Token Counter & Estimator
Count tokens and estimate API cost for GPT, Claude, and Gemini models online, instantly. Free token counter using OpenAI's real tiktoken tokenizer.
Related tools
Prompt Template Filler
Fill in {{variables}} in any AI prompt template instantly online, for free. Open the resolved prompt directly in ChatGPT with one click.
AI Code Explainer
Paste any code snippet and get a plain-English explanation instantly, powered by AI. Free tool for understanding unfamiliar code in any language.
AI Text-to-SQL Generator
Describe the query you need in plain English and get a ready-to-use SQL statement, powered by AI. Free tool with dialect support.
AI Error Message Explainer
Paste any error message or stack trace and get a plain-English diagnosis with a suggested fix, powered by AI. Free, no sign-up.
About Token Counter & Estimator
Count tokens and estimate API cost before you send a single request — entirely in your browser. • Exact counts for GPT-4o, GPT-4.1, and GPT-3.5 via OpenAI's real tiktoken tokenizer (bundled locally — no remote download) • Character-based estimates for Claude and Gemini, since those providers don't publish a public tokenizer • Shows how much of the model's context window your text uses, plus estimated cost for this prompt • Nothing you paste is ever sent to a server