Is the Accurate Tokenizer & Visualizer free?

Yes, the Accurate Tokenizer & Visualizer is completely free to use. All processing happens in your browser — no sign-up or API key required.

Does the Accurate Tokenizer & Visualizer send my data to a server?

No. All tools run entirely in your browser. Nothing is sent to any server.

🖥️ Free Tool

Accurate Tokenizer & Visualizer

Paste any text and see exactly how OpenAI's GPT models and Anthropic's Claude models split it into tokens. Each token is highlighted with a unique color so you can understand where boundaries fall, compare tokenizers, and optimize your prompts for cost and context fit.

Input Text

0 characters0 words0 tokens (est.)

Model

Token Visualization

Tokens

Characters

Words

GPT-4o Context Usage0 / 128,000 (0.00%)

Type or paste text on the left to see token boundaries

Note: This is a browser-based approximation using 3.5 chars/token for GPT-4o. Real tokenizers (BPE/SentencePiece) may produce slightly different counts and boundaries.

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