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
Result
Estimated tokens
15
Words
14
Characters
80
Reading time
1 min
How it works
Enter your numbers — text length, token counts, model, or request volume.
The result updates instantly as you type, no submit button needed.
Read the breakdown, then adjust inputs to compare scenarios.
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.