How to capitialize first letter of TextFormField in flutter

Try below code hope its helpful to you. refer TextCapitalization Here

• Capital first letter TextCapitalization.words
• Capital each letter TextCapitalization.characters
• Capital first letter of textfield TextCapitalization.sentences
• Default lowercase letter of textfield TextCapitalization.none

Your Widget:

   TextField(
      textCapitalization: TextCapitalization.words,
      decoration: InputDecoration(
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(10),
        ),
        prefixIcon: Icon(
          Icons.search,
        ),
        hintText: 'Search',
      ),
    ),

Result screen using TextCapitalization.words:

Result screen using TextCapitalization.characters:

Result screen using TextCapitalization.sentences:

Result screen using TextCapitalization.none: