How do I make a flag for a fictional country?
Start with what the country cares about and turn that into one symbol and two or three colors. Then pick a layout that fits its history or neighbors, such as a tricolor, a Nordic cross or a canton. Build it in Flag Maker and download it for your book, game or map.
Real flags often share layouts for a reason. The Nordic countries all use an offset cross, and Australia and New Zealand both carry the Union Jack in the canton. If your fictional nation has allies, a common layout tells readers that without a word of exposition.
Give the symbol a story you can explain in one line. The fictional country flag guide covers worldbuilding tips, and the flag design ideas guide shows layout families with real examples. Then try a few versions in the flag maker.