Turn one picture into overlapping A4 or Letter pages with trim marks, glue strips and page labels. Download one PDF. Runs on your device.
To print an image across several pages, cut it into page-sized pieces that overlap a little, print each piece at 100 percent scale and glue the pieces together. This tool does the cutting. You add a picture, choose either how many pages wide and tall the poster should be or how wide it should be in centimetres or inches, and it lays the picture over a grid of A4 or US Letter pages. The preview draws every page as a box with its label, and the shaded strips are the overlap. Then you download one PDF with a page for each piece. An assembly guide comes first by default: it shows the grid, the poster size and a 100 millimetre line you can measure to check that your printer did not shrink the pages.
Many printers leave a blank border, so the picture on each page covers only the safe area inside the margin you set, from 0 to 25 mm (borderless printing needs 0). With the default 10 mm margin, an A4 portrait page holds a 190 by 277 mm area. Neighbouring pages overlap by 10 mm by default, so each extra page adds 180 mm across or 267 mm down. Two pages across and two down therefore cover 370 by 544 mm. For a fixed poster width the tool counts the pages for you, and Auto direction tries portrait and landscape pages and keeps the layout that needs fewer pages. A 3 to 2 picture made 100 cm wide on A4 comes to 16 pages with the default settings. The limit is 100 pages, and the page images together must stay under 100 million pixels. A margin under 5 mm gets a warning, because some printers cut off the edge of the page.
When you choose the number of pages, the picture and the page grid rarely have the same shape. Whole picture keeps every pixel: the picture is scaled to fit inside the grid and centred, and the leftover space stays white. Pages that would carry no picture at all are not printed. Fill the pages scales the picture until it covers the whole grid and crops the edges that do not fit. When you choose the poster width instead, the picture is never cropped and the height follows from its shape.
A poster is only as sharp as the picture is large. The tool divides the picture's width in pixels by the poster width in inches and shows the result. A 3000 pixel wide photo spread over 370 mm (14.6 in) gives about 206 pixels per inch, which is fine for a poster read at arm's length. The same photo at 100 cm gives about 76. Below 150 pixels per inch the tool shows a warning, because the picture looks soft when you stand close. Photos are usually printed at 200 to 300 pixels per inch. The tool never makes a page image sharper than 250 pixels per inch on paper, so the PDF stays small, and it does not invent detail: a small picture stays small, only larger on paper.
Pages are labelled by row with a letter and by column with a number: A1, A2, A3, then B1, B2 and so on. Start with A1. For each other page, cut off the left and top margin along the crop marks and glue the page over the glue strip of the page to its left and above it, lining up the picture. The right and bottom strips of a page end up hidden under the next page. Finally trim the outer margin. Your picture stays on this device: it is cut into pages and written into the PDF by your browser, with no upload step. The tool cannot correct a printer that scales pages, so print at Actual size and check the 100 millimetre line first.
Add the picture, set the pages across and down (2 by 2 gives four A4 pages), download the PDF and print it at 100 percent. Cut the left and top margin off every page except A1 along the crop marks and glue the pages over each other's 10 mm strips.
It depends on the picture's shape. A 3 to 2 landscape picture 100 cm wide takes 16 A4 pages, 4 across and 4 down, with a 10 mm margin and 10 mm overlap. Choose Poster width, type 100 and the preview shows the exact count for your picture.
Aim for 150 pixels per inch or more. A 4000 pixel wide photo reaches 150 at a poster width of about 67 cm (26.4 in); at 100 cm it drops to about 102 and the tool warns you. A smaller poster or a larger picture fixes it.
The printer scaled them. Choose Actual size or 100 percent, not Fit to page, in the print dialog. The assembly guide has a line that must measure exactly 100 mm after printing; if it does not, the scale is wrong.
Yes. Choose Letter (8.5 by 11 in, 215.9 by 279.4 mm) or A4 (210 by 297 mm). Poster width can be typed in centimetres or inches, and switching the unit converts the number, so 60 cm becomes 23.62 in.
No. The picture is cut into pages by your browser, in this tab, and written into the PDF there. There is no upload step and no server that receives pictures. A JPEG, PNG or WebP works; a transparent area prints as white.