A4 QR-sticker sheet generator (self‑adhesive). Generates multi-page 300 DPI PDFs with 2×3 blocks (105×99 mm) per sheet. Supports 4 stickers (2×2, 42×38 mm) or 9 stickers (3×3, 28×25 mm) per block. Each sticker includes a large QR code and an 8‑digit numeric label.