Developer
ToolsTokenizer
Encode text to token IDs and compare tokenization across different AI models
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Tokens
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Token IDs
How to use
Enter or paste text to see how different AI models tokenize it. Tokenization is the first step in how LLMs process text — understanding it helps with prompt engineering, cost estimation, and debugging model behavior.
- Real-time tokenization as you type — immediately see token IDs and counts
- Compare token counts across four different model families (GPT-4o, GPT-4, text-davinci-003, GPT-2)
- Color-coded token visualization showing how text is split into tokens
- Decode token IDs back to text to verify and understand the encoding