Prompt Token Counter is a lightweight yet powerful utility that instantly shows the number of tokens in any block of text, based on your selected language model. The platform supports a wide range of LLMs including:
OpenAI’s GPT-4
GPT-3.5
Claude 1 and 2 (Anthropic)
Mistral
LLaMA
PaLM 2
This tool is essential for developers integrating LLMs into their apps, prompt engineers optimizing cost or performance, and researchers managing large-scale experiments. By pasting your prompt or input into the tool, you get an instant and precise token count based on the encoding rules of the selected model.
Features
1. Support for Multiple AI Models
Choose from a wide list of models including GPT-4, Claude 2, Claude Instant, LLaMA, Mistral, and more. Token calculation is based on actual tokenizer specifications for each model.
2. Real-Time Token Count
Paste any prompt or text into the input area, and instantly see how many tokens it contains. No lag or loading delays.
3. User-Friendly Interface
Simple, clean design with a clear layout for entering text and selecting models. Ideal for quick checks without distractions.
4. Cost Estimation (if supported)
Some versions include optional cost-per-token estimates based on OpenAI pricing or model provider data, helping users approximate API usage fees.
5. No Login or Sign-Up Required
Completely free and open to use. No registration or email required—just visit the site and start counting.
How It Works
Visit the Tool: Open prompttokencounter.com.
Enter Your Prompt: Paste your prompt, response, or any block of text into the input area.
Select a Model: Choose the model you are working with (e.g., GPT-4, Claude 2).
View Token Count: Instantly see the total token count displayed based on the model’s tokenizer.
Adjust Prompt (Optional): Modify your input to reduce tokens or fit within API constraints.
Use Cases
Prompt Token Counter is ideal for the following scenarios:
OpenAI Developers: Estimate prompt sizes and ensure they fit within GPT-4’s token limits (e.g., 8k or 32k contexts).
Prompt Engineers: Optimize prompts for performance and cost by reducing unnecessary tokens.
API Cost Control: Understand how long prompts affect pricing on platforms that charge per 1,000 tokens.
Claude or Mistral Users: Tailor inputs based on token rules of different AI systems.
Academic Researchers: Track prompt size in experiments involving LLMs.
Pricing
Prompt Token Counter is 100% free to use.
There are no hidden fees, sign-ups, or premium versions. It’s a completely open-access tool for developers and AI practitioners who need fast and accurate token metrics.
Strengths
Fast and Lightweight: Loads instantly with no bloat or unnecessary features.
Highly Accurate: Uses tokenizer rules aligned with each model’s specification.
Multi-Model Support: Great for those working across OpenAI, Anthropic, Mistral, and more.
Free and Open: No cost, no ads, no login.
Developer-Friendly: Excellent utility for LLM builders and experimenters.
Drawbacks
No API Access: Currently a browser-only tool with no public API for programmatic use.
No Prompt History: Does not store or recall previous inputs.
No Token Breakdown: Doesn’t show individual tokenization (yet), only the total count.
No Integration with IDEs: Meant for manual checking; not yet embeddable into VS Code or terminal.
Comparison with Other Tools
Prompt Token Counter vs. OpenAI Tokenizer
OpenAI offers a tokenizer demo via their API or Python library (tiktoken), but it requires local setup or coding. Prompt Token Counter works instantly in the browser with a clean UI.
Prompt Token Counter vs. GPT Token Calculator
Many token calculators only support OpenAI models. Prompt Token Counter supports Claude, LLaMA, and Mistral, making it more versatile for multi-model development.
Prompt Token Counter vs. LangChain Utilities
LangChain includes token-counting utilities for Python developers, but requires integration into a codebase. Prompt Token Counter offers a standalone, no-code option.
Customer Reviews and Feedback
While Prompt Token Counter doesn’t yet display user reviews on its homepage, the tool has been praised on social media and AI development communities:
“Prompt Token Counter is the simplest and fastest way to check tokens across GPT and Claude. I use it daily.”
– LLM Engineer
“Perfect for reducing API costs. Helped me trim prompts and avoid max-token errors.”
– Indie Developer
“Exactly what I needed—minimal, accurate, no signup.”
– AI Researcher
Conclusion
Prompt Token Counter is a must-have tool for anyone working with LLMs like GPT-4, Claude, or Mistral. Its fast performance, multi-model support, and simple interface make it ideal for developers, researchers, and prompt engineers who need to track token usage in real time.
Whether you’re optimizing prompts for cost, debugging context-length errors, or just curious about how your text breaks down, Prompt Token Counter gives you a reliable, free solution—no setup required.
Try it now at prompttokencounter.com and streamline your LLM workflow today.
