Install GPTLocalhost Add-in as a local Word Add-in if you use Windows.

  • This manual step is required for any local Word Add-ins, according to Microsoft.
  • On Windows, “net share” is required for Microsoft Word to access the local Word Add-in.
  • In Microsoft Word, please install GPTLocalhost Add-in under “Developer Add-ins” to make it run locally.

  • After installation, you can now connect your favorite LLM server in Microsoft Word directly and locally.

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For more demos, please check our YouTube channel.

Installing GPTLocalhost

Use IBM Granite 4 for Contract Analysis

Seamless Model Switching

Register Your Device to Be Completely Offline

Apple Intelligence in Microsoft Word

Automatic Markdown Format Conversion

Empower Your Team on Your Intranet

Intranet solution: LocPilot

Using AnythingLLM in Microsoft Word

Using LM Studio in Microsoft Word

Using Transformer Lab in Microsoft Word

Using Msty for Multiple LLMs in Microsoft Word

Using Ollama in Microsoft Word

Using llama.cpp in Microsoft Word

Using LocalAI in Microsoft Word

Using KoboldCpp in Microsoft Word

Using Xinference in Microsoft Word

Using OpenLLM in Microsoft Word

Using LiteLLM in Microsoft Word

Using Microsoft Foundry Local for GPU and CPU



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.