How to use: Add blocks with title (e.g., minecraft:stone) and pick color, then click Add to add to palette. Select a block from palette. Use tools to draw blocks on the grid. Pan by right-click drag. Zoom with mouse wheel. Use selection tool to select blocks. Copy, Cut, Paste work on selection. Draw line tool draws a line of blocks. Draw circle tool draws outline circle of blocks. Fill tool floods fill area with selected block or erases. Export button outputs Minecraft /setblock commands for all placed blocks. Share button generates a URL hash with map data you can share. Clear button resets everything. Layers are supported, toggle visible layers. By default one layer 'default' exists. Y coordinate is fixed (default 64) but can be changed in input.