Roll a brand-new dungeon for tonight's game, drawn entirely in text characters on a monospace grid. Every map comes from a seed, so if you read the seed out at the table (or send the link), everyone else gets exactly the same rooms, corridors and doors.
Type any word or phrase as a seed and press Build, or roll a random one. Same seed + same size + same rooms setting = same map.
Map
How to use it at the table
Roll until you like the shape, then read the seed out loud or press Copy share link and drop it in the group chat.
Copy as text puts the whole map, legend and room key on your clipboard as plain characters, ready to paste into a forum post, a notes app or a monospace chat block.
The room key gives each room a name, a sensory detail and what is inside, written for any rules system. Secret doors are marked with S: keep the GM copy to yourself and draw the players a version without them.
Use Print for a paper handout; controls and colours are removed for a clean black-on-white sheet.