Photo Collage Maker

A collage tells a whole story in one picture: a trip, a before-and-after, a product range, a family event. This maker arranges 2 to 12 photos in a grid, side by side, stacked, as one large photo with smaller ones, or as a strip, at a social-media or print size, with the spacing, border, rounded corners and background colour you like. Everything is assembled in your browser.

How to use this tool

1. Choose 2–12 photos in the order they should appear.
2. Pick a layout — Auto grid adapts to any number of photos — and a collage size such as 1080 × 1080 for Instagram or 4 × 6 in for printing.
3. Set the spacing between photos, the outer border, the corner radius and the background colour.
4. Choose whether photos fill their cells (cropping the edges) or show whole with bars, then download the JPG or PNG.

Formula

Cell width = (W − 2·border − (columns − 1)·spacing) ÷ columns

Cell heights work the same way with rows. A cell spanning k columns is k·cell width + (k − 1)·spacing wide. “Fill” scales each photo by the larger of cell width ÷ photo width and cell height ÷ photo height and crops the centre; “whole photo” uses the smaller factor and centres it. Auto grid uses about √(n × W ÷ H) columns and widens the cells of a shorter last row.

Example

Four photos in a 2 × 2 grid on 1080 × 1080 px with a 24 px border and 12 px spacing get cells of (1080 − 48 − 12) ÷ 2 = 510 × 510 px. A 4000 × 3000 px landscape photo is scaled by 510 ÷ 3000 = 0.17 to 680 × 510 px and 85 px is trimmed from each side.