This type of visa is issued to applicants who wish to enter Thailand for the following purposes:
2.1 ED Visa is valid for a single entry for education purposes only.
2.2 ED Visa is valid for 90 days from the date of issuance. Travellers must enter Thailand within the said 90-day period. They will be allowed to stay in Thailand for a period of up to 90 days, counting from the date of entry. During the 90-day period of stay, if they wish to leave and re-enter Thailand, they are required to apply for a re-entry permit (single or multiple) before departure. If they leave Thailand without a re-entry permit, the current stay permit shall be considered void.
2.3 Extention of visa is possible. Those qualified may obtain an additional one-year stay permit, counting from the date of entry to Thailand. The extension of stay is at the discretion of the immigration officer. Extension application can be made at the Office of Immigration Bureau (visit www.immigration.go.th for more information)
2.4 If the ED Visa holder breaches the entry conditions, the stay permit will be revoked and he/she will be prohibited from entering Thailand in the future.
CLICK HERE for E-Visa USER MANUAL