It's not entirely clear why Redmond waited so long to add spellcheck and autocorrect to Notepad, or why they decided to do it now.

Extended spell check features in Google and Microsoft web browser settings share personal data, including passwords.

Microsoft has finally added spell check to Notepad after more than 41 years, and the new feature appears to have rolled out to Windows 11 users.

Microsoft continues to add new features to the Windows Notepad, today announcing a preview release with built-in spellchecking and an autocorrect feature.