Office Lens app allows users to trim, enhance and make pictures of whiteboards and documents readable. It can also convert images to editable Word and PowerPoint files too. Microsoft recently updated the Office Lens app for iOS and Android with a key improvement. You can now finally save PDF files without having to log in. This is a long-awaited feature, even if don’t have access to the Internet, you can quickly save PDF captures to your phone without a watermark.