Split an Image Into A4 Pages

Choose how many A4 sheets wide you want the finished picture and the splitter above works out the rest. Two sheets across is the default. It lays the image over the pages with overlap and cut marks and exports one PDF ready to print at 100 percent scale.

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Your image never leaves your device. Splitting runs in your browser with the Canvas API.

What two A4 sheets across gives you

Sheet counts, finished sizes and dpi computed by the same paperLayout function the PDF export uses.
A 4000 × 3000 photo4 sheets, 2 across × 2 down, 39.0 × 29.3 cm (15.4 × 11.5 in), 261 dpi
A 3000 × 4000 portrait4 sheets, 2 across × 2 down, 39.0 × 52.0 cm (15.4 × 20.5 in), 195 dpi
A 6000 × 4000 camera photo2 sheets, 2 across × 1 down, 39.0 × 26.0 cm (15.4 × 10.2 in), 391 dpi
A 1920 × 1080 screenshot2 sheets, 2 across × 1 down, 39.0 × 21.9 cm (15.4 × 8.6 in), 125 dpi
PaperA4 portrait, 210 × 297 mm (8.3 × 11.7 in)
Overlap between sheets10 mm, repeated on both sheets so you can trim one and lay it over the next
Printer margin5 mm on every edge, the border a home printer cannot print into
Printable area per sheet200 × 287 mm (7.9 × 11.3 in)

A4 is 210 × 297 mm, which makes it easy to reason about in multiples. Two sheets across in portrait gives 420 mm of width before trimming, roughly A2. Three gives 630 mm. Four gives 840 mm, which is about A0 across. Because A sizes halve neatly, an A4 tiling lands close to a standard poster size without much arithmetic.

This preset works from sheets across rather than from a target width, which is the easier way round when the paper is what you have and the finished size is negotiable. Say two sheets across and the number of sheets down follows from the shape of your image. A 4000 × 3000 photo across two A4 portrait sheets comes to 6 sheets (3 across × 2 down). Turn the paper landscape and the same picture comes to 9 sheets (3 across × 3 down), which is often fewer sheets for a wide image.

Overlap is the part that makes it work. Trimming is on the printed cut lines, one edge per sheet, and the repeated strip of image gives you room to slide the sheets until they match before taping.

One setting outside this tool decides whether any of it lines up: the print dialog. Fit to page shrinks every sheet slightly and the joins drift by a millimetre each time. Set scale to 100 percent or actual size.

The PDF is built in your browser and your image is never uploaded.

What this split is used for

A2 or A1 poster from A4 sheets

Two A4 sheets across gets you near A2, four gets you near A0. Because the A series halves cleanly, tiling A4 lands close to a standard frame size without odd trimming. Choose the sheets across, check the reported dpi, and print the PDF at 100 percent scale.

Wall chart or revision poster

Timetables, revision material and reference charts are more useful large. A4 is the paper most people have, and a two by three tiling makes something readable from across a room. Print on the heaviest stock your printer takes so the taped sheets hang flat.

Scale drawing on ordinary paper

Setting sheets across gives a predictable finished width, which matters when a drawing has to print at a known scale. The overlap and cut marks keep the measurements consistent across joins rather than accumulating a millimetre of error at each one.

Banner for an event

Six or eight A4 sheets in landscape tiled into a long strip makes a banner for a stall or a classroom door. Landscape sheets mean fewer vertical joins across a wide design, which is both faster to assemble and less visible from a distance.

Tips

  • A4 is 210 × 297 mm, so two sheets across in portrait is about 420 mm before trimming.
  • Landscape A4 usually needs fewer sheets for a wide image, so try both orientations.
  • Set the print dialog to 100 percent or actual size, never fit to page.
  • Trim one edge per sheet on the cut line and overlap it onto the next.
  • Assemble one row at a time, then join the rows, so alignment error does not build up.

Frequently asked questions

How do I split an image into A4 pages?

Set how many A4 sheets wide you want it in the splitter above. The number of sheets down follows from the shape of your image. It adds overlap and cut marks and exports a single PDF, which you print at 100 percent scale and tape together after trimming.

How big is A4?

210 × 297 mm, which is 8.3 × 11.7 inches. The A series halves along the long edge, so A3 is two A4 sheets, A2 is four and A1 is eight. That is why tiling A4 sheets lands close to standard poster sizes without awkward trimming.

How many A4 pages do I need for a poster?

It depends on the finished size and the shape of the image. A 4000 × 3000 photo two A4 sheets across takes 6 sheets (3 across × 2 down). At four sheets across, which is roughly A0 width, it takes 15 sheets (5 across × 3 down). The count appears before you export.

Should I use portrait or landscape A4?

Match the paper to the picture. A wide image usually needs fewer sheets in landscape, a tall one in portrait. Switching orientation changes both the sheet count and where the joins fall, so it is worth checking both before you print anything.

Why do my A4 pages not line up when taped?

The usual cause is the print dialog scaling the pages. Fit to page shrinks each sheet by a percent or two, which is invisible on one page and obvious across six. Set scale to 100 percent. The other cause is trimming both edges instead of one.

Can I get the pages as separate images instead of a PDF?

Yes. The same tiling can export as individual image files rather than a single PDF, which suits sending pages to someone else or printing them from a different application. The PDF is simply the version that keeps the page size and margins fixed for you.