How many photos to put in a collage

The slot count is the first real decision, and it is not the same as the number of photos you happen to like. Here is how to choose it from what the pictures are, not from how many there are.

Every extra photo is paid for by the others

A collage is a fixed area. Put two pictures in a square and each gets half of 1080 by 1080; put nine in and each gets a ninth. Nothing else changes — not the file size, not the shape, not how long anyone looks at it — so the only real question is how much room each picture needs in order to still be doing its job.

That is a question about content, and it has a rough answer. A face needs about 300 pixels across before an expression survives being looked at in a feed. A wide landscape needs to stay wide, which means it needs a slot that is wider than it is tall. Text in a photograph — a sign, a menu, a birthday card — needs far more than either, and usually should not be in a collage at all.

Slot width in a 1080 × 1080 square, even layouts, gap 12
Slots	Cell size	Good for
2	522 × 1056	Two strong pictures, before and after
3	344 × 1056	One subject, three distances
4	522 × 522	A set of equals
6	344 × 522	Faces, if they are close-ups
9	344 × 344	Pattern, texture, a day in thumbnails

Why three and six flatter people

Odd counts and uneven layouts both do the same thing: they give one picture more room than the rest, and the eye reads that as the subject. Four equal squares give the eye nothing to settle on, so it treats all four as a list. That is the right treatment for four plates of food and the wrong one for four pictures of a person.

Six is the interesting case. An even six is a list, but most of the six-slot layouts here are not even — three pairs weights the middle row, a lead picture with five around it weights the top left, and the zigzag alternates. Six with a weighted slot handles a family occasion better than four square does, because there is usually one photograph everybody wants to see and five that set the scene.

A quick way to decide

Lay your pictures out in your camera roll and ask which one you would send if you could only send one. If there is a clear answer, use an odd or uneven layout and put that picture in the big slot. If there is not, the set is a set, and an even grid is honest about that.

Where the ceiling is, and why

Twelve photographs is the most this tool will hold, and nine is the most that usually makes sense. The limit is not arbitrary: every photo you open is decoded into memory in this tab, and a phone browser will quietly kill a tab that asks for too much. Working copies are made small immediately to buy room, and twelve is where that stops being comfortable on the phones this is mostly used on.

The design limit bites earlier than the technical one. Past nine, each cell is under a third of the frame and the collage becomes a pattern — which can be lovely, but nobody is going to identify anybody in it. If you are heading that way deliberately, a tool that lets you place each picture yourself will serve you better than a fixed template will.

Two photos is a real answer

Nobody searches for a two-photo collage and yet it is the most useful count in the set. Before and after, two ends of a day, two people who were not in the same room — two slots give each picture half the frame, which is enough to look at properly. Four of the thirty layouts here hold exactly two, and the lead pair, where one gets about two thirds, is the one worth trying first.