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Token Counter & Context-Fit Checker

Paste any text, prompt, or code file and get an instant token estimate — plus a live view of how much of each model's context window it fills. Everything runs in your browser; nothing is uploaded.

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Estimated tokens
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Characters
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Words

Context window fit

GPT-4.1 (1,000K)0.0%
Claude Opus 4.7 (1,000K)0.0%
Gemini 3.1 Pro (1,000K)0.0%
Mistral Large 3 (256K)0.0%
GPT-5.5 (200K)0.0%
Claude Sonnet 4.6 (200K)0.0%
GPT-5.4 (128K)0.0%
DeepSeek V3 (chat) (64K)0.0%

Token counts are estimates (typically within ±15%) — every model family tokenizes differently. Everything runs in your browser; your text is never uploaded.

How to Count Tokens and Check Context Fit

Estimate tokens for any text and see how much of each AI model's context window it uses.

  1. 1
    Paste your textDrop in a prompt, a document, or a code file. Everything runs in your browser — nothing is uploaded.
  2. 2
    Read the estimateYou get estimated tokens, characters, and words. Token estimates are typically within ±15% of the model's real tokenizer.
  3. 3
    Check the context-fit barsEach bar shows what percentage of a model's context window your text fills — green means comfortable, red means you're near the limit.
  4. 4
    Plan your promptIf a document overflows the window, split it, summarize sections first, or pick a model with a larger context window.

Frequently Asked Questions

Every model family uses its own tokenizer, so the same text produces slightly different counts on GPT, Claude, and Gemini. Our heuristic (about 4 characters per token for English, less for code and CJK languages) lands within roughly ±15% — enough for planning and budgeting.

It's the maximum number of tokens a model can consider at once — your prompt, the conversation history, and the reply all share it. Think of it like RAM for a conversation: when it's full, something has to be evicted.

Tokenizers split code on symbols, brackets, and unusual identifiers, so code averages fewer characters per token than natural English — meaning more tokens for the same character count.

No. The counter runs entirely client-side in your browser. Nothing you paste is transmitted, logged, or stored.

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