How to Safely Open a CSV file in Excel

True or False: Opening a CSV file in Excel can change the data it contains. If you answered true, then you know how Excel automatically tries to change numbers and dates in your data into a format that it thinks you would prefer.

Excel is only trying to help

This might be a nice feature if you're simply going to work with the data in Excel. But, if you plan to import the data into another system (e.g., xAPI data into Watershed), chances are these automatic formatting changes will make your data incompatible with the import template that's meant for another system.

The changes Excel makes to your data might cause a failed import—or worse, the import will succeed, but the reformatted data will be erroneous. Switching the order of days and months in a date, for example, could significantly impact how the date is interpreted by other systems.

How to open your CSV file safely

The solution is to tell Excel that your CSV file is made up of text fields before you import it. This will stop it trying to change numbers and dates, or at least it will ask your permission before changing them.

1) Open a new, blank worksheet in Excel.

2) In the Data tab, select From Text.

3) Select your CSV file and click Import.

4) Complete Steps 1 and 2 of Excel's Text Import Wizard. Make sure you select Comma as the only delimiter.

5) In Step 3 of the Text Import Wizard, click on the first column in the Data preview, press the shift key, and click on the last column (you might need to scroll to the right to see it). This will select every column. Now, change the Column data format to “Text” and select Finish.

6) Click OK in the next pop-up window. Your file is now open in Excel without any changes to the data format.

7) Excel may still try to warn you that the data is not in the format it thinks you should be using. Just ignore those warnings; don't change the data format.

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