Turn your favourite photos into a premium wall poster. Upload 4 photos to create a collage poster print, with white borders separating your photos. Choose your size: A4, A3, A2, A1, A0, or square 30×30cm, 50×50cm and 70×70cm. Choose your finish: Gloss for rich, vibrant colour, or Satin for a softer, glare-free look. Premium paper & printing. Every poster is printed on heavyweight 190gsm professional photo paper - available in gloss or satin - using large-format inkjet printers with instant-dry technology for sharp detail and rich, long-lasting colour. For indoor use only. Size guide Size Dimensions (mm) A4 210 × 297 A3 297 × 420 A2 420 × 594 A1 594 × 841 A0 841 × 1189 30×30cm 300 × 300 50×50cm 500 × 500 70×70cm 700 × 700 Artwork & bleed. For best results supply your artwork at 300 DPI or higher (600 DPI is better), sized to your chosen paper size plus 3mm bleed on every edge. Around 3mm is trimmed off during production, so keep important parts of your design away from the very edge.