Many of the sources featured here allow for searching in Thai. If you do not have a Thai keyboard, there are many online keyboards available, including Branah.com
Ohio University is not a member of the Hathi Trust. Nevertheless, the Hahti Trust does offer public access to millions of books and other publications in the public domain, including over 100,000 titles on Thailand. This includes rare Thai language imprints from the William Gedney Collection.
The Digital Library of Northern Thai Manuscripts features over 6,000 manuscripts inscribed in various languages and scripts, including Pali, Shan, Lan Na, Lao, Thai, Tham Lue, Thai Nithet, Tai Lue, Tai Khuen, and Burmese. It is the most ambitious Thai manuscript preservation project to date.
Chulalongkorn University Libraries - The Chulalongkorn University Intellectual Repository (CUIR) features almost 60,000 dissertations and theses completed at Chulalongkorn University, all of which are accessible to the public.
Thai Journal Online (THAIJO) indexes over 700 open source Thai language journals in digital format, including hundreds of academic publications.
Kyoto University - The Center for Southeast Asian Studies at Kyoto University has digitized three rare Thai language newspapers published between the 1920's and '40's, including หนังสือพิมพ์กรุงเทพวารศัพท์, หนังสือพิมพ์สยามราษฎร์, and หนังสือพิมพ์หลักเมือง.
The British Library is without question one of the finest libraries in the world, and as such, it is no small wonder that the BL is at the forefront in digitizing and preserving important collections from Thailand. Under the auspices of the Endangered Archives Program (EAP), the BL has undertaken a vast number of digitization projects with a special focus on Thailand, including:
Apart from the EAP, the British Library has digitized several other important sources, such as the Chakrabongse Collection of Thai Royal Letters, and rare illustrated manuscripts, including the Phra Malai.
Founded in 1934, Thammasat University is a public research university in Bangkok, Thailand, and home to one of the largest digital collections in Southeast Asia, including:
Since its establishment in 1900, the EFEO has made notable contributions to the preservation and study of the cultural heritage of Thailand. The Lanna Manuscripts project is a case in point. This open access database contains several hundred digitized manuscripts reproduced from forty-one monastic libraries in Northern Thailand and one public library in Bangkok (the Siam Society).
Almost 10 years ago, the staff at the Library of Congress field office in Jakarta, Indonesia launched an ambitious web archiving program. One such project involved capturing and archiving Thai website content (in Thai, with some English) on the Thai general elections of 2011, 2014, and 2019. The archive is fully searchable.
The Library of Congress field office in Jakarta also captured and archived Thai web content on the Royal Cremation Ceremony for H.M. King Bhumipol Adulyadej.
Thanks in large part to funds provided by the United States Department of Education TICFIA (Technological Innovation and Cooperation for Foreign Information Access) grant, Ohio University Libraries, in collaboration with Digital Initiatives, Lyrasis, the Internet Archive, the Southeast Asia Digital Library and Northern Illinois University, was able to digitize a selection of rare Thai-language materials from the David K. Wyatt Collection. The digital collection consists of King Chulalongkorn’s 24-volume diary, spanning the years 1876 to 1887, and more than thirty volumes of travel writings, which chronicle the King’s royal visits to India, Malaya, Singapore, Java, Western Europe, Russia, and the remote corners of Siam. The entire digital collection is freely available on the Internet Archive and the Southeast Asia Digital Library.
Chiang Mai University Library has digitized many unique collections, including hundreds of rare books. Chiang Mai University Special Collections houses several digital collections of note, including : the Digital Heritage Collection, featuring several hundred rare Thai books, Lanna Food, with a special focus on the history of Northern Thai cuisine, and Lanna Thai Songs, which explores the history and culture of Northern Thai music, complete with several digital audio files highlighting the range of Northern Thai music.
Chester Beatty Digital Collections houses a small, but rich and vivid collection of early Thai manuscripts.