AI DEVELOPMENT WORKSPACE
Token Count Estimator
Get a clearly labeled text heuristic, without a model tokenizer.
Heuristic estimate only. No model tokenizer, chat overhead or context-fit guarantee. Tokenization differs by model.
Input is processed on this site only when you run the tool. The application does not save inputs or results.
input.txt
Result result.json
A little clarity goes here.
Run the tool to see your result.
Result preview
UTF-8 text, at most 65536 bytes per input. Tab leaves the editor. Plain text disables syntax colors. Browser textareas may normalize line endings to LF.
{"estimate":{"inputMode":"text","options":[],"inputLabels":[]}}{"estimate":{"input":"A small fictional prompt.","options":[]}}A QUICK WALKTHROUGH
A familiar workflow,
with room to focus.
Paste the raw text you want to inspect.
Estimate to see UTF-8 bytes, Unicode code points and a rough token figure.
Use the intended model tokenizer for exact token counts.
When to use Token Count Estimator
Get a rough text-size planning hint before checking the exact tokenizer of your intended model.
Read the result
estimatedTokens is ceil(Unicode code points / 4), not a tokenization result. Languages, code, emoji and model conventions can differ substantially; never use this figure as a billing or context-fit guarantee.
SEE IT IN PRACTICE
Worked examples
Sample input. A result you can inspect.
Estimate example
Input
A small fictional prompt.
Expected result
{"method":"ceil(unicodeCodePoints / 4)","estimatedTokens":7,"unicodeCodePoints":25,"utf8Bytes":25,"exact":false,"limitations":"Heuristic only. Tokenization differs by model, language and content. No tokenizer, chat overhead, context-fit or billing guarantee."}{"kind":"metrics","title":"Approximate token count","metrics":[{"label":"Estimated tokens","value":"7"},{"label":"Code points","value":"25"},{"label":"UTF-8 bytes","value":"25"}],"note":"Heuristic only. Tokenization differs by model, language and content. No tokenizer, chat overhead, context-fit or billing guarantee.","schema":1}Formats, limits and common errors
Treat estimatedTokens as a rough planning hint only; bytes and code points are different measures.
- Heuristic estimate = ceil(Unicode code points / 4). Empty text gives zero. At most 65,536 input bytes.
- This is not a model tokenizer. Languages, code, emoji, whitespace and models can differ substantially. No exact count, guaranteed range, context fit, billing estimate or chat overhead is provided.
- Offline means no external AI call. Your input still goes to this site’s PHP server when you run the tool.
- Input: 65,536 UTF-8 bytes per text field. Output: at most 524,288 UTF-8 bytes; serialized responses have a separate 1 MiB ceiling. Size/work failures return no partial result.