TDAC or THIM? Which One Should You Use in Thailand?

A complete guide to understanding the two official Thai Immigration applications and choosing the right one for your needs.

If you’ve recently travelled to Thailand or are planning your next visit, you’ve probably come across two official digital platforms from Thai Immigration: TDAC and THIM.

At first glance they may seem similar, but they actually serve very different purposes. Understanding the difference can save you time, prevent unnecessary confusion, and help you stay compliant with Thai immigration requirements.

In this guide, we’ll explain exactly what each platform does, compare their features, and help you decide which one is right for your situation.

What is TDAC?

TDAC (Thailand Digital Arrival Card) is Thailand’s electronic replacement for the traditional TM6 arrival card.

Instead of completing a paper form upon arrival, international travellers now submit their arrival information online before entering Thailand.

The system collects essential information such as:

Personal details
Passport information
Flight details
Accommodation in Thailand
Health declaration (when applicable)

For most foreign visitors, completing the TDAC is a mandatory step before arriving in Thailand.

Best suited for:

Tourists
Business travellers
DTV Visa holders
Retirement Visa holders
Family Visa holders
Anyone entering Thailand from overseas

What is THIM?

THIM (Thailand Immigration Mobile Application) is a digital platform developed by Thai Immigration to provide immigration-related services after you are already in Thailand.

Rather than focusing on entry into the country, THIM aims to make ongoing immigration procedures more convenient.

Depending on your visa type and the services available, the app may allow users to:

View immigration information
Access certain online immigration services
Receive notifications
Manage selected immigration-related tasks

As Thai Immigration continues expanding its digital services, THIM is expected to become increasingly useful for long-term residents.

TDAC vs THIM: What’s the Difference?

Feature	TDAC	THIM
Purpose	Digital arrival registration	Immigration services inside Thailand
When to use	Before entering Thailand	After arriving in Thailand
Mandatory?	Yes, for most international arrivals	Optional
Main users	All foreign travellers	Long-term residents and visa holders
Function	Entry declaration	Immigration management
Replaces paper form	Yes (TM6)	No

Which One is Better?

The truth is…

They are not competitors.

They serve different purposes.

If your goal is simply to enter Thailand, TDAC is essential.

If you already live in Thailand or hold a long-term visa, THIM can become a useful companion for accessing certain immigration services digitally.

Our Recommendation

At One Stop Hua Hin, we recommend thinking of the two platforms as complementary rather than alternatives.

Use TDAC if:

You’re flying into Thailand
You’re entering by land or sea where required
You’re visiting Thailand for tourism, retirement, work, education or under the DTV Visa

Use THIM if:

You already reside in Thailand
You regularly deal with Thai Immigration
You want easier access to available online immigration services
You prefer managing immigration matters digitally whenever possible

Are There Any Limitations?

Yes.

Although THIM is a promising platform, not every immigration service is currently available through the application.

Certain procedures still require:

Personal attendance at Immigration
Additional documentation
Manual verification
Appointment scheduling

Digitalisation is improving every year, but some processes remain office-based.

Which App Should You Install?

If you’re only visiting Thailand once or twice a year, TDAC is the priority because it’s directly linked to your arrival.

If you’re planning to stay longer under a Retirement Visa, DTV Visa, Marriage Visa, Business Visa or another long-term category, installing THIM is also worthwhile, as its features are likely to expand over time.

Final Thoughts

Thailand is moving steadily toward digital immigration services, making travel and visa management more efficient for international visitors and long-term residents alike.

Understanding the difference between TDAC and THIM helps you avoid unnecessary stress and ensures you’re using the right tool at the right time.

At One Stop Hua Hin, we assist clients every day with visa applications, visa extensions, retirement visas, DTV visas, driver’s licences, immigration procedures, and many other government services.

Whether you’re visiting Thailand for a short holiday or planning to make it your new home, having experienced guidance can make every step simpler.

Frequently Asked Questions

Is TDAC mandatory?

For most foreign travellers entering Thailand, yes. It replaces the old TM6 paper arrival card.

Can THIM replace TDAC?

No. TDAC is used before entering Thailand, while THIM is designed for immigration services after arrival.

Do tourists need THIM?

Not necessarily. Most short-term visitors only need TDAC.

Is THIM free?

Yes. It is an official application provided by Thai Immigration.

Can One Stop Hua Hin help with TDAC?

Absolutely. We assist clients with TDAC registration, visa applications, extensions, Retirement Visas, DTV Visas, and many other immigration services throughout Thailand.

Need assistance with your Thailand visa or immigration process?

Our experienced team is here to help you navigate every step with professional guidance, transparent advice, and personalised support.

Aon

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