LLM Token Counter

What it does

LLM Token Counter is a free, in-browser tokenizer that gives you exact tiktoken counts for OpenAI (GPT-4o, GPT-4, GPT-3.5, o1, o3) and accurate estimates for Claude, Llama 3, Gemini, and Mistral. See your prompt tokenized live with color-coded chunks, character/word/sentence/line counts, average chars-per-token per model, and sample prompts for quick testing. 100% client-side, no signup, no API key, no data leaves your browser. Works offline after first load. Free forever.

Free LLM token counter for GPT-4o, GPT-4, Claude, Llama 3, Gemini & Mistral. Exact tiktoken counts, live token visualization, 100% in-browser. No signup.

Use this online LLM token counter to see exactly how many tokens your prompt becomes for any major language model. Counts are exact for OpenAI models ( cl100k_base for GPT-4 / GPT-3.5 and o200k_base for GPT-4o, GPT-4.1, o1, o3 via tiktoken ) and estimated for Claude, Llama 3, Gemini, and Mistral. Everything runs in your browser, nothing is uploaded. Each colored chunk is one token. Hover any chunk to see its position in the sequence. A token is the unit of text a language model actually sees. Modern LLMs do not read characters or words. they read sequences of tokens drawn from a fixed vocabulary, typically built with byte-pair encoding (BPE) or SentencePiece. A token can be a whole word…from singhajit.com

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