Reduce LLM Token Costsby up to 60%
TOON is a compact, human-readable data format designed for LLM prompts. Convert JSON, YAML, or CSV to TOON and save on tokens while improving accuracy.
Why Choose TOON?
Typically 30-60% fewer tokens on large uniform arrays vs formatted JSON. Save money on every API call.
Explicit lengths and fields enable validation. Achieves 73.9% accuracy vs JSON's 69.7% across major LLMs.
Removes redundant punctuation. Uses indentation-based structure and tabular arrays for maximum clarity.
Instant conversion with our free online tools. No sign-up required, 100% client-side processing available.
Tested across Claude, GPT-4, Gemini, and Grok with 209 data retrieval questions. Consistently outperforms other formats.
100% lossless serialization. Convert back and forth between JSON and TOON without losing any data.
See the Difference
Same data, massive token savings
{
"users": [
{
"id": 1,
"name": "Alice",
"role": "admin"
},
{
"id": 2,
"name": "Bob",
"role": "user"
}
]
}users[2]{id,name,role}:
1,Alice,admin
2,Bob,userFree Conversion Tools
Convert between formats instantly with our free online tools
Ready to Reduce Your LLM Costs?
Start converting your data to TOON format today. Free, fast, and no sign-up required.