How to mass update records from a List View

Salesforce has a handy feature where you can edit records at once from a list view.

Click on the tab where you have or will create the list view. In this example, it's Contacts

Either select the view already created, or click Create New View

Give the view a Name (1) and tab to complete the Unique Name (2)

For the filter criteria, select what would comprise the view and this is the most important part: YOU MUST ADD A FILTER FOR THE RECORD TYPE IF THE OBJECT INCLUDES RECORD TYPES. You can only bulk update from list view if all the results are from the same record type. You must set a filter to insure this. Even if the object has just one record type and it's your default for all records, you must filter for record type in order to edit a list view.

Add the fields that will display in the view. Make sure the field you want to change is included.

Save the view. Now when you mouse over a field, you should see an edit icon.

Click the box at the top of the list to select all the records. If there are more records than can fit on a single screen, you may need to repeat this process multiple times.

Now, Double click on any of the values in the column you wish to change. Doesn't matter which one. You'll get the screen as shown. Enter the value you wish to change all the records to, and select the radio button for "All X selected records." Click Save.

Now click the refresh button and all records should show the new value saved for each.