Minecraft
Banner Designer
Looms show the result and hide the command. Once you have a banner you like, you will want to hand copies out — so design it here and take the /give line with you.
In 1.20.5 item components took over from item NBT. A server accepts only the syntax of its own era and rejects the other outright.
Layers, bottom of the list on top
Looms stop at six layers. Commands can go further, but such a banner can no longer be copied or repaired in-game.
Preview
Your command
/give @p minecraft:white_banner[banner_patterns=[{pattern:"minecraft:stripe_bottom",color:"red"}]] 1Advertisement
How it works
Every banner is a base colour plus as many as six pattern layers on top, each with its own dye, and the command spells that list out. This is where the 1.20.5 change hits hardest: the new format writes pattern names in full and colours by name, while the old NBT format uses two- or three-letter pattern codes and numbered colours. The two cannot be mixed, and trying gives you a blank banner without any error.
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Common mistakes
Shapes are drawn exactly; artwork is not. The creeper charge, skull and Mojang logo patterns are textures rather than geometry, so the preview labels them instead of drawing them — the command itself still gets them right. The six-layer ceiling is a loom rule, not a game rule: commands can stack more, but a banner past six layers can no longer be copied or repaired in-game.