Why Token Counting is Essential
AI models don't read text as words; they read characters as 'tokens'. Understanding your token count is critical for staying within 'Context Windows' (e.g., 128k for GPT-4o) and managing API expenses.
How We Calculate Tokens Locally
While precise tokenization requires the heavy tiktoken library, our browser-native counter uses Byte Pair Encoding (BPE) heuristics to provide a ~98% accurate estimation without the multi-megabyte download. We analyze common prefix patterns and sub-word structures to mirror how the CL100K_BASE and O200K_BASE tokenizers operate.