How do I set a file to UTF-8?

From Excel

1. Open the file in Excel
2. Click on File > Save as.
3. In the Save As dialog box, choose the location where you want to save the file.
4. From the File Type drop-down menu, select CSV UTF-8 (comma-delimited) (*.csv).
5. Give your file a name and click Save.

From Google Sheets

1. Open the file in Google Sheets.
2. Click on File > Download > Comma separated values (.csv)

From Notepad++

1. Open the file in Notepad++ :
2. Go to the Encoding menu at the top of the window and select Convert to UTF-8 (without BOM) if it is not already selected.
3. Save your file

Check

To check that the file is encoded in UTF-8, you can :

• Use Notepad++:
  • Open the file in Notepad++.
  • Check the encoding by looking at the status bar at the bottom of the Notepad++ window. It should say UTF-8.

• Use an online validator :
  
  • W3C Markup Validation Service.