GDD-Forge

Overview

GDD-Forge is a free, open-source, offline-first editor for writing and maintaining Game Design Documents. Multiple projects, 12 segment types (hero, character, enemy, boss, core loop, dialogue, canvas, tension curve…), checklist with task groups, design decisions, dependency-mapped features, visual brainstorm canvas, image upload and export to HTML/Markdown/PDF. Everything saves to portable .GDD files (ZIP with manifest.json + assets). No login, no server, no tracking. Built with Next.js 15, TypeScript and Tailwind.

Highlights

• 12 segment types: hero, text, image, grid, callout, character, enemy, boss, loop, dialogue, note, tension
• Custom .GDD file format v2 (ZIP + manifest.json + deduped assets by SHA-256)
• 100% client-side, offline-first, no backend, no login, no tracking
• Multi-GDD support with IndexedDB persistence + on-demand asset loading
• Export to HTML, Markdown and PDF
• Light/dark theme with design tokens

Gallery