Does Context Window % upload my file or text to Tool-You servers?

No. Context Window % runs in this browser tab. Files stay on the device. Limit note: Tokens ≥ 0, window > 0. Local estimate only.

Should I use Token Estimate (Chars) instead of Context Window %?

Use Context Window % when you need How full a context window is. Use Token Estimate (Chars) when you need Rough tokens from character count. They share a category (AI) but not the same job.

Context Window %

How full a context window is.

Computes tokens / window × 100 and remaining slots. Unlike Token Estimate this needs a window size. Unlike Truncate by Tokens this does not cut text. Local math only.

What Context Window % does

Computes tokens / window × 100 and remaining slots. Unlike Token Estimate this needs a window size. Unlike Truncate by Tokens this does not cut text. Local math only.

Context Window % sits in the AI group on purpose. It is not Token Estimate (Chars) (Rough tokens from character count.) and not Truncate by Tokens (Cut text to an estimated token budget.). Choose this page when you need How full a context window is. If you stretch Context Window % into a neighbor’s job, the result will look wrong even though the site chrome looks the same.

How to use Context Window %

Keep this tab on Context Window % (/ai/context-window-pct). Pasting into the wrong AI tool (for example Token Estimate (Chars)) changes the job.
Paste or type the input Context Window % expects. Path hint: ai · context window pct. How full a context window is.
Apply the Context Window % action only. Truncate by Tokens is a different transform (Cut text to an estimated token budget.). Computes tokens / window × 100 and remaining slots. Unlike Token Estimate this needs a window size. Unlike Truncate by Tokens this does not cut text. Local math only.
Copy the output of Context Window % if you need it elsewhere. Size/complexity still follows: Tokens ≥ 0, window > 0. Local estimate only.
If the text job is actually Rough tokens from character count., leave Context Window % and open Token Estimate (Chars).

When not to use Context Window %

Skip Context Window % when a neighbor tool matches better — start with Token Estimate (Chars) or Truncate by Tokens — or when the description already warns the job will fail. In the tool’s own words: Computes tokens / window × 100 and remaining slots. Unlike Token Estimate this needs a window size. Unlike Truncate by Tokens this does not cut text. Local math only.

Questions about Context Window %

What does Context Window % do that other AI pages on this site do not?: Computes tokens / window × 100 and remaining slots. Unlike Token Estimate this needs a window size. Unlike Truncate by Tokens this does not cut text. Local math only. Short version: How full a context window is.
Does Context Window % upload my file or text to Tool-You servers?: No. Context Window % runs in this browser tab. Files stay on the device. Limit note: Tokens ≥ 0, window > 0. Local estimate only.
Should I use Token Estimate (Chars) instead of Context Window %?: Use Context Window % when you need How full a context window is. Use Token Estimate (Chars) when you need Rough tokens from character count. They share a category (AI) but not the same job.
What are the limits of Context Window %?: Tokens ≥ 0, window > 0. Local estimate only. Also: Computes tokens / window × 100 and remaining slots. Unlike Token Estimate this needs a window size. Unlike Truncate by Tokens this does not cut text. Local math only.