Image Splitter
Cut a picture into an even grid, a carousel that continues as people swipe, or a poster you print across ordinary sheets of paper. The lines move as you adjust them, and nothing is uploaded.
Drop an image to split it
Cut it into a grid, a swipeable Instagram carousel, or a poster you print across sheets of paper. Nothing is uploaded.
How to split an image
Open your image
Drop a photo, choose one, or paste it. It is read in your browser and never uploaded.
Choose how to split it
An even grid of tiles, an Instagram carousel or profile grid, or a poster printed across sheets of paper.
Adjust the cut
Set rows and columns, the number of slides and their shape, or the paper size, pages across, margin and overlap. The lines move as you change them.
Download
Tiles come as one ZIP, named in order. A poster comes as one PDF with an assembly guide on the first page.
Three ways to split a picture
An even grid
Up to 12 rows and 12 columns, cut at the original resolution with no scaling, so nine tiles from a 3000 by 2000 pixel photo are each 1000 pixels wide and 666 or 667 pixels tall. Use it for a puzzle, a set of matching thumbnails, a sprite sheet cut back into single images, or a large scan you need to send in pieces. When the size does not divide evenly, the spare pixels are shared out so no tile is more than one pixel bigger than another.
An Instagram carousel or profile grid
A carousel panorama cuts one wide picture into two to ten slides of the same shape, so the scene runs on as people swipe. A profile grid cuts it into rows of three, so the posts form one big picture on your profile. Drag the image to choose exactly what fills the frame; the parts outside are dimmed.
| Shape | Tile size | When to use it |
|---|---|---|
| Square 1:1 | 1080 × 1080 | Classic grid posts and square carousels |
| Portrait 4:5 | 1080 × 1350 | The tallest shape Instagram's help lists for feed photos; the safe choice for a carousel |
| Tall 3:4 | 1080 × 1440 | Matches the tall previews many profile grids now show; check how a test post looks on your account first |
A poster printed across sheets of paper
The same idea as The Rasterbator and Block Posters, done in your browser: choose A4, Letter, A3 or Legal, how many pages across, the margin your printer leaves blank and an overlap for gluing. The tool works out how many pages down, how big the finished poster will be and how sharp it will look, then builds one PDF with a numbered assembly map on the first page and cut marks on every sheet.
How big a poster you can make
Poster size depends on the number of sheets. Sharpness depends on how many pixels the photo has to spread across that size, measured in pixels per inch. These are the numbers for an ordinary 12 megapixel phone photo, 4032 by 3024 pixels, printed on sideways pages with a 6 mm margin and 6 mm overlap:
| Pages across × down | Sheets | Finished poster | Pixels per inch |
|---|---|---|---|
| 2 × 2 Letter | 4 pages | 52.9 × 39.7 cm (20.8 × 15.6 in) | 194 ppi |
| 3 × 3 Letter | 9 pages | 79.0 × 59.3 cm (31.1 × 23.3 in) | 130 ppi |
| 4 × 4 Letter | 16 pages | 105.2 × 78.9 cm (41.4 × 31.1 in) | 97 ppi |
| 3 × 4 A4 | 12 pages | 84.3 × 63.2 cm (33.2 × 24.9 in) | 121 ppi |
| 4 × 5 A4 | 20 pages | 112.2 × 84.2 cm (44.2 × 33.1 in) | 91 ppi |
How many pixels per inch you need depends on how far away people stand. A healthy eye separates details about one sixtieth of a degree apart, which works out to this:
| Viewing distance | Pixels per inch to look sharp | Typical use |
|---|---|---|
| Held in your hands, 30 cm | about 290 ppi | Photo prints, cards |
| On a desk, 50 cm | about 175 ppi | Small posters |
| Across a room, 1 m | about 87 ppi | Posters on a wall |
| 1.5 m | about 58 ppi | Large posters |
| 2 m | about 44 ppi | Banners, very large prints |
So a poster that hangs on a wall only needs around 90 pixels per inch, a third of what a photo print needs. The tool shows the figure for your image and flags it when the poster will look soft from close up.
Getting the pieces to line up
- Print at 100 percent. In the print dialog choose Actual size or 100 percent. Fit to page shrinks each sheet slightly and the edges stop meeting.
- Keep the margin. Most home printers cannot print right to the edge of the paper. A margin of a few millimetres keeps every part of the picture on the page.
- Use the overlap. Trim one sheet along its cut marks and lay it over the next sheet's overlap strip, shown as a dashed line. Glue or tape from behind.
- Follow the map. Pages are labelled by row letter and column number, A1 at the top left, matching the map on the first page of the PDF.
- Watch the last row. If the bottom row is only a thin strip, turning the pages the other way or adding one page across usually saves paper.
Frequently asked questions
Other tools you might need
Poster figures assume a 4032 × 3024 pixel photo on landscape A4 (297 × 210 mm) or Letter (11 × 8.5 in) pages with a 6 mm margin and 6 mm overlap. Viewing distances use the common one arcminute limit of visual acuity, which gives pixels per inch = 3438 ÷ distance in inches. Instagram shapes follow our image sizes guide.