How to Connect ChatGPT to Excel for Faster Text Writing and Summarization

You need to generate or summarize text directly within your Excel spreadsheets. Manually copying data between a web browser and your workbook is slow and disrupts your workflow. This article explains how to connect ChatGPT to Excel using two main methods. You will learn to use Power Query for structured data tasks and the official Microsoft Copilot for integrated AI assistance.

Methods for Integrating ChatGPT with Excel

You can connect AI capabilities to Excel primarily through automation or a native add-in. The Power Query method uses the OpenAI API to send data from your spreadsheet, process it with ChatGPT, and return the results. This is useful for batch operations like summarizing a column of product reviews or generating descriptions for a list of items. The Microsoft Copilot method is an integrated AI assistant available in certain Microsoft 365 plans that works directly within the Excel interface.

Before you start, you need an OpenAI API key for the Power Query method. You get this key from your account on the OpenAI platform. This key allows Excel to communicate securely with ChatGPT’s models. For using Copilot, you need a Microsoft 365 subscription that includes the Copilot license and the feature enabled in your Excel application.

Steps to Connect Using Power Query and the OpenAI API

This method is best for processing many rows of data at once. You will create a custom function in Power Query that calls the ChatGPT API.

1. Prepare your data and get an API key
   Place the text you want to process in a table in Excel. For example, put a list of long comments in column A. Then, sign in to the OpenAI website, navigate to the API keys section, and create a new secret key. Copy this key to a safe place.
2. Open the Power Query Editor
   Select any cell within your data table. Go to the Data tab on the ribbon and click From Table/Range. This opens the Power Query Editor window.
3. Create a custom function to call the API
   In Power Query, select Home > New Source > Other Sources > Blank Query. In the formula bar, replace the existing text with a function definition that uses Web.Contents to call the OpenAI API endpoint. The function must include your API key in the request headers and the prompt text from your table in the request body.
4. Invoke the custom function on your data column
   Go back to your main query with your source data. Add a new custom column. In the dialog box, select the function you just created. Choose the column containing your text as the function input.
5. Expand the results and load to Excel
   The new column will contain records from the API response. Click the expand icon in the column header and select the field containing the AI-generated text, often labeled ‘choices’. Finally, click Home > Close & Load to send the transformed data with the ChatGPT responses back to a new worksheet.

Steps to Use Microsoft Copilot in Excel

If your organization has Copilot, you can use it directly without API setup.

1. Verify and activate Copilot
   Open Excel and check for the Copilot icon on the ribbon. If you see it, your license is active. If not, contact your IT administrator to enable the service for your Microsoft 365 account.
2. Use Copilot for text tasks
   Select the range of cells containing the text you want to summarize or analyze. Click the Copilot icon on the ribbon. In the Copilot pane, type a natural language instruction like “Summarize these customer feedback points” or “Generate three marketing taglines based on these product features.”
3. Insert the generated content
   Review the AI-generated text provided by Copilot in the pane. Click the Insert button to add the text to a new cell or a specified location in your worksheet.

Common Mistakes and Limitations to Avoid

API Key Errors or No Response in Power Query

If your Power Query call fails, check your API key is correctly pasted into the header of the HTTP request. Ensure you have not exceeded your OpenAI account’s usage limits or rate limits. The function must point to the correct API endpoint URL, which is https://api.openai.com/v1/chat/completions for the ChatGPT models.

Copilot Option is Missing or Grayed Out

Microsoft Copilot requires a specific business or enterprise license. A standard Microsoft 365 Personal or Family subscription does not include it. The feature might also be disabled by your organization’s admin. You must be signed in with the work or school account that has the license assigned.

Processing a Very Large Dataset

Sending thousands of rows to an API can be slow and costly. The OpenAI API charges per token. For large jobs, process data in smaller batches. Use Power Query to filter your table or add an index column to break the work into chunks. Always test your query on a few rows first.

Power Query API vs. Microsoft Copilot: Key Differences

Item	Power Query with OpenAI API	Microsoft 365 Copilot
Setup Required	Manual setup of API key and custom function	No setup if licensed and enabled
Cost Model	Pay per API call via OpenAI billing	Fixed monthly fee per user
Best For	Automated, repeatable batch processing of table data	Interactive, ad-hoc analysis and text generation
Data Privacy	Data sent to external OpenAI servers	Governed by your Microsoft 365 compliance terms
Customization	Full control over prompts, models, and parameters	Limited to prompts within the Copilot interface

You can now bring AI-powered text generation into your Excel workflows. Use the Power Query method for automated, high-volume tasks like creating product descriptions from a catalog. Try Microsoft Copilot for quick, interactive summaries and insights directly in your spreadsheet. For advanced Power Query users, explore adding parameters to your function to dynamically switch between different AI models like GPT-3.5 and GPT-4.