LLM Token Counter & Cost Estimator

About LLM Token Counter

LLM Token Counter is a free online tool that counts tokens and estimates API costs for all major language models including GPT-4, GPT-4o, Claude Opus, Claude Sonnet, Gemini, Llama, Mistral, and DeepSeek. Paste your prompt and instantly see how many tokens it uses and what it will cost. The tool estimates token counts using standard tokenization heuristics and calculates costs based on current API pricing for both input and output tokens. It displays a comprehensive pricing table showing costs across all major models, helping you choose the most cost-effective option for your use case. Token counting is essential for anyone working with LLM APIs. Every API call is billed by token count, and understanding your token usage helps you optimize prompts, control costs, and stay within context window limits. A prompt that costs $0.001 on GPT-4o mini might cost $0.15 on Claude Opus — this tool helps you make informed decisions. Everything runs entirely in your browser. Your prompts and text are never sent to any server, making it safe for counting tokens in proprietary prompts, system messages, and sensitive content. There are no usage limits and no account required. Common use cases include estimating API costs before making calls, optimizing prompt length to reduce costs, comparing pricing across different models, checking if prompts fit within context windows, budgeting for AI-powered features, and analyzing token efficiency of different prompt strategies. For related tools, check out the Prompt Builder for creating structured system prompts, or the Word Counter for general text analysis.