Yes, an invitation letter should be on official letterhead if issued by a company or organization, but personal invitations do not require it.
When letterhead is required
For business or official visits, invitation letters are usually printed on company or institutional letterhead. This helps confirm that the issuing entity is legitimate and can be verified if needed.
What letterhead includes
The letterhead typically includes the organization’s name, address, and contact details. It also adds credibility to the document and is often expected for business visa applications.
Personal invitations
For personal or family visits, a handwritten or typed letter without letterhead is generally acceptable. What matters more is that the host’s identity and address can be clearly verified.
Regardless of format, the letter should be signed and include accurate, consistent information that matches the rest of the visa application.