Back to Home

About ToonConvert

A free, open-source tool for converting data formats to TOON for optimal LLM token efficiency

Our Mission

ToonConvert was created to solve a critical challenge in working with Large Language Models (LLMs): the high cost of tokens. Every character sent to an LLM API costs money, and traditional data formats like JSON are incredibly verbose and inefficient.

By providing free, easy-to-use tools for converting data to TOON (Token-Oriented Object Notation) format, we help developers and organizations reduce their LLM API costs by 30-60% while maintaining full data integrity and readability.

What is TOON?

TOON (Token-Oriented Object Notation) is a compact, human-readable data serialization format specifically designed for efficient token usage with Large Language Models. Unlike JSON, which repeats keys for every object in an array, TOON declares keys once and streams data in rows, similar to how databases store tabular data.

Key Benefits:

  • Token Efficient: 30-60% fewer tokens than JSON
  • Human Readable: Clean, intuitive format that's easy to understand
  • LLM Optimized: Designed specifically for AI comprehension
  • Fully Reversible: Convert back to JSON, XML, CSV, or YAML without data loss

Why Choose ToonConvert?

30-60% Token Savings
TOON format is specifically designed to reduce token usage in LLM applications while maintaining data integrity.
100% Privacy
All conversions happen in your browser. Your data never leaves your device, ensuring complete privacy.
Open Source
Built with modern web technologies and available for the community to review, contribute, and learn from.
Developer Friendly
Easy-to-use interface with real-time conversion, copy-to-clipboard features.

Supported Formats

ToonConvert supports bidirectional conversion between TOON and multiple popular data formats:

JSON ↔ TOON

The most common data format for APIs and web applications

XML ↔ TOON

Legacy data format with full structure preservation

CSV ↔ TOON

Tabular data format perfect for spreadsheets and databases

YAML ↔ TOON

Configuration format popular in DevOps and cloud services

Technology Stack

ToonConvert is built with modern, cutting-edge web technologies to ensure the best performance and user experience:

  • Next.js 16: React framework for production-grade applications
  • TypeScript: Type-safe JavaScript for reliable code
  • Tailwind CSS v4: Utility-first CSS framework
  • shadcn/ui: Beautiful, accessible UI components
  • Radix UI: Unstyled, accessible component primitives
  • Jest: Comprehensive testing with 77 passing tests

Privacy & Security

We take your privacy seriously. All data conversions happen entirely in your browser using client-side JavaScript. This means:

  • Your data never leaves your device
  • We never see, store, or have access to your conversions
  • No tracking, analytics, or cookies
  • Works offline once loaded
  • Auto-save uses only your browser's localStorage

For more details, please read our Privacy Policy.

Open Source

ToonConvert is committed to transparency and community collaboration. Our code is open source and available on GitHub for anyone to review, contribute to, or learn from.

View on GitHubReport an Issue

Created By

ToonConvert is created and maintained by Ahanaf Tahmid, a developer passionate about making AI tools more accessible and cost-effective.

GitHub Profile

Support ToonConvert

ToonConvert is free and open source. If you find it useful, consider starring the project on GitHub, sharing it with others, or contributing to the codebase.

⭐ Star on GitHubRead the Blog

Get in Touch

Have questions, suggestions, or found a bug? We'd love to hear from you!