AI Token Counter
Estimate cost without calling the API — prompt stays in your browser
Estimates about 1.5 tokens per Chinese character and 1 token per 4 characters of other text. Use official model usage for exact counts.
Quick guide
What can AI Token Counter help you do?
Free online AI token counter and API cost calculator. Supports OpenAI GPT-5, Anthropic Claude, Google Gemini. Counts tokens instantly in your browser — no API key needed, prompt never uploaded. Alternative to tiktoken online.
Best for
Compare rough GPT, Claude, and Gemini input size, output allowance, and API cost before sending a long prompt, article, or chat transcript.
How to use it
Pick GPT, Claude, or Gemini in Select Model, paste a prompt, then set Expected output tokens. Input Cost, Output Cost, and Total Cost update.
How to read the result
Token Count: 1.5 tokens per Chinese character, 1 per 4 characters. Usage adds Expected output tokens to Context Limit.
Privacy and limits
Prompts stay in your browser and are not uploaded. Replace confidential code, business data, and secrets with test text.
Tokenizers and pricing differ. Use official API usage and billing for exact token counts and costs.
Frequently Asked Questions
What is a token?
A token is a unit used to process model input and output. This page estimates one token per 4 other characters or 1.5 Chinese characters; provider APIs use their own tokenizers.
Why count tokens?
A rough count helps check cost range and context usage before a request. Model limits and billing rules change, so treat the dropdown as a saved snapshot and check provider documentation.
How accurate is this?
This is a character heuristic, not the official GPT, Claude, or Gemini tokenizer. Use API usage for exact tokens, cache charges, and tool-call costs.
Is my input sent anywhere?
No. All counting happens in your browser. Your prompt never reaches our servers, OpenAI, Anthropic, or Google.
Do different models tokenize differently?
Yes. GPT-4o, Claude, Gemini each have their own tokenizer. The same text may yield 5-15% different token counts.