Accurate Tokenization
Uses the official Anthropic API to count tokens, ensuring accuracy matching production usage.
Claude Tokenizer
Get accurate token counts for Claude models using the official Anthropic API.
100% FreeMultiple Claude modelsAPI accuracy
Token counter
Count Claude tokens with the live Anthropic API.
Your text
0 chars · 0 words
Tokens—
Claude Sonnet 4.5
Characters0Including spaces
Words0Whitespace separated
Claude uses Anthropic’s proprietary tokenizer. Counts vary by language, formatting, and model version.
Capabilities
What this tool handles
Use Claude Tokenizer to check the input, tune the settings, and copy a clean output.
Multiple Models
Support for all Claude models including Claude 3.5 Sonnet, Claude 3 Opus, Sonnet, and Haiku.
API Accuracy
Token counts match exactly what you'll see when using the Anthropic API in production.
Workflow
Run it in three steps
Get accurate token counts for Claude models using the Anthropic API in three simple steps.
1
Select Claude Model
Choose the Claude model you want to tokenize for: Claude 3.5 Sonnet, Claude 3 Opus, Claude 3 Sonnet, or Claude 3 Haiku.
2
Enter Your Text
Paste or type your text into the input area. Character and word counts update in real-time.
3
Get Token Count
Click "Count Tokens" to get the precise token count for your selected Claude model using the Anthropic API.
Good for
Common jobs this tool supports
Accurate TokenizationUses the official Anthropic API to count tokens, ensuring accuracy matching production usage
Multiple ModelsSupport for all Claude models including Claude 3.5 Sonnet, Claude 3 Opus, Sonnet, and Haiku
API AccuracyToken counts match exactly what you'll see when using the Anthropic API in production
Free Forever100% free tool with no limits or registration required
FAQ
Answers before you run it
Practical notes about output, privacy, and common settings.
Claude models do not always count text exactly like GPT or Gemini models, so model-specific token counts are more useful.
Use next