PDF Poster Tiling
Print a large poster across several A4 sheets
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Split a large drawing or poster across several sheets of A4 with overlap and assembly marks
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About PDF Poster Tiling
This tool enlarges one PDF page and splits it across several sheets of A4, A3 or US Letter, so an ordinary home or office printer can produce an A1 or A0 poster, a floor plan or a banner proof. Neighbouring sheets repeat a strip of the image (the overlap) so there’s something to glue, and the unprinted border carries cut marks, dashed glue lines and tile names such as A1 and B2.
The page is not rasterised. It’s embedded once as vector content and each sheet shows only its own window onto it, so CAD drawings and illustration PDFs stay crisp at 400 % and the file barely grows.
How much of the poster one sheet really covers
The printable area on a sheet is the paper size minus twice the print margin. But because each sheet repeats the overlap from its neighbour, the distance it actually advances the poster is that area minus the overlap once more. With the defaults (10 mm margin, 10 mm overlap), a portrait A4 sheet prints 190 × 277 mm but advances the poster by 180 × 267 mm.
So the sheet count per direction is (poster size − overlap) ÷ advance, rounded up. With orientation on Auto, the tool works out both portrait and landscape and keeps whichever needs fewer sheets, preferring portrait on a tie. In “fit to sheets” mode it does the opposite and picks the orientation that gives the bigger poster.
Why printed tiles don’t line up
Almost always it’s “Fit to page” or “Shrink oversized pages” in the print dialog. That scales each tile down by a few per cent, and the error adds up across a row of seams. Print at “Actual size” or 100 %. The marks use plain ASCII in Helvetica so no font needs to be embedded, which is why they’re in English.
Photos and scans inside the PDF are not vector, so enlarging them doesn’t add detail. A photo prepared at 300 dpi for A4 becomes the equivalent of 75 dpi at 400 %, which looks soft up close.
Worked examples
An A3 poster blown up to A1 size (200 %)
- Input
One A3 page (297 × 420 mm), 200 %, 10 mm margin, 10 mm overlap, orientation Auto- Output
On A4: landscape 3 × 5 = 15 sheets / on A3: landscape 2 × 4 = 8 sheets
The finished poster is 594 × 840 mm. Portrait A4 needs (594 − 10) ÷ 180 → 4 across and (840 − 10) ÷ 267 → 4 down, 16 sheets. Landscape A4 advances 267 × 180 mm and needs 3 × 5 = 15, so Auto picks landscape. Printing on A3 roughly halves the count to 8, with far fewer seams to glue.
How to use it
- Open the PDF; the page count and first page’s real size in mm are shown.
- Choose paper, orientation and sizing (scale %, fit to a number of sheets, or finished size in mm) and check the preview grid.
- Save the tiled PDF, print at actual size, and assemble by the tile labels.
Frequently asked questions
How much overlap should I use?
About 10 mm is comfortable for gluing one sheet over the next. If you trim edges and butt-join sheets with tape on the back, 5 mm is enough. The maximum is 50 mm, and it must be less than half the printable area of the sheet.
Is there a limit on sheets?
Up to 500 sheets per run. Scale can be 10–2000 %, and a finished size 50–10,000 mm.
What about a multi-page drawing set?
Enter a page range such as 3 or 2-4, and each of those pages is tiled with the same settings.
Sources
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