Millimetres, not pixels
Split an image into A4 pages
A poster the size of a wall, printed on the printer you already own. Choose the paper, choose how many sheets, print, trim, tape.
- Runs in your browser
- Free, unlimited
- No watermark
Drop an image here
JPG, PNG, WEBP or GIF. Read by your browser, never uploaded.
Choose an imageor paste with Ctrl / ⌘ + V
Quick templates
Tile shape
Paper
Output format
Your tiles
How tiled printing works
Print mode stops thinking in pixels and starts thinking in paper. Each tile becomes one sheet, shaped to the printable area of the page size you pick, and the number of sheets decides how big the finished poster is. Thats why the tile shape chips disappear in this mode — a sheet of A4 is a fixed shape, so the tile follows the paper rather than a ratio you choose.
How big will it be?
Bigger than people expect. Worth holding a tape measure against the wall before committing to nine sheets.
| Sheets | Paper | Finished size |
|---|---|---|
| 2 × 2 | A4 portrait | 40 × 57 cm |
| 3 × 3 | A4 portrait | 60 × 86 cm — close to A1 |
| 4 × 4 | A4 portrait | 80 × 114 cm |
| 3 × 3 | A3 portrait | 85 × 122 cm |
| 2 × 2 | Letter portrait | 41 × 53 cm |
The margin is not decoration
No home printer prints to the edge of the paper — most leave 3 to 6 mm unprinted, some more at the bottom. Set the margin here to match what yours can do, and print one test sheet if you are not sure. Then trim: cut the margin off two sides of each sheet and leave it on the other two, so the trimmed edge overlaps neatly onto the next. Cut all four edges and theres nothing left to tape.
DPI, and being honest about it
300 DPI is the print standard, and its also more than most source images can supply once blown up to poster size. A nine-sheet A4 poster at 300 DPI is a canvas of about 7400 × 10200 px; a 24-megapixel camera gives you 6000 × 4000. 150 DPI is the honest setting for a photograph at A1, and nobody stands 20 cm from a wall poster anyway.
Assembling it
- Lay every sheet out in order before you cut anything. The row and column are printed in the corner.
- Trim the right and bottom margin off each sheet, leaving the left and top.
- Work from the top left, overlapping each new sheet onto the trimmed edge of the last.
- Tape from the back with matte tape — shiny tape catches the light and traces every seam.
- Mount it on card if its going up permanently. Paper this size ripples on a wall within a week.
Questions
How do I print one image across multiple pages?
Choose your paper and the number of sheets, then download the PDF. Each page is one sheet. Print at 100% scale rather than fit to page, or they won't line up.
What margin should I use?
Between 3 and 6 mm covers most home printers. If unsure, print one sheet and measure what actually reached the paper.
Should I use 150 or 300 DPI?
150 for photographs and anything viewed from a distance, 300 for scans, line art and text. Most photos don't contain enough detail for 300 at poster size anyway.
Do I overlap the sheets or butt them together?
Overlap. Trim the margin off the right and bottom of each sheet and lay it over the untrimmed edge of the next. Butting cut edges together leaves a white line wherever the cut wasn't perfect.
Why is my poster blurry?
The source didn't have enough pixels for the size you printed. Check the tile size on the mat — 900 px on an A4 sheet is about 110 DPI, and it will look soft up close.