LLM Token Counter

Count exact token usage for any text using the actual tokenizers of GPT-4o, Claude 3.5 Sonnet, and Gemini 2.0 Flash. Compare token counts across models and calculate real API costs instantly. Essential for prompt budget planning and cost optimization in production AI applications.

Run LLM Token Counter Interactively 100% client-side execution in your browser. Zero data retention.

Open Interactive Tool

What Problem LLM Token Counter Solves

Production AI deployments require predictable token economics, rigorous parameter verification, and deterministic schema handling. LLM Token Counter isolates parameters client-side before payloads hit third-party foundation model APIs.

Primary Production Use Cases

Calculate cost before running large batch
Optimize prompt to fit within token budget

Security & Data Privacy Considerations

All computations execute locally in browser memory. No prompt payloads, test inputs, or secret credentials are ever retained or stored on central servers.

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