Print a PDF as a poster on multiple pages
Poster tiling splits one PDF page across a grid of ordinary printer sheets — 2×2, 3×3 or 4×4 — so you can print a large poster on a home printer and join the sheets afterwards. This tool renders your chosen page at high resolution, slices it into tiles with a configurable overlap strip, and marks each tile with dashed alignment lines and its grid coordinate. Everything runs locally in your browser; the PDF is never uploaded.
How it works
The tool first renders the page you pick — not the whole document — to an off-screen bitmap at a resolution high enough for the target grid, so a 4×4 poster gets roughly four times the pixel density of a single printout. Rendering happens with the same engine your browser uses to display PDFs, which means vector line art, gradients and embedded fonts are rasterized cleanly at the enlarged size rather than being scaled up from a screen-resolution preview.
Next it computes the tile geometry. The source bitmap is divided into an N×N grid, and every interior edge is extended by the overlap you choose (10 mm by default). That means each tile carries a duplicated strip of image along the edges it shares with neighbors: the right edge of tile A1 repeats on the left edge of tile B1. On those overlap edges the tool draws a dashed alignment line showing exactly where the neighboring sheet should sit, and it prints the tile's coordinate (for example "B2 — column 2, row 2") in a corner so a shuffled stack of sheets can be re-ordered without guesswork.
Finally each tile is placed on its own output page at a fixed physical scale and the tiles are written into a new PDF, one sheet per page. The scale is the critical part: the math assumes every sheet leaves the printer at exactly the size the tool computed. That is why you must choose 100% / "Actual size" in your print dialog. If the driver applies "Fit to page" or "Shrink to printable area", every sheet is scaled by a slightly different few percent, the duplicated strips no longer coincide, and seams accumulate a visible offset by the time you reach the far corner of the poster.
Assembly is then mechanical: trim or fold the unprinted margin on the overlapping edge, line the dashed guide up with the printed edge of the neighboring sheet, and glue or tape. Working row by row from the top-left tile keeps cumulative error smallest.
Illustrative example: an A4 concert flyer to a 3×3 wall poster
Illustrative scenario, not a recorded benchmark. File sizes, timings and results depend on the input and device. Try the reproducible samples.
A one-page A4 concert flyer (a 1.8 MB PDF, mostly vector text and shapes) is tiled at 3×3 with the default 10 mm overlap. The tool renders the page at high resolution and produces a nine-page output PDF of about 6.4 MB. Printed on A4 at 100%, each sheet holds one ninth of the artwork plus overlap strips; after trimming the overlaps the assembled poster measures roughly 63 × 89 cm — about the size of a standard B1 movie poster, at a paper cost of nine ordinary sheets. The same flyer at 2×2 gives about 42 × 59 cm (A2-ish), and at 4×4 about 84 × 119 cm (A0-ish). Text that was 30 pt on the original page appears roughly 90 pt tall on the 3×3 assembly and stays sharp because it was rasterized at the enlarged size, not blown up from a small preview.
Frequently asked questions
Why must I print the tiles at 100% (Actual size)?
The tiles are computed so that adjacent sheets share an identical overlap strip at exact scale. Any "Fit to page" or "Shrink to printable area" option rescales each sheet by a few percent, so the strips no longer match and the joined image drifts out of alignment.
How big will my poster be after assembly?
Each grid multiplies the sheet's usable area: a 3×3 grid of A4 sheets in portrait yields roughly 63 × 89 cm once overlaps are trimmed, close to a B1 poster. The tool shows the assembled dimensions before you download.
What is the overlap strip for?
Home printers cannot print to the paper edge, and scissors are never perfectly straight. The overlap repeats a band of the image on both neighboring tiles so you can glue one over the other and hide small cutting errors.
Will the tiles stay sharp when the page is enlarged this much?
The chosen page is rendered at high resolution before slicing, so vector artwork and text stay crisp at typical poster viewing distance. Photos are limited by their original embedded resolution and may soften on 4×4 grids.
Can I tile more than one page of the PDF at once?
No, poster tiling works on one chosen page per run, since a poster is a single image. Run the tool again with a different page number to tile another page.
Is my PDF uploaded to a server to be tiled?
No. The page is rendered, sliced and re-assembled into a new PDF entirely by JavaScript in your browser, and the file never leaves your device.