AI Tokenizer
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AILLMTokenizationCost Estimation
Count tokens and estimate costs across OpenAI, Anthropic, and other LLM APIs. Paste text or upload a file.
A free in-browser token counter and cost estimator for LLM APIs. Drop in a prompt, pick a model, and see token count, context utilization, and an end-to-end cost estimate — no signup, nothing leaves your browser.
#Features
- Multi-provider model picker — OpenAI (GPT-4o, GPT-4 Turbo, GPT-3.5), Anthropic (Claude Opus / Sonnet / Haiku), and more, with searchable list
- Real-time token count — Updates as you type, with characters, words, lines, and sentences
- Context utilization — Visual progress bar against the model's context window
- Cost estimation — Input + estimated output cost, configurable output tokens
- Paste or upload — Paste from clipboard or upload a
.txt/.mdfile - Privacy-first — Tokenization runs entirely client-side
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