Scenario Notes — Scenario Writing, NPCs & Lore for TTRPG GMs

A single tool for TTRPG Game Masters to write scenarios, manage NPCs, and keep world/lore notes — with one click to export a player-safe copy that automatically hides everything marked GM-only.

Single HTML, no install, no account, fully offline. Just double-click the file. English / 日本語 toggle.

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WHAT IT DOES
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[ Scenario writing ]
- Create and switch between multiple scenario documents (sidebar list)
- Rich text: headings (H1-H3), bold, italic, quotes
- Auto-generated table of contents from your headings (click to jump)
- Insert 3 kinds of decorated boxes: GM Only, Handout, Check

[ Auto-hide GM secrets on export ]
- One button ("Export player-safe") generates a standalone HTML file with every GM Only box stripped out
- Handout and Check boxes are kept as-is
- Ready to hand to players, post as a recap, or share as a replay log

[ NPC roster ]
- NPC cards: name, tags, stats, notes
- Upload a portrait image (auto-resized to keep things light)
- Search/filter by name or tag

[ World & lore ]
- Add entries tagged Location / Faction / Other
- Search by name or content

[ Saving your work ]
- Autosaves to your browser (localStorage)
- "Save" downloads your whole project as a single .json file; "Load" restores it
- Move between machines or keep backups easily

[ Look & feel ]
- Dark and light themes
- Language toggle in settings (gear icon)

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HOW TO USE
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- Open the file and start writing your scenario, add NPCs, then organize world/lore notes.
- Use "Save" regularly to back up your project as a file.
- When you need a version to show players, hit "Export player-safe".

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NOTES
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- Code-drawn, no image/audio assets — tiny and crisp at any resolution
- Tested on current Chrome / Edge. No internet needed
- Everything runs in your browser — nothing is uploaded anywhere
- Commercial use OK (see included terms)

FOR: TTRPG Game Masters who want to write scenarios while keeping GM secrets separate from what players see, and anyone managing NPCs/lore for a campaign.

Found a bug or want a feature? Message me.