Dreamopolis — Procedural Fantasy City Generator

Build the city of your dreams: a procedural generator that draws medieval towns from rules taken from real historical studies — streets-first radial growth, walls, fields, castles and rivers — then lets you hand-edit every road and plot and export the map.

Free browser toolRules-based, no AI mapsHand-editablePNG/JPG/PDF/JSON export
Map generator Pick a size preset, configure zones and terrain, generate — then edit and export your map. Guest demo available inside.
Dreamopolis — fantasy city generator

From blank canvas to finished map

  1. 1
    Choose a size preset

    Hamlet through Metropolis — or trace a custom boundary for the generator to conform to.

  2. 2
    Configure zones and terrain

    Toggle walls, rivers, lakes, coastlines and citadels; tune density with sliders or typed values.

  3. 3
    Generate

    The engine applies its research-based rules in your browser tab — country routes become wall gates, main streets lead to the market. No AI, no server queue.

  4. 4
    Edit and export

    Drag vertices, repaint terrain, rename landmarks, add a legend with points of interest — then export PNG, JPG, PDF or a JSON layout. Battle maps export with a 5 ft grid for Foundry VTT.

What the generator builds

Historical growth order

Land and water first, then roads, walls and buildings — the same order real towns grew in.

Streets-first radial layout

Country routes become gates; main streets run from them toward the central market square.

Realistic terrain

Meandering rivers, lake basins, beach slipways and cohesive terrain tracts — not random noise.

A living legend

Mark any building, road or lake as a point of interest — numbered badges and a legend generate automatically.

FAQ

Is Dreamopolis free?

Yes — it runs free in the browser in beta. A guest demo lets you explore without an account; signing in saves cities to the cloud.

Does Dreamopolis use AI to generate maps?

No — every map is built by hand-coded rules drawn from studies of real medieval towns.

Can I use maps for D&D or VTT?

Yes — battle maps export with a 5 ft grid as PNG, JPG or PDF, including walls and doors for Foundry VTT and universal VTT.

Is Dreamopolis also a Geometry Dash level?

There’s a separate high-difficulty Geometry Dash level that shares the name — this page is about the city generator.