Private AI text tool
AI Token Estimator
Estimate plain-text token usage without sending your prompt to an API. The result is intentionally approximate and includes a context-window comparison.
Approximation only. For exact OpenAI request counts, use the official input token count endpoint, which requires sending the request content to the API.
Why this is an estimate
This page uses a simple local estimate of roughly four characters per token. It is useful for quick planning, but it is not a replacement for a provider's model-specific token-count endpoint.
OpenAI notes that request roles, tools, schemas, images, files, and changing model behavior can affect the exact input count. This tool stays private by avoiding an API request entirely.
Does this upload my files?
No. Everything on this page runs locally in your browser, so your files are never uploaded to a conversion server. Close the tab and nothing is left behind.
After any required processing engine has loaded, repeated conversions can keep working offline. You can verify the claim with the site's reproducible browser privacy audit.
FAQ
Is this an exact model token count?
No. This private estimator uses the common text-only approximation of about four characters per token. Exact counts depend on the model and full request structure.
Is my text uploaded?
No. Character, word, and estimated-token calculations happen entirely in your browser.
Why can an API report a different count?
Messages, roles, tools, schemas, images, files, and model-specific tokenization can add or change tokens beyond the plain text visible here.