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LLM Token Counter
Count tokens for ChatGPT, Claude, Gemini, Llama — accurate, free, runs entirely in your browser.
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Tokens
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Characters
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Words
$0
Input cost
⚡ Runs 100% in your browser — nothing is sent to a server
Accuracy notes
- OpenAI (GPT-5, GPT-4o, mini): 100% accurate — uses the official tokenizer.
- Llama, DeepSeek: uses the cl100k_base tokenizer, ~98% accurate.
- Claude, Gemini: estimated (Anthropic and Google do not publish their tokenizers). ±10% margin, good enough for cost estimates.
- Vietnamese typically uses 1.5-2× more tokens than English for the same content.
Why count tokens?
Every LLM API charges by tokens, not words. Knowing the count before you send a large prompt lets you:
- Estimate cost before running thousands of requests
- Make sure your prompt fits the model's context window
- Compare which model is more "token-efficient" for your text
How to use
- Pick the model you plan to use
- Paste text into the input box
- Token count + cost estimate update live
- Hit "Copy share link" to send to your team
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