How to Find the Data Source of a Power BI Report

Inheriting a Power BI report without any documentation can feel like being handed a car with no keys and a locked hood. You know it’s powerful, but you have no idea what makes it run. When a visual stops working or data fails to refresh, your first question will almost always be, "Where is this data actually coming from?" This guide will show you several straightforward methods to find the data source for any Power BI report, whether you have the original file or just access to the published dashboard.

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Why You Need to Find the Data Source

Before we get into the "how," let's quickly cover the "why." You'll likely need to track down a data source for a few common reasons:

• Troubleshooting Refresh Errors: The most common reason. A report fails to refresh because a file path changed, a database password was updated, or a server is down. You can't fix it if you can't find it.
• Updating or Extending a Report: You might want to add a new column from the source data or combine it with another dataset. To do this, you need access to the original source.
• Validating Data Accuracy: If a number on a report looks questionable, you might need to trace it back to the source to confirm its accuracy and understand the logic used to pull it.
• Migrating Reports: When moving data sources, like migrating an on-premise SQL server to Azure, you need to identify all reports connected to it to update their connections.

Figuring out the data source is the first step to becoming the owner of an existing report, not just a viewer. Let's walk through how to do it.

Method 1: The Direct Approach in Power BI Desktop

If you have the original Power BI project file (with a .pbix extension), this is the easiest and most definitive way to find your data source. The PBIX file contains everything: the data model, the report visuals, and the connection details for a report's queries.

Follow these simple steps:

Step 1: Open Power Query Editor

First, open your .pbix file in Power BI Desktop. In the main Home tab of the ribbon at the top of the screen, you’ll see a button labeled Transform data. Click it.

This action will launch the Power Query Editor, a powerful tool within Power BI where all the data import and transformation steps are defined. If the report pulls data from anywhere, the connection was set up here.

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Step 2: Go to Data Source Settings

Inside the Power Query Editor, look at the ribbon again. In the Home tab, click on Data source settings.

A new window will pop up, itemizing every single data source connection used in the current file. This is your definitive list. It will tell you the type of source (e.g., Excel workbook, SQL database, SharePoint folder) and the path or server address.

For example, you might see:

• An Excel File: C:\Users\sandra\Documents\Quarterly-Reports\Sales-Data-Q3.xlsx
• A SQL Server: SRV-SQLPROD-01\SALES
• A Web API: https://api.somecompany.com/v2/data

From this window, you can also change the source if you need to (for example, to point the report to a new file location) or clear permissions if you're having login issues.

Step 3: Alternative Desktop Method: Check a Specific Query’s Source

Sometimes a report has dozens of sources, and you want to know the source for just one specific piece of data. This is also handled in the Power Query Editor.

1. On the left side of the Power Query Editor, select the query (the dataset) you're interested in.
2. On the right side, in the Applied Steps panel, find the very first step, which is almost always named Source. Click on it.
3. With the Source step selected, look at the formula bar just above the data preview. You will see the Power Query (M) formula that defines the connection. This is the raw code defining the data source and will contain the file path or server name you're looking for.

For instance, for an Excel file, the formula might look like this:

= Excel.Workbook(File.Contents("C:\Reports\Finance\Revenue.xlsx"), null, true)

This tells you exactly which file is being used.

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Method 2: Investigating in Power BI Service

What if you don’t have the .pbix file? For many users, a Power BI report is just a link your boss sends you. In these cases, you only have access to the published report in your web browser through the Power BI Service. While your options are more limited here, you can still do some effective detective work.

Step 1: Find the Associated Dataset

A published Power BI report is connected to a published dataset. The dataset is what actually holds the data and the connection info. In your workspace, the report and its corresponding dataset usually have the same name.

Navigate to the workspace where the report lives. Find the dataset, then click the three-dot menu (...) next to its name and select Settings.

Step 2: Inspect the Dataset Settings

The settings page is your best bet for finding source information inside the Power BI Service. Check these two sections:

• Gateway connection: If you see a section for a gateway, it tells you the report is connecting to an on-premise data source. This means the data isn’t in the cloud, it’s living on a server computer inside the office. The Gateway name may even clue you as to which server it is (e.g., "Finance Department Gateway"). While you won't see the full file path or server name, it narrows your search considerably.
• Data source credentials: This section lists the cloud data sources connected to the dataset. For security reasons, it won't show you passwords, but it will confirm the source type (e.g., SharePoint, Azure SQL Database) and often reveal specifics like a server name or a website URL that you can use to identify the source.

Step 3: Use the Lineage View

Power BI Service has a great feature for visualizing data flows called Lineage View. It shows you exactly how dashboards, reports, datasets, and data sources are all connected.

To access it, navigate to your workspace and click the View button at the top of the file list (it might look like an icon with a list). Select Lineage.

You'll see a flow chart. On the far right is your report. Following the arrow to the left will show you the Dataset it relies on. Following the next arrow will lead you to a card representing the data source itself. This card explicitly lists the data source type (e.g., SQL Server) and the server's name. It's the most visual way to confirm a source without ever downloading the PBIX file.

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Method 3: The "Break Open the Box" Technique (Advanced)

If you have the .pbix file but can't open it for some reason (maybe it's corrupted, or you're using a Mac), there's one last trick to try. This one is a bit more technical, so be sure to work on a copy of your file, not the original.

A .pbix file is actually a compressed archive file, just like a .zip folder. You can look inside it if you change its extension.

1. Make a copy of your Power BI report file (e.g., MyReport-Copy.pbix).
2. Rename the file and change the extension from .pbix to .zip (e.g., MyReport-Copy.zip). Windows may warn you about making the file unusable, accept the warning.
3. Now, you can unzip the file using Windows' built-in tool or a program like 7-Zip. This will create a folder with numerous subfolders and files.
4. Open the extracted folder and look for the DataMashup file. This binary file contains the Power Query information. You can't read it with a text editor, but its contents hold the key.
5. While the DataMashup file itself isn't readable, you can open it with a tool like Notepad++ and sometimes find the source URLs or file paths in plain text strings scrambled among other code. A simple search (Ctrl+F) for .xlsx, http, or sql might be enough to reveal what you need to know.

This is definitely a last-resort approach, but it can be a lifesaver when you're completely stuck.

Final Thoughts

Chasing down the source of a Power BI report is a common task for anyone working with data. By knowing where to look in both Power BI Desktop and the Power BI Service, you can quickly find the answers you need to troubleshoot, update, or validate your reports with confidence.

The complexity of tracing these connections reveals how much energy can be spent just on reporting fundamentals. This is why we created Graphed - to eliminate that friction. Instead of digging through settings menus, we allow you to securely connect your sources like Google Analytics, Shopify, and Salesforce just once. After that, all your data is in one unified place, ready for you to create dashboards and reports just by asking questions in plain English. No more hunting for file paths or server names, you get immediate answers from data sources you already know and trust.