Claude Token Counter
A free browser-based tool by Simon Willison that counts tokens for Claude AI models, helping developers estimate API costs and context window usage.
At a Glance
About Claude Token Counter
Claude Token Counter is a free, browser-based utility built by Simon Willison that lets developers and users count the number of tokens in text for use with Anthropic's Claude AI models. It runs entirely in the browser, requiring no server-side processing, and provides instant token counts to help estimate API costs and manage context window limits. The tool is part of Simon Willison's broader collection of open-source utilities hosted at tools.simonwillison.net.
- Browser-based tokenization: Paste or type text directly into the tool and get an immediate token count without any sign-up or API key required.
- Claude model compatibility: Counts tokens specifically as Claude models interpret them, giving accurate estimates for Anthropic API usage.
- Cost estimation support: Helps developers plan and budget API calls by understanding token consumption before sending requests.
- No installation required: Access the tool directly in any modern web browser at tools.simonwillison.net/claude-token-counter.
- Free to use: The tool is completely free with no usage limits or account requirements.
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Pricing
Free
Completely free browser-based Claude token counter with no usage limits or account required.
- Instant token counting
- Claude model compatibility
- No sign-up required
- Unlimited use
Capabilities
Key Features
- Browser-based token counting
- Claude model token compatibility
- Instant token count results
- No sign-up required
- No server-side processing
- Free to use