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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.
Drag over the parts of a PDF you want hidden. Redacted pages are flattened to an image, so the text under the black box is gone for good — nobody can copy or extract it. It all runs in your browser, so your files are never uploaded.