How to split a photo for Instagram

Grid or carousel

The two look similar in a splitter and behave nothing alike once posted.

A profile grid is nine (or six, or twelve) separate posts. Anyone scrolling their feed sees them one at a time, as individual squares that make no sense alone. The full picture only exists on your profile page. It takes over your feed for nine posts, it breaks the moment you publish anything out of sequence, and it can only be undone by deleting posts.

A carousel is one post. Followers swipe through the slides in the feed, in order, and the picture stays intact forever. Instagram allows up to 20 slides in a carousel. It costs you one post instead of nine, and nothing you publish afterwards disturbs it.

For a panorama, a product line-up, or anything you want people to actually see, the carousel is the better instrument. Grids are for profile-page impact: a launch, an announcement, a portfolio header. Pick the grid when the profile page is the audience, and the carousel when the feed is.

What the 2025 grid change did to 3×3 grids

Instagram replaced its square profile grid with a portrait one in January 2025. Grid thumbnails are now 3:4, not 1:1.

This matters for grid splits in a way that is easy to miss. Cut a square photo into nine square tiles and post them, and the profile page does not show nine squares any more. It shows nine 3:4 thumbnails, each one a centred crop of your square tile with the top and bottom trimmed away. Your carefully aligned mosaic loses a horizontal strip out of every tile, and the pieces no longer meet at the edges.

There are two workable responses.

Split at 3:4 instead of 1:1. Make your source image 3:4 overall and cut it 3×3. Every tile then arrives at the grid’s native ratio and nothing is cropped. A 1080 × 1440 px source cut 3 × 3 gives tiles of 360 × 480 px, and a 3240 × 4320 source gives 1080 × 1440 px tiles, which is comfortably above what Instagram needs.

Split square and accept the crop. Keep the tiles at 1080 × 1080 px and design so nothing important sits near the top or bottom edge of any tile. The mosaic will not be pixel-perfect on the profile page, but for a photo with an out-of-focus background it often looks fine. Test it with one tile before committing to nine.

The exact figures, including what happens to landscape and 4:5 posts in the grid, are on Instagram grid size.

One thing the change did not break: the individual post. Tap any tile and Instagram shows it at its real aspect ratio, uncropped. The 3:4 crop is a thumbnail behaviour, not a re-save.

Posting order for a grid

Instagram places your newest post in the top-left slot of the profile grid and pushes everything else to the right and down. Upload nine tiles in reading order and the finished grid comes out reversed.

Post the bottom-right tile first. Then move left along the bottom row. Then the middle row, right to left. Then the top row, right to left, finishing with the top-left tile. When the ninth tile lands, the whole picture appears at once.

The splitter names your files in that sequence, so _1 is the first upload and _9 is the last. Sort the folder by name and work down.

Some practical points nobody mentions until it is too late:

• Do it in one sitting. Anything published mid-sequence, including a Reel, shifts every tile that comes after it.
• Reels count. They land in the grid alongside photos on most accounts, so a Reel posted between tile four and tile five breaks the picture the same way a photo would.
• Deleting is the only undo. There is no reordering. A tile posted out of sequence has to be deleted and re-posted, which pushes everything after it again.

If that sounds fragile, it is. Which is the honest argument for carousels.

Carousels: the first slide sets the rules

Instagram’s carousel has one behaviour that catches everybody: the first slide’s aspect ratio applies to the whole post. Every slide after it is cropped to match. You cannot mix a square slide and a portrait slide in one carousel.

For a split panorama this is the difference between a clean post and a mangled one. Cut a wide image into three and each slice comes out short and wide. Put them in a carousel whose first slide is 4:5 and Instagram crops the sides off all three.

The fix is to pad, not to crop. Each slice goes onto a taller canvas with a background of your choosing (white, black, a blurred copy of the slice’s own edge, or a colour you pick), so every slide already matches 4:5 before it reaches Instagram. A 1000 × 1000 slice becomes 1000 × 1250 px. Nothing is cut, and the bars read as a deliberate frame rather than a mistake.

