Use OpenAI's official tokenizer tool to count tokens, see how your text is split, and estimate API costs for GPT-4o, GPT-4, GPT-3.5 and other OpenAI models.
OpenAI provides an official tokenizer tool on their platform. Use it to count tokens, visualize how your text is broken down, and estimate costs for GPT-4o, GPT-4, GPT-3.5 and other models.
Open OpenAI TokenizerInstantly see how many tokens your text contains. This helps you understand how much an API call will cost before you make it.
Estimate your API costs based on the number of tokens. OpenAI charges per token for both input and output, so knowing your token count helps you budget.
See exactly how your text is split into tokens with color-coded highlights. Understand which words become single tokens and which get broken into multiple pieces.
Click the button above to open OpenAI's official tokenizer on platform.openai.com. No account is needed.
Enter the text you want to analyze — prompts, documents, or any content you plan to send to the API.
See your total token count and a visual breakdown of how the text is split. Use this to estimate costs and optimize your prompts.
The OpenAI tokenizer is an official tool from OpenAI that shows how text is broken into tokens. Tokens are the basic units GPT models process — they can be whole words, parts of words, or punctuation. Knowing your token count helps you estimate API costs.
Tokens are pieces of text that AI models read and generate. A token can be as short as one character or as long as a full word. In English, one token is roughly 4 characters or about ¾ of a word. For example, 'hello world' is 2 tokens.
OpenAI charges based on the number of tokens you use. Both the text you send (input) and the response you receive (output) are counted as tokens. More tokens means higher cost, so counting tokens helps you control your spending.
Yes. English text is generally the most token-efficient. Other languages like Chinese, Japanese, and Korean typically use more tokens for the same content, which means higher API costs. Use the tokenizer to check your specific text.
Yes, OpenAI's official tokenizer tool is completely free to use. You don't need an account or API key — just open the tool, paste your text, and see the results instantly.
When you send text to an OpenAI model, the text is first converted into tokens. Tokens are the smallest units the model works with. Common words are usually a single token, while less common or longer words may be split into multiple tokens.
By understanding how tokens work, you can write more efficient prompts, better estimate costs, and make the most of your API usage.
Check how many tokens your prompt uses before making an API call. This helps you predict costs and avoid surprises on your bill.
Find out which parts of your prompt use the most tokens. Shorten or rephrase where possible to reduce costs without losing quality.
Every model has a maximum token limit. Use the tokenizer to make sure your input plus the expected response fits within the model's limit.
See how the same content uses different numbers of tokens in different languages. Helpful for planning multilingual AI applications.
