Font Generator

Font Generator is a prompt-driven type design studio. Describe the feeling of a typeface, edit the result in the browser, and export a real font file.

The app does not generate raw glyphs from scratch. It starts from bundled open-licensed variable fonts, chooses a matching base, adjusts real OpenType axes, and optionally applies editable geometric shaping. This keeps exported fonts usable while still making each prompt feel distinct.

Features

• Prompt-to-font parameter generation through a server-side model route
• No-key local fallback, so contributors can run the project immediately
• Bundled open-licensed variable font catalog
• Live axis controls for weight, optical size, width, slant, and font-specific axes
• Character map and per-glyph node editing
• Browser-side .ttf export with HarfBuzz instancing
• .otf export when glyph geometry has been edited or shaped

Quick Start

npm install
cp .env.example .env.local
npm run dev

Open http://localhost:3939.

You do not need an API key for local development. With the placeholder key in .env.example, /api/generate uses the deterministic fallback.

Optional API Key

Add a key only if you want to test model-backed generation:

NVIDIA_API_KEY=nvapi-...
NVIDIA_BASE_URL=https://integrate.api.nvidia.com/v1
NVIDIA_MODEL=nvidia/nemotron-3-ultra-550b-a55b

Provider keys must stay server-side. Do not expose them through NEXT_PUBLIC_*, client components, screenshots, issues, or commits.

Optional route limits:

GENERATE_RATE_LIMIT=30
GENERATE_RATE_WINDOW_MS=60000
NVIDIA_TIMEOUT_MS=60000

Project Docs

• ARCHITECTURE.md - what the project does, how it works, and how the code is organized
• CONTRIBUTING.md - local setup, pull request expectations, and font contribution rules
• SECURITY.md - API key handling and vulnerability reporting
• THIRD_PARTY_NOTICES.md - bundled font and WebAssembly notices

Scripts

npm run dev
npm run typecheck
npm run build
npm run check

npm run check is the command CI runs.

License

Application code is licensed under MIT. Bundled fonts and WebAssembly assets keep their original upstream licenses. Exported font instances inherit the license of the selected base font.