About This File
Hi everyone,
I've been working on a small browser tool for CK3 story mods for a while and I feel it's finally in a good enough state to share it with you guys.
Hopefully it will empower some of you to make cool mods 
So what is it and what can it do?
- CK3 Storyline Editor is a visual editor that runs fully offline in your browser.
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Event chains on a graph
- nodes are events, edges are “this choice leads here.”
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Forms instead of script
- titles, descriptions, options, triggers, and effects are filled in through the UI. The tool generates localization, trigger_event links, and the rest of the CK3 script for you.
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More than just events
- you can create story starts, repeatable events, decisions, character interactions, custom traits (including tracked traits with XP), triggers, flags, dynamic story characters, and add custom images (backgrounds, trait icons, etc.) converted to DDS on export.
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Sanity checks before you export
- live preview and “Walk chain” mode, let's you play a mock of the mod without having to run it in game (they approximate triggers; they're not the real game engine).
- Save your work: project JSON for backups, autosave in the browser.
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And Finally a one click button to export a fully working mod ZIP.
- you can also import a mod ZIP (works fine with mods exported by this tool, don't expect it to work correctly with any mod tho)
How to run it?
- download the ZIP from here
- double click index.html
There's a bundled demo (Dragon Slayer Saga) that you can just load the JSON and export as a mod, and a few starter templates if you want to click around before building your own mod from scratch. The templates are in order of complexity to showcase a bit of everything this tool can do.
Export has been tested on quite a few story setups and generally works well for tool-authored mods. That said, If something breaks in-game, please send me your error.log (from Documents\Paradox Interactive\Crusader Kings III\logs\) along with a short description of what you were trying to do. That helps a lot to fix all the issues.
Mods you make are yours; no permission needed to publish them. A casual “made with CK3 Storyline Editor” credit is appreciated but not required.
Feedback welcome.
Full disclosure: this tool was built with substantial help from AI (coding assistant + iteration).