TOONBetaTOONToken-Oriented Object Notation
The premier Online JSON to Toon converter. A compact, human-readable encoding of the JSON data model for LLM prompts.
Save Up to 40% on LLM Token Costs
Reduce Costs
Save 20-40% on API costs by reducing token count for GPT-4, Claude, and Gemini.
Faster Processing
Fewer tokens mean faster response times and lower latency for your LLM applications.
100% Private
All conversions happen in your browser. Your data never leaves your device.
Bidirectional
Convert JSON to TOON and back. Seamlessly integrate with existing workflows.
Real-time Metrics
See token counts and savings for GPT-4o, Gemini, and Claude in real-time.
Human Readable
TOON maintains readability while being optimized for machine processing.
JSON vs TOON: Side-by-Side Comparison
* Based on average data from 1,000+ conversions. Actual savings may vary depending on your data structure.
How it Works
Token Object Oriented Notion (TOON) is a data format designed to be token-efficient for Large Language Models (LLMs) while remaining human-readable.
Our converter analyzes your JSON structure and optimizes it by:
- Identifying arrays of objects and converting them to a header-based table format.
- Removing redundant keys in repeated objects.
- Using a concise syntax for key-value pairs.
Simply paste your JSON or upload a file, and click "Convert". You can also convert TOON back to JSON for seamless integration with your existing workflows.
Frequently Asked Questions
TOON stands for Token Object Oriented Notion. It's a data format that reduces the token count of structured data by 20-40%, making it cheaper and faster to process with AI models like GPT-4, Claude, and Gemini.
Yes! All conversions happen entirely in your browser using client-side JavaScript. Your data is never sent to any server, ensuring complete privacy and security.
Absolutely! The converter supports bidirectional conversion between JSON and TOON formats. Simply toggle the conversion mode using the switch button.
Token savings vary based on your data structure, but typically range from 20-40%. The converter shows real-time token estimates for GPT-4o, Gemini, and Claude, along with percentage savings.
TOON is a text-based format that works with any LLM that accepts text input, including GPT-4, Claude, Gemini, and other popular models. The format is optimized for token efficiency across all major providers.
Yes! This converter is free to use for both personal and commercial projects. There are no usage limits or restrictions.