The FITS Header editor is a useful tool for modifying Keyword values in the FITS header of one or more FITS files. It provides the flexibility to update, add, or delete Keywords.


The FITS Header editor consist of two sections:


  1. Click the Add files button to select one or more FITS files, displaying them in the Selected files list. Entries can be removed from the list using the Remove from list button, or by Clearing the entire list

  2. You have 5 identical rows to modify the FITS header of the Selected files:


    • To add a new FITS Keyword and its corresponding Keyword value, enter their values in the respective fields and select the Update option
    • To modify an existing FITS Keyword, enter Keyword in FITS Keyword and the new value in Keyword value. Then select Update 
    • To delete an existing FITS Keyword, enter the FITS Keyword and select Delete 


  1. Click Apply to modify the FITS header of all Selected files using the settings from the 5 rows. If you want to modify less than 5 rows just leave the other ones empty.