This tool crops your photo to standard 35×45mm passport size — that exact size is never altered — and tiles 12 copies (3×4) edge-to-edge on an A4 sheet at true 300 DPI, separated only by a thin dotted cut line. PDF/JPG/PNG exports are high-resolution RGB; most print shops convert to CMYK automatically at print time. It does not remove or replace your real background — pick a plain-background photo for best results.