Context Window Planner
Free online context window planner, no installation required. Visualize prompt usage in LLM context window
What is Context Window Planner?
Visualize how your system prompt, conversation history, and expected output fit within different LLM context windows.
How to Use
1. Select a model. 2. Enter system prompt, conversation, and expected output. 3. The visualization shows context window usage.
▶How are tokens estimated?
Approximately 1 token per 3.5 characters. For exact counts, use the Token Counter tool.
▶What happens if I exceed the context window?
A red warning appears. Shorten inputs or choose a model with a larger context window.
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