Skip to content
Yunedia Tools

LLM Token Counter

Count tokens with the real BPE tokenizer for OpenAI models (exact), plus clearly labeled estimates for Claude, Gemini and other models.

Enter some text to see the count.

How to use

  1. Paste the text you want to count.
  2. Pick a model. GPT-4o family and GPT-4/3.5 are counted exactly with the real tokenizer.
  3. Claude, Gemini, Llama and Mistral show an estimate, always labeled as one, with the heuristic stated.

Notes

Exact counts run entirely in your browser with gpt-tokenizer (o200k_base / cl100k_base); your text is never sent to a server. Other providers do not publish a browser tokenizer, so this page offers only a character-based estimate for them and never presents it as exact.

FAQ

How far off can the estimates be?
For English prose, often within 10–20%, but code, long numbers and CJK text can be far off. Keep a margin when budgeting from an estimate.
Why does Japanese cost more tokens?
BPE tokenizers are trained mostly on English, so a Japanese character typically becomes about one token (sometimes more). You can verify this with the exact GPT counters on this page.