Dungeon Mapper is a free map builder for tabletop RPGs that runs in your browser, no account needed and nothing to install. Draw or generate a map, hide what your players shouldn't see, and bring it to your table.
- A first draft in minutes. Start from a sample, one of four map generators, or a blank grid, then keep polishing with furniture, tokens, notes, themes, and art layers.
- Prep and play stay separate. Set up fog and private notes ahead of time, then run the session on its own save without touching the map you built.
- A second screen for players. Open the player display, reveal rooms as the party explores, and blank it with one click.
- One map, many looks. The same layout can be a dungeon, castle, starship, cyberpunk street, pirate ship, or desert ruin, plus a black and white version for printing.
- Free, and yours. There's no paid tier and no account. Maps are saved in your browser, it works offline, and you can export a backup file whenever you want another copy.
- Build the map. Start from a sample, a generator, or a blank grid, then paint rooms, place furniture and tokens, and add notes only you can see.
- Decide what players see. Turn on fog and pick the starting area: hidden tokens and private notes stay on your side.
- Show it at the table. Open the player display on a second screen, and reveal rooms as the party explores.
Export a private backup, an image for players, or print pages whenever you need them. The feature reference covers every tool.
| Area | What's included |
|---|---|
| Map editing | Grids from 8×8 to 128×128, 20 tile types, custom themes and tiles, undo and redo, copy and paste, background image tracing, and multi-level maps linked by stairs. |
| Generators | Rooms and corridors, open terrain, caverns, and villages, with repeatable seeds, density controls, rivers, and room labels. |
| At the table | Prepare and Run modes, a read-only player display, fog, tokens, initiative, measuring shapes, line of sight, area markers, and session checkpoints. |
| Art and themes | 13 themes plus Dungeon Folio, black and white print versions, paper textures, hand-drawn rendering, lighting, stamps, and scene templates. |
| Saving and export | Automatic saving in the browser, JSON backups, PNG and SVG export, high-resolution print pages, and offline use as an installed app. |
- Maps live in this browser on this device. Export a backup (Export > Back up project) before clearing browser data or switching computers.
- Backups don't include session records. In Run, Download session recovery keeps a private copy of a session in progress.
- PNG, SVG, and print pages are for sharing and printing; only JSON backups can be imported again.
- To use it offline, open Offline & updates while online and wait for App and built-in art cached.
- Print at actual size (100%) on A4 or Letter.
You need Node.js 20 or newer.
git clone https://github.com/evillollive/Dungeon-Mapper.git
cd Dungeon-Mapper
npm install
npm run dev # open the local address Vite prints, usually http://localhost:5173Other commands:
npm run build # type-check and build for production
npm run preview # preview the production build
npm run lint # run ESLint
npm test # run the unit tests oncePull requests run the unit tests plus browser tests in Chromium, Firefox, and WebKit, and the app deploys only after those pass. The development guide covers project structure and tests.
| Need | Start here |
|---|---|
| Every tool, explained | Feature reference |
| How the code fits together | Architecture |
| Setup, scripts, and tests | Development guide |
| Where it's headed | Roadmap and user experience roadmap |
| What changed | Changelog |
Found a bug or have an idea for a tool? Open an issue, or read CONTRIBUTING.md before sending a pull request.
AGPL-3.0 © Alex Perrault