Enlarge a photograph into a wall-sized poster
Turn a holiday photo, a picture of your dog or a wedding welcome board into a large print using a desktop printer. Photographs show seams more than flat artwork does, so this page defaults to a 10 mm overlap.
Load a file to start.
No upload — everything runs in your browser
How much resolution a photo poster needs
Quality is the real question with photographs. Viewed from a metre or more, 100 dpi is enough; up close you want 150. The 841 mm long edge of A1 needs about 3300 pixels at 100 dpi and about 4970 at 150. A recent phone shoots around 4000 by 3000, which is workable at A1 and comfortable at A2. The preview shows the enlargement percentage; if it climbs past 400 percent, consider dropping a size.
Why photographs want a 10 mm flap
Photographs are full of gradients — sky, walls, skin — where a one-millimetre step at a seam reads as a hard line. A 10 mm overlap lets the pattern blend across the shared strip even if the upper sheet goes down slightly askew. Hold the overlap up to the light, match the detail through the paper, and only then commit with double-sided tape.
Use matte paper, not gloss
Glossy paper looks wonderful on a single sheet, but on an assembled poster the raised seams catch the light and every join announces itself. Matte or heavy plain paper scatters the light instead and hides the steps. Inkjet matte A4 costs a few cents a sheet, so eight sheets is under a dollar.
Welcome boards and wall displays
This works for wedding welcome boards, which are usually around A1, birthday panels and shop window displays. Rather than enlarging a bare photograph, compose the type over the image in any editor, export a flat image and load that, which saves fighting a layout program. If the display comes down later, tape it to the wall with low-tack tape rather than mounting it, so nothing is left behind.
Frequently asked questions
Is a phone photo good enough?
Yes. About 4000 pixels on the long edge gives roughly 120 dpi across an A1 poster, which is fine for anything viewed from a metre away. Smaller images push the enlargement up and the edges start to look soft.
How do I make the seams disappear?
Three things help most: an overlap of 10 mm or more, matte paper instead of gloss, and a clean straight cut on the sheet that goes on top. A ragged scissor cut casts a shadow along the join, so use a knife and a steel rule.
Is my photo sent anywhere?
No. Decoding, slicing and PDF writing all happen in your browser. Family photographs and client images never leave the machine.