to scan on the run, you should be aware that the best portable scanner apps for smartphones have gotten much better, and my favorite, Microsoft Lens, is free to use, and scans to many places that Microsoft supports. OneNote, Word, you name it, and you can take a photo, save the document as a PDF file, and then make it anything you want. Don't buy a portable scanner. You don't need it. Use the scanner in your pocket.