Developer Tools
Token Counter
Count tokens, words, and characters in any text. See how your text fits in Claude, GPT-4o, or Gemini context windows.
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Tokens (approx)
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Words
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Characters
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Context window usage
0 / 200,000 tokens (0.0%)
Token count is approximate — uses a heuristic similar to BPE. For exact counts, use the provider's official tokeniser library.
Token Counting for LLMs: What Counts, Why It Matters, and How to Check
What a token is, how BPE tokenization works, why token counts affect LLM costs and context limits, and how to count tokens in code and the browser.