Family Tree Builder
Map every character relationship in your story world
A free online family tree maker built for writers, OC creators, and worldbuilders. Visualize dynasties, bloodlines, and character relationships. Use our template library to get started quickly.
What You Can Do with Family Tree Builder
Start Instantly
Open the app and build your first tree as a guest. No download, installation, or signup required.
Relationship Mapping
Smart auto-layout arranges characters by generation, keeping royal houses, dynasties, and found families readable.
Character Profiles
Attach names, titles, bios, avatars, and notes to every person so your cast stays consistent while you write.
Export Anywhere
Save your tree as JSON, JPG, PNG, SVG, or PDF to drop into wikis, story bibles, or shared documents.
Copy for AI Tools
Copy any tree as Markdown, plain text, or JSON and paste it straight into your favorite AI assistant.
Built for Fiction
Designed around stories, not genealogy records — perfect for fantasy houses, faction hierarchies, and OC lore.
How It Works
Add your characters
Drop people onto the canvas and fill in names, titles, and bios as much or as little as you like.
Connect the relationships
Link parents, partners, and children — the smart layout organizes generations automatically.
Export and keep writing
Download an image or PDF, or copy the tree as Markdown to reference anywhere you write.
Built for Fiction writers, Fantasy authors, OC & fandom creators, TTRPG game masters and worldbuilders.
Free to Use, Right Now
Open Family Tree Builder in your browser and start creating immediately — no download or credit card required.
- Guest mode — one tree with up to 50 characters
- Free account — up to 2 trees with online saving, 7-day history, JSON/JPG export and note/AI-ready copy text formats
- Pro — unlimited trees and characters, automatic online backups, PNG/SVG/PDF export, and collaboration features
More from the StoryLegend Suite
Family Tree Builder works even better alongside the rest of the suite.