AI Token Counter
Estimate cost without calling the API — prompt stays in your browser
Uses heuristic estimation (~4 chars/token English, ~1.5 chars/token Chinese). For exact counts, use the official tokenizer.
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
AI Token Counter is useful when preparing prompts, estimating tokens, checking AI crawler access, or making a site easier for AI assistants to understand. It keeps the small setup details in one place.
How to use it
For AI Token Counter, paste the text, URL, or configuration the tool asks for, then run the check or generator. Start with errors and warnings before polishing optional suggestions.
How to read the result
After using AI Token Counter, most results include a copy-ready output, a short summary, and practical next steps. Before publishing, check that names, URLs, and wording match your real project.
Privacy and limits
When using AI Token Counter, the input is handled mainly in your browser and does not require an account. Mask private business data, API keys, or client details before pasting them into any web tool.
For AI Token Counter: AI and search platform rules change. Treat the output as a working checklist, then confirm critical settings against the platform documentation.
Frequently Asked Questions
What is a token?
A token is the basic unit AI models use to process text. ~4 chars = 1 token in English; ~1-2 chars = 1 token in Chinese. AI APIs bill by tokens.
Why count tokens?
Two reasons: 1) AI APIs charge per token (a few dollars per million), so estimating cost prevents overages; 2) Models have context limits (GPT-5: 128K, Claude: 200K), so verify your prompt fits.
How accurate is this?
Uses industry-standard estimation (~4 chars/token English, ~1.5 chars/token Chinese) with ~±10% error. Exact counts require each model's specific tokenizer.
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.