Many people wonder whether it is necessary to submit a cover letter when applying for a visa.
The answer is: not mandatory. Embassies or consulates do not require it as a standard document for visa applications.

However, it is recommended in cases where you want to provide additional information to help the officer understand your reasons and the purpose of your visa application.

When Should You Write a Cover Letter?

1. Complex or Multiple Jobs
If you hold multiple positions or have a complex work situation, a cover letter can help explain your responsibilities and commitments clearly to the visa officer.
For example, if you are starting a new job or changing jobs, the letter clarifies your current employment status.

2. Explain Relationship with the Sponsor
If you have a sponsor, such as a friend, relative, or spouse, the cover letter can clearly describe your relationship.
This helps the officer understand that your visit has a legitimate purpose.

3. Explain Reasons for Returning to Thailand
If you have definite plans to return to Thailand, or responsibilities such as family, work, or property, the cover letter can confirm that you do not intend to overstay your visa.

4. Complex Travel Plans
If your travel involves multiple countries — for example, traveling to the UK and then continuing to the Schengen area — the cover letter allows you to explain your travel itinerary in detail.
This helps the officer see the clarity and logic of your travel plans.

Summary

Although a cover letter is not a mandatory document, preparing one can increase the credibility of your visa application.
It is particularly helpful when your work is complex, you have a sponsor, or your travel plan involves multiple countries.
A short, clear, and precise letter can help the visa officer understand your purpose and make it easier to approve your application.