ChatGPT for Excel warns against raw file uploads

Experts demonstrate that uploading raw Excel workbooks to ChatGPT can produce incorrect analyses and expose sensitive data. Leila Gharani shows how the AI struggles with complex formulas, hidden sheets, and formatting nuances, leading to broken calculations and potential hallucinations.

Embedding the AI directly inside Excel via the ChatGPT for Excel add‑in avoids re‑uploading files, keeps data within the Microsoft environment, and improves security and compliance. A recommended workflow includes inspecting and cleaning the workbook, providing clear instructions, and anonymising confidential information before using the model.

The guidance aims to help users obtain accurate, up‑to‑date insights while reducing the risk of data leaks and erroneous business decisions.