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Since 2016, the Embassy of India in Bangkok and the Chaing Mai Consulate no longer accept applications from non-Thai nationals or permanent residents. Foreigners who are in Thailand on tourist visas can only apply online for a visa, which is limited to a 30-day visit.
As India does not give in-country extensions of tourist visas, alternatives would be making application from other countries, such as Cambodia, Myanmar, Viet Nam, or Indonesia.