⬇ Download here — portable exe, no install needed (all releases)
A desktop editor for Europa Universalis IV mods. Point it at your EU4 install, pick a mod folder if you have one, and you get the game's world map — political, religion, culture, trade goods, trade nodes, development, areas and regions, climate — with the data behind it editable: provinces, countries, rulers, diplomacy and wars, estates, rebels, technology and units, missions, events, decisions, government reforms, trade companies, the HRE, localisation, defines.
Click a province to edit it, or paint religion and culture straight onto the map. Changes collect in a pending queue you can review, undo, and redo before anything is written to disk.
Total conversions work. Reads layer your mod over the base game the way EU4 does, replace_path included, so Anbennar and the like open without special handling — and keys the toolkit doesn't model are left alone rather than dropped.
Any date works, not just 1444 — the map and editors re-derive the world at whatever date you pick.
Also in there: project-wide search, a mod-vs-vanilla diff browser, a validation dashboard, and export & launch.
To run the released exe:
- Windows 10 or 11 (64-bit)
- A Europa Universalis IV installation
- 8 GB RAM recommended — the world map is decoded and rendered in memory
To build from source, additionally:
Double-click run.bat (or run it from a terminal). On first run it installs npm dependencies, then builds and starts the app — the initial Rust compile takes a few minutes; later runs are fast. It runs in "stable mode": the running instance is never rebuilt or hot-reloaded out from under you — re-run run.bat to pick up source changes.
For development with hot reload instead, use npm run tauri dev.
build.bat produces a portable, optimized executable at dist\eu-toolkit.exe. No installer needed — settings live in %APPDATA%\com.eutoolkit.app.
Built with Tauri 2 (Rust) and SvelteKit (Svelte 5, TypeScript).
Generative AI tools were used in the creation of this project, including for writing code, tests, and documentation. All of it was directed, reviewed, and tested by a human before release. If you find a bug or something that looks wrong, please open an issue or a pull request.