Token Counter

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Count characters, words, lines and sentences, and estimate LLM tokens for popular model families — entirely in your browser. The paid API endpoint for agents is at POST /api/token-counter.

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characters
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chars (no spaces)
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words
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lines
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sentences
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bytes (UTF-8)
Estimated tokens by model

How to use

  1. Paste or type your text into the editor.
  2. Read the character, word, line and sentence counts.
  3. Compare estimated LLM tokens across model families.
  4. Copy the numbers into your prompt-budget spreadsheet.

Where it applies

  • Staying inside a model context window before sending a prompt.
  • Estimating API cost for a batch of documents.
  • Checking article length for SEO or editorial limits.
  • Agents budgeting prompts via the paid <code>POST /api/token-counter</code> endpoint.