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Sign-in and file saving are blocked inside LINE. Open the page in Safari to use every feature.
Tap the menu (⋯) button and open this page in Safari or Chrome instead. You can sign in there.
Photograph a document with your phone or webcam, clean it up in black and white, and save it as a PDF. Several shots go into one file, in the order you set. It all runs in your browser, so nothing is uploaded.