Runs entirely in your browser — we never see your data.

Prompt Token Counter

Estimate token counts and API costs for your prompts across Claude, GPT-4o, and Gemini models. Context window usage visualized. Runs entirely in your browser.

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Tokens (est.)

0

Characters

0

Words

0

Input Cost

—

Context window usage (Claude Sonnet 4.6)0.00% of 200.0K

Token counts are estimated using a general-purpose heuristic (~4 chars/token). Exact counts vary by model tokenizer. All computation happens in your browser.

Related Guide

Mastering Prompt Engineering for Production AI Apps