Paste your text
Drop in a prompt, code file, or transcript. Everything is estimated locally in your browser.
MULTI-MODEL TOKEN COUNTER
AI Token & Context Window Counter
Estimate how many tokens your pasted text or code costs across GPT, Claude, and Gemini, and see what share of each model's context window it fills.
- Uses your inputs in a transparent calculation
- Instant result with practical next steps
- No signup required
Planning guidance only. Validate important decisions with customer evidence and your delivery team.
YOUR INPUTS
Build your result
Complete every field. The result updates only when you choose Calculate.
How it works
Estimate per model
We apply each model family's typical characters-per-token ratio to approximate Claude, GPT, and Gemini token counts side by side.
Compare against context windows
Your primary model's estimate is checked against its published context window to show remaining headroom.
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Frequently asked questions
How accurate is this token count?
It's a character-based approximation, typically within 10-15% of the real tokenizer. Use the provider's official tokenizer for billing-critical work.
Why do token counts differ between models?
Each model family uses a different tokenizer with different vocabulary and byte-pair encoding rules, so the same text produces slightly different token counts.
Does this tool send my text anywhere?
No. All counting happens in your browser; nothing is uploaded or stored on a server.
What counts toward the context window besides my text?
System prompts, prior conversation turns, tool definitions, and the model's response all share the same window, so leave headroom beyond this estimate.
How We Compare
| Feature | MVPHub | OpenAI Tokenizer | Google AI Studio |
|---|---|---|---|
| Compares Claude, GPT, and Gemini together | Included | Not included | Not included |
| Shows % of context window used | Included | Limited | Limited |
| No account or API key required | Included | Included | Limited |
| Runs entirely in the browser | Included | Included | Not included |
OpenAI's Tokenizer and Google AI Studio give exact counts for their own model family. MVPHub trades some precision for a fast, side-by-side estimate across all three major providers in one place.
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