Focus PDF Reader

Open a PDF. Then use Line, Ruler, or Box mode to keep a readable focus window over the page.

Controls: Space/Down = next, Shift-Space/Up = previous, click = jump highlight, G = jump to page, A = auto-size on/off, B = box mode, W = fit width.

This hosted version runs entirely in your browser. PDFs are opened from your device via the file picker and are not uploaded by the app.