Flash Fill in Excel is similar to Autofill except it will fill the values down based on a certain logic.
That logic is derived automatically once Excel sees a pattern in the data.

There are different ways you can use flash fill:
1. Use the Excel shortcut key for Flash fill: Control + E
2. Pull down the values with the fill handle and then select Flash Fill
3. Go to Home / Fill / Flash Fill
4. Start typing the 2nd value and once Excel recognizes the pattern, you will see the results shown in the cells in light grey. Just press Enter.

Excel Flash Fill not working? Check out 2:02.
You can only apply Flash Fill close and adjacent to your data set. You can also apply Flash Fill one column at a time. For example, to split the first name and last name, you can do the first name first and then do the last name separately. For Flash Fill to work it also needs to recognize a pattern. For really messy data, it might not find a consistent pattern.

If for some reason Excel doesn't show you the Flash Fill preview, it might be turned off in your Excel Options. To make sure Flash Fill is turned on go to File - Options - Advanced Editing Options - put a checkmark in the "Automatically Flash Fill" box.

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