Claude Token Counter
Know how many tokens your Claude API request will use – before you send it.
What it does
Claude Token Counter is a small Windows program that sends your request to Anthropic’s official token counting service and shows how many input tokens it would use. Nothing is sent to the model, nothing is generated, and the count itself is free.
Use it to check prompt size, compare models, and plan costs and context limits for your own Claude API programs.
Features
MessagesSystem prompt plus a full multi-turn conversation (user / assistant).
Images & PDFsAttach JPG, PNG, GIF, WebP and PDF files and see what they cost.
ToolsAdd client tool definitions (JSON) with tool_choice.
ThinkingCount with adaptive or budgeted extended thinking.
Compare modelsOne click counts the same request on every model.
Raw JSONPaste any request body by hand for advanced cases.
Results & logTable of every count plus the full request and response.
Remembers everythingYour key, prompts and settings are restored next time.
How to use
- Paste your Anthropic API key at the top.
- Pick a model.
- Type your system prompt and message on the Messages tab (add images, tools or thinking on the other tabs if you need them).
- Click Count tokens.
Press F1 in the program for full help on every button and error message.
Requirements
- Windows 7 or later.
- An internet connection.
- An Anthropic API key from platform.claude.com.
Note: counting is free, but the API account needs a credit balance above zero. A Claude.ai Pro or Max subscription does not include API credits – they are bought separately in the Claude Console.Copyright © 2026 Lim Electronics · limelect.com
Uses the Anthropic API. Claude is a trademark of Anthropic. This program is not made or endorsed by Anthropic.