Tokenizer
Encode text to token IDs and compare tokenization across different AI models
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