How to save CSV file as UTF-8 with Notepad

The steps are as given below:

1. Open the CSV file with Notepad.
2. Navigate to File > Save As option. A screenshot of the menu is as shown below:Notepad File Menu
3. Next, select the location to the file. The Save As window appears as shown below:Save As option in Notepad
4. Select the Save as type option as All Files(*.*).
5. Specify the file name with .csv extension.
6. From Encoding drop-down list, select UTF-8 option.
7. Click Save to save the file.

This way, you can save a file as a UTF-8 encoded with Notepad.

Sources:

Saving CSV/Excel file as UTF-8 Encoded – WooCommerce Product Import Export