Technical Control: How GPTLocalhost Secures Your Data

Most AI tools for Word are “Cloud Add-ins,” which act as windows to a remote server. GPTLocalhost is built differently. We utilize a specific architecture designed for local development and private sideloading, ensuring your data remains entirely under your total control.

The Microsoft “Local-Only” Advantage

According to the official Microsoft Office Add-in specification, the platform allows for “Localhost” manifests. This unique technical feature was originally designed by Microsoft to let developers build and test Add-ins locally without ever deploying them to a public cloud or external server.

GPTLocalhost leverages this specific loophole to provide 100% data ownership. By running as a local Add-in that communicates exclusively with your own machine, we guarantee:

  • No External Endpoints: Your text is never sent to a third-party API or cloud processing center.

  • The “Development” Security Standard: We treat your daily workspace with the same isolation that engineers use for top-secret prototypes.

  • Complete Private Ownership: Because the Add-in exists and runs entirely on your local server, you maintain absolute authority over your intellectual property.

Why This Matters for Professionals

For legal, medical, and financial professionals, a “Privacy Policy” is just a promise—but a local manifest is architectural proof. By utilizing Microsoft’s own local-only specs, GPTLocalhost provides total control over your data, bypassing the cloud vulnerabilities that affect tools like Microsoft Copilot and ChatGPT.