Claude TokenizerFree Online
Get accurate token counts for Claude models using the official Anthropic API.
Input Your Text
Text Analysis
How Claude Tokenization Works
Claude language models process text using tokens—common sequences of characters found in text datasets. These models learn statistical relationships between tokens and excel at predicting the next token in a sequence.
This tool uses the Anthropic API to provide accurate token counts, helping you understand how text is tokenized and optimize your API costs by knowing exactly how many tokens your prompts will consume.
Token Counting Accuracy
For Claude models, tokenization uses Anthropic's proprietary tokenizer. While the “1 token ≈ 4 characters” rule often applies to English text, precise counts vary by language, content complexity, and model version.
This tool provides the most reliable method by using the actual Anthropic API to count tokens, ensuring accuracy matching what you'll see in production.
Important Considerations
- • Code and non-English languages may have different token counts
- • Complex formatting affects tokenization patterns
- • Tokenization can evolve with model updates
- • API-provided counts are the most accurate method
- • Different Claude models may tokenize slightly differently
Advanced Claude Tokenizer Features
Our AI-powered claude tokenizer helps you write with confidence and clarity.
Accurate Tokenization
Uses the official Anthropic API to count tokens, ensuring accuracy matching production usage.
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.
How to Use the Claude Tokenizer?
Get accurate token counts for Claude models using the Anthropic API in three simple steps.
Choose the Claude model you want to tokenize for: Claude 3.5 Sonnet, Claude 3 Opus, Claude 3 Sonnet, or Claude 3 Haiku.
Paste or type your text into the input area. Character and word counts update in real-time.
Click "Count Tokens" to get the precise token count for your selected Claude model using the Anthropic API.
Why Choose Our Claude Tokenizer?
Accurate Tokenization
Uses the official Anthropic API to count tokens, ensuring accuracy matching production usage
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
Free Forever
100% free tool with no limits or registration required