Poster Printer — Print a Big Image on Multiple Pages
Split a photo or picture across several A4, Letter or photo-paper sheets and glue them into a large poster — with overlap, cut lines and sheet labels.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
A home printer usually tops out at A4 or US Letter, yet a poster for a wall, a classroom map, a birthday banner or a reference chart needs to be far bigger. The classic workaround is tiled printing: split the picture into pieces that each fit one sheet, print them, trim the edges and glue the sheets together. This tool does the splitting for you, right in the browser, and hands back a print-ready file.
Choose the paper you actually have — A4, A3, A5, Letter, Legal, a custom sheet, or 10 × 15, 13 × 18 and 9 × 13 cm photo paper — and decide how big the poster should be. Either say how many sheets wide it is, and the height follows the picture's proportions, or pick a finished size such as A2, A1, A0, 50 × 70 or 60 × 90 cm. The same works in reverse for small paper: if a photo should become a full A4 print but you only have 10 × 15 photo paper, pick A4 as the finished size and the photo paper as the sheet. With automatic orientation the tool tries portrait and landscape sheets and keeps whichever needs fewer of them.
The live preview shows the whole grid before anything is printed: every sheet's printable area, the shaded glue strips where neighbours overlap, the finished size in centimetres and the real print resolution. That last number matters most. A poster stretched far beyond the source image looks soft, so the tool rates the resolution and warns when the picture is too small for the chosen size, while it is still cheap to pick a smaller poster.
Home printers cannot print to the very edge, so a printer margin keeps the image inside the printable area, and the overlap repeats a strip of picture on neighbouring sheets so no white seam appears after gluing. Optional dashed lines show where to trim and where the next sheet's edge goes, and sheets carry a label such as A1 or B2 plus a tiny map of the whole grid, printed where the overlap allows in the strip that ends up hidden under a neighbour, so the pieces go back together in the right order. Download a multi-page PDF in real millimetres for printing at 100% scale, or a ZIP of PNG images to print at a photo kiosk. JPG photos usually go into the PDF byte-for-byte and PNG stays lossless, and nothing is ever uploaded.
Frequently asked questions
Why does my printed poster come out smaller than the preview says?
The printer scaled the pages. In the print dialog choose "Actual size" or 100% scale instead of "Fit to page" — the PDF is laid out in real millimetres, and any fitting shrinks every sheet and misaligns the glue strips.
How much overlap should I use?
About 10 mm is easy to trim and glue by hand, and it hides small cutting errors. With 0 the pictures meet exactly at the alignment line with no room for error — fine for borderless photo paper, or when you tape the sheets together from the back.
What printer margin should I set?
Most home printers cannot print the outer 3–5 mm of a sheet, so 5 mm is a safe default. Photo printers with borderless mode can go to 0. If the image gets cut off at the edges after printing, increase the margin.
How big can I make a poster before it looks blurry?
Watch the resolution line under the preview. Around 200 DPI and above looks sharp in hand; 120–200 DPI is fine for a wall poster seen from a step back; below that pixels become visible. A 12-megapixel phone photo is sharp up to roughly A3 and fine from a distance at A2.
In which order do I glue the sheets?
Rows are letters and columns are numbers: A1 is the top-left sheet, A2 is next to it, B1 is under A1. Cut the white border off the left and top of each sheet along the dashed line, then lay it over its left and upper neighbours so the cut edge meets their dashed alignment line. The picture in the overlap is printed on both sheets, so match it up and glue.