AI
Context Window Calculator
See how much of a model's context window your text fills. Visualize usage instantly. Runs on your device — nothing is uploaded, nothing is stored.
GPT-4o — OpenAI
Token Count0 / 128,000
0.0% % Filled
0Token Count
128,000Context Window
0.0%Context Used
128,000Tokens Remaining
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About Context Window Calculator
See how much of a model's context window your text fills. Visualize usage instantly.
Context Window Calculator is a free tool in the AI Tools category on Filepad. It runs entirely in your browser: what you give it is processed on your own device and is never uploaded to a server, there's no registration, no ads and no watermarks, and it keeps working with no connection once the page has loaded.
Practical examples
- See how much of a model's window a long contract actually consumes.
- Catch a context overflow before it truncates your prompt silently.
- Plan how much retrieved context you can afford alongside the answer.
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