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Description
Count AI tokens and estimate API cost for selected text or pasted prompts. Exact OpenAI tokenization, runs entirely on your device. Count AI tokens and estimate API costs instantly, right where you read or write. Select text on any page, right-click, and choose "Count tokens for selection" - or just click the extension icon. The token count, word count, and estimated API cost appear in one click. WHY TOKEN COUNTS MATTER Every request to ChatGPT, GPT-5, GPT-4o, Claude, Gemini, or any LLM API is billed in tokens, and prompts that exceed a model's context window get silently cut off. This token counter shows you the numbers before you paste text into an AI chat or send an API request. WHAT IT DOES ✓ Counts tokens for selected text on any webpage (right-click menu or icon click) ✓ Exact OpenAI tokenization: the same o200k_base encoding GPT-5 and GPT-4o use, running locally ✓ Token estimates for Claude, Gemini, and DeepSeek models - always clearly labeled as estimates ✓ Estimated API input cost per request, using current model pricing ✓ Word count alongside token count ✓ Paste any text directly into the popup to count it 100% PRIVATE - NOTHING LEAVES YOUR DEVICE The tokenizer runs entirely on your computer. Selected or pasted text is never uploaded, logged, or sent to any server. No account, no signup, no tracking of your text. The extension works offline. PERFECT FOR ✓ Prompt engineers checking prompt sizes before production ✓ Developers estimating OpenAI / Anthropic / Google API costs ✓ Writers checking whether an article fits a ChatGPT context window ✓ Students and researchers measuring documents in tokens ✓ Anyone who keeps asking "how many tokens is this?" MORE TOOLS - FREE The full toolkit at freetokencounter.com (no signup) adds 650+ AI models with live pricing, exact Llama 3 / Qwen / DeepSeek tokenizers, a tokenizer visualizer with token IDs, chat conversation counting with real ChatML formatting, an image token calculator, a prompt caching savings calculator, context window comparisons, and a free LLM pricing API. HOW TO USE 1. Select any text on a webpage 2. Right-click and choose "Count tokens for selection" (or click the extension icon) 3. Read tokens, words, and estimated cost - switch models from the dropdown Note: Chrome blocks all extensions from reading browser pages (chrome://), the Chrome Web Store, and its built-in PDF viewer. On those pages, copy and paste the text into the popup instead.