Hello

No, diploma holders cannot get admission into NITs for B.Tech through JEE Mains because NITs do not offer lateral entry (direct second-year admission) for diploma students.

However, you can apply for first-year B.Tech admission via JEE Mains but your diploma marks will not be considered only your JEE Main rank will matter.

If you are looking for lateral entry (direct 2nd year admission) in B.Tech you should check state-level LEET (Lateral Entry Entrance Test) exams as NITs do not participate in lateral entry admissions.

Hope this gives you the clarity you need.