Set the finished poster width and the paper you have, and the splitter above tiles your image across enough sheets to reach that size. It adds overlap for taping and cut marks for trimming, then exports one PDF. A 840 mm wide poster on A4 is a common starting point.
Drop an image here
or , or paste with Ctrl+V
JPG, PNG, WebP, GIF, BMP and AVIF, up to 50 MB.
Drag any line to move a cut. Tab to a line and use the arrow keys to nudge it one pixel, or hold shift for ten.
Vertical cuts give side-by-side pieces. Horizontal cuts stack them.
The tool picks the rows and columns that keep the pieces closest to square.
A shared strip on each seam, so the sheets can be trimmed and taped.
Each piece is resized to the size this page targets before it is saved.
Your image never leaves your device. Splitting runs in your browser with the Canvas API.
| A 4000 × 3000 photo | 15 sheets, 5 across × 3 down, 84.0 × 63.0 cm (33.1 × 24.8 in), 121 dpi |
|---|---|
| A 3000 × 4000 portrait | 25 sheets, 5 across × 5 down, 84.0 × 112.0 cm (33.1 × 44.1 in), 91 dpi |
| A 6000 × 4000 camera photo | 10 sheets, 5 across × 2 down, 84.0 × 56.0 cm (33.1 × 22.0 in), 181 dpi |
| A 1920 × 1080 screenshot | 10 sheets, 5 across × 2 down, 84.0 × 47.3 cm (33.1 × 18.6 in), 58 dpi |
| Paper | A4 portrait, 210 × 297 mm (8.3 × 11.7 in) |
| Overlap between sheets | 10 mm, repeated on both sheets so you can trim one and lay it over the next |
| Printer margin | 5 mm on every edge, the border a home printer cannot print into |
| Printable area per sheet | 200 × 287 mm (7.9 × 11.3 in) |
| Watch the resolution | 3000 × 4000 portrait at 91 dpi; 1920 × 1080 screenshot at 58 dpi. Under 100 dpi a print is soft at reading distance, so either print it smaller or start from a larger file. |
A poster is defined by the size it ends up, not by how many pieces it takes to get there. So this preset starts from the finished width and works backwards.
Useful sizes to aim at. A1 is 594 × 841 mm and A0 is 841 × 1189 mm, which is why the default here is 840 mm wide: an A0-width poster built out of A4 sheets. In inches, 18 × 24 and 24 × 36 are the two most common US poster sizes, with 27 × 40 being the film poster size.
How many sheets that takes depends on the shape of your image as well as the width. A 4000 × 3000 photo at 840 mm wide on A4 portrait comes to 15 sheets (5 across × 3 down). The same photo at 594 mm comes to 8 sheets (4 across × 2 down). Switch to A3 and it drops to 6 sheets (3 across × 2 down).
Resolution decides whether the size is realistic. A poster viewed from a few feet away holds up at around 150 dpi. Something people will stand in front of wants closer to 300. The tool shows the effective dpi for the width you ask for, which is the honest answer to "can I print this that big".
Overlap and cut marks come as standard, because a poster made of twelve sheets has a lot of joins and every one of them is a chance to be a millimetre out.
The PDF is generated in your browser.
One good photo at A0 width turns a wall into a feature. Check the reported dpi first: a 12 megapixel phone photo at 840 mm wide is fine from across a room and disappointing close up. Matte paper hides the joins between sheets better than gloss does.
Printing a poster in-house at A1 or A0 width from a design file costs a fraction of a print shop order. Export as PDF so type stays vector-sharp through the tiling, and keep the important lettering away from the sheet joins where the tape will sit.
Reference material is most useful at a size people can read standing up. Setting a target width in millimetres keeps a map or a plan at a known scale across the joins, which matters if anyone is going to measure anything on it.
A scan or photo of a drawing printed at poster size is a cheap and genuinely good present. Low resolution matters less here, since the marks are already loose. Print on the heaviest paper your printer takes so the taped sheets do not curl off the wall.
Set the finished width and your paper size in the splitter above. It tiles the image across enough sheets to reach that width, adds overlap and cut marks, and exports one PDF. Print at 100 percent scale, trim on the marks, then tape the sheets from the back.
It depends on the finished width, the paper size and the shape of your image. A 4000 × 3000 photo at 840 mm wide takes 15 sheets (5 across × 3 down) on A4 portrait, and only 6 sheets (3 across × 2 down) on A3. The count is always shown before you export anything.
In the ISO series, A1 is 594 × 841 mm and A0 is 841 × 1189 mm. In the US, 18 × 24 inches and 24 × 36 inches are the common poster sizes, with 27 × 40 inches used for film posters. Set whichever width you want as the target.
Around 150 dpi is generally enough for a poster viewed from a few feet away, and closer to 300 dpi for anything people will inspect at arm's length. The tool reports the effective dpi for the size you have chosen so you can judge before printing.
That is exactly what tiling is for. An ordinary A4 or Letter printer produces the sheets, and the overlap and cut marks make them join cleanly. The only real limit is patience: a 24-sheet poster takes a while to trim and tape.
Trim one edge of each sheet on the printed cut line, lay it over the untrimmed edge of its neighbour, slide until the picture matches, then tape from the back. Working across one row at a time and then joining the rows keeps the alignment error from accumulating.