Yes, you can apply for a Japan visa for Indians without an invitation letter if you are visiting purely for tourism. In such cases, you must provide strong financial documents like bank statements, return tickets, and hotel reservations to prove self-sufficiency. However, if you are visiting relatives or attending a business meeting, an invitation letter from your host in Japan becomes mandatory. This letter helps verify your travel purpose and relationship with the inviter.

Many Indian tourists successfully apply without any invitation since the embassy accepts independent travelers with proper documentation. The Japan visa for Indians supports both invited and independent travelers, as long as their travel intentions are clear and documents are valid.