Is the Token Visualizer free?

Yes. It is free and open source with no login.

Which models are supported?

Common GPT and Claude tokenization schemes, computed client-side.

Is my text sent to a server?

No. Tokenization runs locally in your browser; your text never leaves your device.

Why do token counts matter?

Tokens drive both cost and context limits; fewer tokens mean cheaper calls and more room for content.

It is a close estimate using standard tokenizers; a provider's exact count can vary slightly by model version.

Token Visualizer

See how AI models tokenize your text in real-time

Help

Source text

Token laboratory

Analyze how different AI models (GPT-4, Claude, Llama) see your text. Optimize your prompts by reducing wasted tokens.

About this tool

The Token Visualizer shows exactly how AI models tokenize your text, highlighting each token in real time as you type. See the token count, boundaries, and an estimated cost so you can trim prompts and stay within context limits. Everything runs in your browser.

How to use it

Type or paste text. Enter the prompt or text you want to analyze.
Watch the tokens. Tokens are highlighted and counted live as you edit.
Check count and cost. Read the total token count and estimated cost per model.
Optimize your prompt. Trim or rephrase to reduce tokens and fit your context window.

Frequently asked questions

Is the Token Visualizer free?: Yes. It is free and open source with no login.
Which models are supported?: Common GPT and Claude tokenization schemes, computed client-side.
Is my text sent to a server?: No. Tokenization runs locally in your browser; your text never leaves your device.
Why do token counts matter?: Tokens drive both cost and context limits; fewer tokens mean cheaper calls and more room for content.
Is the count exact?: It is a close estimate using standard tokenizers; a provider's exact count can vary slightly by model version.