ConvertTOON: Optimize Your Data Format

Convert JSON to TOON format and reduce data size by up to 50%. Optimize token usage for LLM APIs, improve API performance, and save bandwidth costs.

50%
Size Reduction
3x
Faster Parsing
∞
Free & Offline
🔒
100% Private

✨ New: Getting Started Guide and FAQ available now!

📊 Multiple Formats

Convert between JSON, TOON, CSV, YAML, XML, Base64, JWT, and more. Flexible format support for all your needs.

⚡ Real-time Analysis

See token counts, compression metrics, and data statistics instantly as you convert. Understand the impact of format changes in real-time.

🛡️ Privacy First

All processing happens in your browser. Your data never leaves your device. No servers, no storage, completely private.

JSON

Tokens: 0
TOON
Tokens: 0
        
📚 Schema Library
Filter by category:
User Profile
Standard user profile with contact information
user#user#profile#contact
Blog Post
Article or blog post structure
content#blog#article#content
API Response
Standard API response wrapper format
api#api#response#wrapper
Product
E-commerce product with pricing and inventory
business#product#ecommerce#inventory
Configuration Object
Application configuration settings
config#config#settings#application
💡 Tip
Click "Use Template" to load a schema's example data into the converter. You can then validate your own data against these predefined schemas.
About ConvertTOON - JSON to TOON Format Converter
ConvertTOON is the premier free online tool for converting between JSON and TOON formats. TOON (Tokenized Object Notation) is a revolutionary compact data format designed to minimize file size while maintaining data integrity and readability. Unlike traditional JSON, TOON uses intelligent type markers and string encoding to dramatically reduce storage requirements and network bandwidth. This makes it ideal for applications where data compression and token efficiency are critical.
At converttoon.com, we provide a fast, free, and secure JSON to TOON converter that processes all your data locally in your browser. Whether you're optimizing API payloads, reducing token consumption in LLM APIs, or simply exploring the TOON format, ConvertTOON is your go-to solution.
Key Features of ConvertTOON
  • JSON to TOON Conversion: Automatically convert your JSON data to TOON format with a single click, achieving compression rates typically between 30-50%
  • TOON to JSON Conversion: Seamlessly reverse the process and restore your original JSON structure from TOON format with perfect fidelity
  • TOON Format Validation: Validate TOON syntax instantly to ensure data integrity before using in production environments
  • Real-time Token Counting: See exactly how many tokens your data will consume, helping optimize API usage and reduce costs with services like OpenAI, Anthropic, and others
  • Compression Analytics: Visual comparison of token counts showing exactly how much space and cost you save with TOON format conversion
  • No Installation Required: ConvertTOON works directly in your web browser - no downloads, plugins, or setup needed
  • 100% Private & Secure: All conversions happen locally in your browser. Your data is never sent to any server
Popular Use Cases for ConvertTOON
  • API Optimization: Reduce API payload sizes and improve response times by using TOON format for data transmission between services
  • Database Storage: Store more data in less space by converting JSON documents to TOON before database insertion
  • LLM Token Optimization: Minimize token consumption in language model APIs (ChatGPT, Claude, GPT-4) by pre-converting prompts and data to TOON format, significantly reducing costs
  • Mobile Applications: Reduce bandwidth consumption and improve performance on mobile networks with compact TOON encoding
  • Real-time Analytics: Process streaming data more efficiently by using TOON format to reduce memory footprint and processing overhead
  • IoT & Edge Computing: Transmit sensor data efficiently with minimal bandwidth requirements using TOON compression
  • Data Archiving: Compress historical data for long-term storage while maintaining structure and searchability
💡 Pro Tip - Save on LLM API Costs:
If you use OpenAI, Claude, or other LLM APIs, converting your prompts and data to TOON format before sending can reduce token usage by 30-50%. Use ConvertTOON to estimate your potential savings before implementation.
Ready to Optimize Your Data Format with ConvertTOON?
Start converting your JSON to TOON today using ConvertTOON.com. Select your conversion mode, paste your data, and instantly see the token and compression improvements. No installation required - works directly in your browser.
All conversions happen locally in your browser using converttoon.com. Your data is never sent to any server - complete privacy and security guaranteed.
What is TOON Format?
TOON (Tokenized Object Notation) represents a fundamental rethinking of JSON optimization. Instead of the verbose structure of JSON with repeated quotes and separators, TOON uses efficient type markers:
  • n - null value
  • b1/b0 - boolean (true/false)
  • # - numbers (e.g., #42, #3.14)
  • s<length>:<string> - strings with length prefix
  • [...] - arrays with comma-separated values
  • {...} - objects with key-value pairs using = and ; separators
This approach can reduce data size by 30-50% compared to JSON, making it perfect for token-sensitive applications and bandwidth-constrained environments.
⚠️When NOT to Use TOON Conversion
While TOON format offers significant benefits, there are specific scenarios where JSON or other formats are more appropriate:
❌ Public APIs:Stick with JSON for public APIs. It's universally understood, has widespread library support, and is the industry standard. TOON requires custom parsing.
❌ Human-Readable Data:If your data needs to be easily readable by developers or end-users, JSON's readable format is superior. TOON's brevity comes at the cost of readability.
❌ Long-term Archival:For data that needs to remain interpretable decades from now, JSON is safer. Custom formats like TOON may become obsolete or require maintenance.
❌ Small Data Sets:For small JSON payloads (<1KB), compression overhead and parsing complexity outweigh benefits. JSON is more practical.
❌ Standardized Formats:When working with standards (e.g., OpenAPI, JSON Schema, HAL), always use the specified format. Don't convert standardized data.
❌ Regulatory Compliance:Some industries require standard formats for audit trails and compliance. Check regulations before using proprietary formats like TOON.
❌ Heterogeneous Systems:If data flows between many different systems/languages that don't have TOON parsers, JSON's universal support is critical.
❌ Browser Compatibility:For client-side web apps, JSON's native parsing (JSON.parse) is faster and more reliable than custom TOON parsers.
✓ Best Practice: Use TOON for internal APIs, LLM prompts, and bandwidth-constrained scenarios. Use JSON for everything else.
🛠️ Developer Tools Suite
Beyond TOON conversion, we provide 28+ powerful tools to help developers with everyday tasks. Convert, validate, encode, and transform your data instantly.
📄 JSON Tools
Format, minify & validate JSON instantly
🔐 Encoding
Base64, URL encoding & decoding
🔄 Converters
JSON↔CSV, XML→JSON, HTML→Markdown
✓ Validators
Email, URL, IP, phone validation
🔗 Hash & Crypto
SHA256, MD5, JWT decoder
⏰ Date/Time
Unix timestamp conversion
⚙️ Environment
.env ↔ JSON conversion
🎨 Utilities
Case converter & Regex tester
Select a tool from the dropdown menu above or click any category above to get started!