Photos are required upon arrival Vietnam’s airports only, so please remember to bring at least 2 photos of standard passport size (04*06 cm). Note: If you do not have time to prepare those photos before your departure, you can also get them taken at a Vietnamese airport for 2 USD or less per photo. https://vietnamvisa.govt.vn/vietnam-visa/faqs/
https://vietnamvisa.govt.vn/vietnam-visa/faqs/