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.

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Input Text

GPT-4o — OpenAI

Token Count0 / 128,000

0.0% % Filled

0Token Count

128,000Context Window

0.0%Context Used

128,000Tokens Remaining

Audio/Video TranscriberAI Text SummarizerAI TranslatorAI

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 BrowseryTools. 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.