About
donjon RPG is a long-running, freely available collection of procedural generators tailored for tabletop role-playing games. Game masters and players across dozens of systems — including Dungeons & Dragons (all editions), Pathfinder, Traveller, Call of Cthulhu, Alien RPG, Blade Runner RPG, and more — can instantly generate rich, randomized content without any account or installation required. Core tools include the Random Dungeon Generator (with features, monsters, and traps), the Fractal World Generator and Fantasy World Generator (for hex-based world maps), and the NPC Generator (complete with descriptions, game stats, and portraits). Additional generators cover random encounters, magic shops, treasure hoards, inns and taverns, towns, names, calendars, weather, and even full treasure maps with marker icons and clues. For fantasy campaigns, donjon offers a Fantasy Calendar Generator, Medieval Demographics Calculator, and a Random Adventure Generator based on classic design kits. Science fiction GMs can generate star systems, freight jobs, and alien names. Specialty tools like the Five Room Dungeon Generator (based on Johnn Four's design framework) and The Endless Oubliette (using Dyson's geomorphs) cater to specific adventure-design methodologies. The site is free to use, supported by optional Patreon and Buy Me a Coffee contributions. Its utilitarian interface prioritizes function over form, making it a reliable, no-fuss resource that game masters have depended on for years.
Key Features
- Random Dungeon Generator: Creates fully detailed dungeon maps complete with random features, monsters, and traps for multiple D&D editions and Pathfinder.
- Fantasy & Sci-Fi World Generators: Generates fractal world maps and hex-based fantasy or sci-fi worlds with terrain, cities, mountain ranges, and star systems.
- NPC & Name Generators: Produces NPCs with descriptions, game stats, and portraits, plus name generators for fantasy, sci-fi, and specialized settings like Avatar Legends or Blade Runner.
- Encounter, Treasure & Magic Shop Generators: Quickly generates random encounters, loot tables, and magic shop inventories for D&D 5e, 5.5e, AD&D, Pathfinder, and D&D 4e.
- Town, Inn & Calendar Generators: Creates random towns and city maps, inn menus and rumors, fantasy calendars with lunar cycles, and random weather conditions.
Use Cases
- Game masters quickly generating a random dungeon map with monsters and traps before or during a D&D or Pathfinder session
- Writers and world-builders creating fantasy maps, demographics, and calendars for novels or homebrew campaign settings
- GMs improvising NPC names, descriptions, and stats on the fly when players go off-script
- Dungeon designers using the Five Room Dungeon or Endless Oubliette tools to scaffold structured adventure encounters
- Sci-fi RPG referees generating star systems, freight jobs, and alien NPC names for Traveller or Alien RPG campaigns
Pros
- Completely free with no account required: All generators are accessible instantly in any browser without sign-up, subscription, or installation.
- Broad system support: Covers virtually every major tabletop RPG system including all D&D editions, Pathfinder, Traveller, Call of Cthulhu, Alien RPG, Blade Runner RPG, and more.
- Massive variety of generators: Dozens of distinct tools cover every aspect of session prep, from world-building and cartography to NPCs, shops, weather, and adventure hooks.
- Proven and reliable: A long-established resource trusted by the tabletop RPG community for years, with consistent availability and stable functionality.
Cons
- Dated, utilitarian interface: The site's design is minimal and functional but lacks modern UI polish, which may feel uninviting to new users.
- Limited customization depth: While generators offer some options, advanced users may find fewer configuration knobs than dedicated commercial tools provide.
- Algorithmic, not AI-powered: Generators rely on procedural/Markov-chain logic rather than large language models, so output can occasionally feel formulaic or repetitive.
Frequently Asked Questions
Is donjon RPG free to use?
Yes, all tools on donjon are completely free to use in any web browser with no account, subscription, or payment required. The creator accepts optional support via Patreon and Buy Me a Coffee.
Which tabletop RPG systems does donjon support?
donjon supports a wide range including D&D 5e, D&D 5.5e, AD&D, D&D 4e, Pathfinder, d20/Fantasy SRD, Microlite20, Traveller, Call of Cthulhu, Alien RPG, Blade Runner RPG, and Avatar Legends, among others.
What types of content can I generate with donjon?
You can generate dungeon maps, world maps, NPC profiles, random encounters, magic shop inventories, treasure hoards, town and city maps, inns and taverns, fantasy calendars, weather, adventure hooks, treasure maps, star systems, and much more.
Do I need to install anything to use donjon?
No installation is needed. All generators run directly in your web browser. The site also offers downloadable apps for some tools.
Is donjon open source?
The site includes a code library and download section, suggesting some components are available for download, though the project is not fully open source in the traditional sense. Check the site's Appendix for code library details.
