Split Image into Parts

If you are building an Instagram grid, post in reverse

This is the thing that goes wrong, and it goes wrong after you have done all the work.

Instagram's profile grid shows your newest post first, in the top-left position, filling left to right and then down. So the order you post in is the reverse of the order the pieces appear in.

To assemble a 3×3 image on your profile, post piece-3-3 first (the bottom-right corner), then 3-2, then 3-1, then work up through row 2, and post piece-1-1 last. The top-left piece of your image is the last thing you upload.

Which is exactly why the pieces here are named piece-1-1.jpg, piece-2-3.jpg and so on — row first, then column. You can read the order straight off the filenames instead of trying to remember which crop was which. Most splitters hand you 1.jpg through 9.jpg with no indication of position, and reassembling that by eye is genuinely difficult on an abstract image.

A carousel is the opposite. If you are making a swipeable panorama rather than a profile grid, the slides are added in natural reading order — leftmost piece first. Grids run backwards; carousels run forwards.

Check the preview before you cut

The cut lines are drawn over the image so you can see exactly where the splits land. Use them, because the composition decides whether a grid works.

What to look for: a line running through a face is almost always wrong, and it is the most common problem with a 3×3 grid of a portrait. A line through the middle of any single subject splits it across two posts that most people will never see side by side. And text cut across a boundary becomes unreadable in each individual piece.

If a cut lands badly, crop the image first to shift the subject, then split. Reframing before the split is far easier than trying to fix nine separate pieces afterwards.

Get the source dimensions right

The pieces inherit their shape from the source, so the source has to suit the destination.

For a profile grid, remember Instagram's grid thumbnails are square. So a 3×3 mural wants a square source image — then each of the nine pieces is square too and fills its cell exactly. Start with a wide photo and every piece will be a letterboxed rectangle inside a square slot.

For a carousel panorama, plan the other way round. Each slide displays at 1:1 or 4:5, so a three-slide panorama wants a source about three times as wide as one slide is tall. A 3240×1080 image split into three gives you three clean 1080×1080 slides.

Size generously. A 3×3 split of a 1080-pixel image gives pieces of 360 pixels each, which is below what Instagram wants for a single post — so the platform upscales them and they look soft. For a 3×3 grid, start from something around 3240 pixels square so each piece lands at 1080.

Other things people split images for

The grid is the popular use, and it is not the only one.

Printing large. Split a poster across several sheets of A4, print them, and tape them together — the row-and-column naming is what makes assembly straightforward. Equal halves is often all you need for a two-page spread.

Sprite sheets and tilesets. A sheet of game sprites or icons laid out on a grid splits cleanly into individual files, and the naming maps directly onto the original layout.

Splitting a scan of two pages. A book scanned as a single spread becomes two pages with Equal Halves (Vertical), which is quicker than cropping twice.

Comparison images. A before-and-after saved as one file separates back into two.

Grid, or halves

Grid is the default. The presets cover the common cases, and Custom takes any rows and columns from 1 to 10 — so 1 row by 5 columns gives you a horizontal strip, which is the setting for a carousel panorama.

Equal Halves does one cut, horizontally or vertically, with nothing to configure. Use it for a book spread, a before-and-after, or a two-sheet print.

The pieces come back as a ZIP. On a large grid that is a lot of files, which is another reason the naming matters.

What you get back

The pieces are JPEGs at high quality, which suits photographs. A transparent PNG comes back with white where the transparency was.

Everything happens on your own device — no upload, no account, no watermark, no size limit. Worth having given that most of what gets split is personal photography.

Related tools

Crop Image is the step before this when a cut line lands somewhere awkward — reframe first, then split. Collage Maker does the reverse, arranging several photos into one. Resize Image scales the source up before splitting so the pieces are big enough to post.