Written by the Thai Legal & Immigration legal team · Last reviewed · Editorial policy
Immigration offices can convert certain stays — for example tourist or visa-exempt entries — into a Non-Immigrant category such as O (retirement or marriage) or ED, saving a trip abroad. The office requires enough permitted stay remaining on your current stamp, typically at least 15 days, and full evidence for the new category.
Not every conversion is possible: some categories, such as Non-B for employment, are generally applied for abroad. We confirm which conversions your local office accepts before you rely on one.
What we handle
- Feasibility check by category and office.
- Evidence preparation for the new category.
- Conversion filing and follow-up.
- Subsequent one-year extension planning.
How the process works
Step 1
Feasibility
Current stamp and target category reviewed.
Step 2
Preparation
Documents for the new category assembled.
Step 3
Conversion
Application filed; initial 90-day Non-Immigrant stay granted if approved.
Step 4
Extension
One-year extension filed when eligible.
Not sure this route fits you?
Get a Free Preliminary Eligibility Review from our licensed team.
Why are applications refused, and how do we prepare?
| Common refusal reason | How we prepare |
|---|---|
| Not enough time left on the current permission of stay | We file early, with all documents prepared. |
Counsel's note
Timing is critical. Starting with too few days left can force a border exit mid-process.
Frequently asked
Can I change from tourist to work visa in Thailand?
How long does a conversion take?
Why clients choose us
Six licensed Thai attorneys
Including Notarial Services Attorneys registered with the Lawyers Council of Thailand.
77 provinces covered
Offices in Bangkok and Khon Kaen with field representatives nationwide.
Your passport stays with you
We work from copies and only handle originals for filings you approve.
Honest assessment first
A Free Preliminary Eligibility Review tells you your options before any engagement.
Sources & references
- Thai Immigration Bureau (official portal) — checked 2026-11-03
General information only, not legal advice. Immigration decisions rest with the Thai authorities. See our disclaimer.