Better still, size the source so no padding is needed. A 3240 × 1350 panorama cut into three gives slices of 1080 × 1350 px, which is exactly 4:5. Ten slides at the same height means a 10800 × 1350 source. Do the arithmetic once at the start and the padding question disappears.

Full dimensions for square, portrait, and landscape carousels are on Instagram carousel size.

Making a carousel run continuously across slides

A carousel where the artwork continues across the joins is one image split into equal vertical strips, with the strips posted in left-to-right order. The seamless carousel splitter does this in one step.

Two things decide whether it reads as one picture or as a stack of separate images.

Put the joins in busy areas. A cut through flat sky or a plain background shows every tiny difference in how Instagram rendered each slide, and reads as a visible line. A cut through detailed texture hides itself. Drag the split lines to move a join off an empty area.

Give every slide something to hold on its own. Instagram shows a preview of the next slide’s edge, and people swipe fast. A slide that is nothing but the middle of a gradient gives them no reason to keep going.

There is a limit worth knowing about: schedulers built on Meta’s publishing API often still cap carousels at 10 slides, because the API limit has not moved even though the app allows 20. If you plan a 15-slide carousel, post it from the app.

Mistakes that cost a re-upload

Starting from a small source. A 1080 × 1080 photo cut 3 × 3 gives tiles of 360 × 360 px, which Instagram then upscales. Start at three times the target: 3240 × 3240 for a square grid, 3240 × 4320 for a 3:4 grid.

Letting a cut land on a face. An even 3×3 grid puts a horizontal line across the eyes more often than chance would suggest. Drag the line before you export. Fifty pixels is usually enough.

Uploading tiles out of order. Sort by filename and post _1 first. Every splitter that hands you unnamed files is quietly making you do this by eye.

Screenshotting instead of exporting. A screenshot is a lower-resolution, re-compressed copy at whatever size your screen happens to be. Export the tile.

Splitting an already-compressed JPG and re-saving as JPG. Each pass costs a little detail. Export as PNG if you are going to edit the tiles afterwards, or keep the quality at 0.92 or above.

Assuming the grid preview matches the post. The profile thumbnail is a 3:4 crop; the post itself is not. Judge the mosaic on the profile page, and judge the individual image in the feed.

FAQ

How do I split a photo into 3 for Instagram?

Load the photo into the carousel splitter, choose 1×3, and download the three slices. Post them as one carousel in left-to-right order. For a profile grid instead, use 3×1 or 1×3 as a row and post the rightmost piece first, since Instagram fills the grid newest-first from the top-left.

What size should a photo be before splitting it for a grid?

Aim for at least three times the tile size you want. For a 3:4 grid that means around 3240 × 4320, which cuts into nine tiles of 1080 × 1440 px. Anything smaller gets upscaled by Instagram and looks softer than the original did on your screen.

Why does my Instagram grid look cropped?

Because the profile grid has been 3:4 portrait since January 2025 and centre-crops whatever you post. Square tiles lose their top and bottom in the grid view. Split a 3:4 source into 3:4 tiles instead, or keep important detail away from the top and bottom edges of each square tile.

Can I mix square and portrait slides in one carousel?

No. The first slide’s aspect ratio applies to the entire carousel, and Instagram crops every following slide to match it. If your slices are not all the same shape, pad them to a single ratio before posting rather than letting Instagram choose which edges to remove.

How many slides can an Instagram carousel have?

Up to 20 in the app, doubled from the old limit of 10. Third-party schedulers often still cap at 10 because Meta’s publishing API limit has not changed, so post longer carousels from the Instagram app itself if your scheduler refuses more than ten.

What happens if I post a grid tile out of order?

Everything after it shifts by one position and the picture breaks. Instagram has no reordering, so the only fix is deleting the offending post and re-posting the remaining tiles in sequence. Post all nine in one session and avoid publishing anything else, Reels included, until the last tile is up.