🎯

🤖 AI / LLM HOT

LLM Token Counter

Count tokens for ChatGPT, Claude, Gemini, Llama — accurate, free, runs entirely in your browser.

All tools Browser-only

Model Text

Tokens

Characters

Words

Input cost

⚡ Runs 100% in your browser — nothing is sent to a server

Accuracy notes

OpenAI (GPT-5, GPT-4o, mini): 100% accurate — uses the official tokenizer.
Llama, DeepSeek: uses the cl100k_base tokenizer, ~98% accurate.
Claude, Gemini: estimated (Anthropic and Google do not publish their tokenizers). ±10% margin, good enough for cost estimates.
Vietnamese typically uses 1.5-2× more tokens than English for the same content.

Why count tokens?

Every LLM API charges by tokens, not words. Knowing the count before you send a large prompt lets you:

Estimate cost before running thousands of requests
Make sure your prompt fits the model's context window
Compare which model is more "token-efficient" for your text

How to use

Pick the model you plan to use
Paste text into the input box
Token count + cost estimate update live
Hit "Copy share link" to send to your team

Who this is for

Developers using ChatGPT/Claude/Gemini daily, AI engineers building RAG/agents, anyone paying LLM API and wanting quick metrics.

FAQ

Is my pasted data sent anywhere?

No. The tool runs 100% in your browser — no HTTP requests to TopDev servers or any AI provider. You can disconnect from the internet to verify.

Is this tool free forever?

Yes. All TopDev tools are free, no signup required, no usage limits.

Related tools

See all tools →

💰

API Cost Calculator

Estimate monthly/yearly LLM API spend. Compare which model is cheapest.

✨

Prompt Builder

Compose well-structured prompts. 6 templates for common tasks.

NEW

📜

Markdown Preview

Render markdown live — paste ChatGPT/Claude output. GFM, tables, code blocks.

NEW

🆚

AI Model Comparison

GPT-5, Claude 4.7, Gemini 2.5, Llama 4, DeepSeek — context, pricing, modality (2026).