Is this an exact tokenizer?
No. It uses a deterministic browser estimate that is useful for planning before you paste into a model.
Estimate tokens, words, characters, and reading size before sending a prompt to an AI model.
Tool workspace
Live preview/result
Estimated tokens: 15 Words: 14 Characters: 80 Estimated reading time: 1 min
How it works
Paste or enter your source material.
Adjust the fields for the model or workflow.
Review the live result and copy it when ready.
Use cases
FAQ
No. It uses a deterministic browser estimate that is useful for planning before you paste into a model.
No. The calculation runs locally in the page.
Related tools
Finance
Estimate API cost from input tokens, output tokens, request volume, and model pricing.
Planning
Check how much room your prompt, documents, and expected answer need inside a model context window.
Writing
Convert rough notes into a clean prompt structure with role, task, context, constraints, and output format.
Use the free browser tools, then save your best ideas into the AiverseWorld prompt library workflow.