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
Useful for quick file work, text cleanup, calculations, content creation, and website or AI checks.
How to use it
Open the tool, enter or upload what it asks for, then copy or download the result directly.
Privacy and limits
Most tools run in your browser with no sign-in. Very large files or older devices may hit browser memory limits.
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.