Tiktoken Visualizer
See your text tokenized — colorful, instant, for GPT/Claude/Gemini
Tokens
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Characters
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Chars per token
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📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Free tiktoken visualizer — see tokens colored, live
Toololis Tiktoken Visualizer shows exactly how AI models tokenize your text. Each token gets a unique color, so you see where word boundaries are. Built on OpenAI cl100k_base encoding used by GPT-4, GPT-4o, and GPT-3.5.
How to use this tool
- 1
Paste text
Any prompt, code, or document. Tokens appear live as you type.
- 2
Watch the colors
Each token gets a unique color. Spaces, punctuation, word fragments all visible.
- 3
Toggle view modes
Colored, numbered, or raw-id view.
Why visualize tokens?
- Debug prompt length — see what parts of your prompt cost the most
- Understand token inefficiency — notice how JSON and numbers explode token counts
- Optimize for cost — rewrite expensive sections
- Learn how LLMs see text — tokens are the true input, not words
Frequently Asked Questions
What is a token?
A token is the smallest unit of text the AI model processes. Roughly 1 token equals 0.75 words in English.
Why do letters split weirdly?
Tokenizers use Byte-Pair Encoding (BPE). Common sequences become one token, rare ones split.
Why are numbers each a token?
GPT tokenizers are notoriously bad at numbers. This is why LLMs struggle with math.
Why is JSON so token-expensive?
Every brace, bracket, quote, and comma is its own token. A 200-char JSON can be 80-100 tokens.
Do Claude and Gemini tokenize differently?
Yes. We show cl100k_base (GPT-4/3.5/4o) exactly. Claude has a similar tokenizer. Gemini uses SentencePiece with 30 percent more tokens on average.
Is my text stored or sent?
No. Tokenization runs in your browser. Zero server calls.
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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.