LLM Token Counter

About

LLM Token Counter is a free browser-based tool that calculates precise tiktoken counts for OpenAI models like GPT-4o, GPT-4, GPT-3.5, o1, and o3. It also provides reliable estimates for Claude, Llama 3, Gemini, and Mistral. You can watch your prompt tokenize live with color-coded segments, view character, word, sentence, and line totals, check average characters per token for each model, and test with sample prompts. It operates entirely on your device, requires no registration or API key, and ensures no data leaves your browser. The tool functions offline after the initial load and will remain free permanently.