Best token counter AI tools

Markdown Studio is a free, AI-powered Markdown editor designed for developers and prompt engineers. It streamlines AI workflows with features like real-time token counting for LLMs (GPT-4, Claude, Gemini), AI prompt templates, and smart copy formats, all within a feature-rich, multi-tab editing environment that requires no login.

A free, online tool for developers and prompt engineers to accurately count tokens for various OpenAI models like GPT-4o, GPT-4, and GPT-3.5. It helps manage prompt length to stay within model limits, control API costs, and optimize interactions with LLMs. The tool operates entirely in your browser, ensuring your prompts remain private and are never transmitted over the internet.

A free, privacy-focused online tool for accurately calculating text token counts for a wide range of Large Language Models (LLMs). It supports popular models from OpenAI, Anthropic, Meta, Mistral, and more. By performing all calculations directly in your browser, it ensures your prompts remain confidential. This is an essential utility for developers, writers, and researchers to manage LLM context windows, prevent errors, and optimize API usage without compromising data security.