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Why Choose .co.th for Your Thai Business
The .co.th domain is Thailand's official second-level domain for commercial entities, managed by THNIC (Thailand Network Information Center) — the organization that oversees all .th ccTLD registrations. Unlike generic TLDs like .com, .co.th is restricted to verified Thai businesses, making it a mark of legitimacy.
For businesses targeting Thai customers, .co.th delivers tangible advantages over .com in terms of trust, local SEO, and brand protection.
- Enhanced credibility: Registration requires verified business documents — customers know you are a legitimate Thai entity
- Better local SEO: Google uses ccTLD as a geo-targeting signal, giving .co.th sites an advantage in Thai search results
- Brand protection: Registering your business name under .co.th prevents competitors from using it
- Local recognition: Thai customers instinctively trust .co.th addresses for local commerce
Eligibility Requirements
Not everyone can register a .co.th domain. THNIC has strict eligibility rules to ensure these domains remain reserved for legitimate businesses.
Eligible Applicants
- Thai limited companies (บริษัทจำกัด / บจก.)
- Thai public limited companies (บมจ.)
- Limited partnerships (ห้างหุ้นส่วนจำกัด / หจก.) and registered ordinary partnerships
- Individuals with a registered commercial business name (ทะเบียนพาณิชย์)
- Foreign organizations with a registered Thai branch office
Not Eligible
- Private individuals without any business registration
- Unregistered sole traders or informal businesses
Tip: If you haven't registered a business yet but need a Thai domain immediately, use .in.th — it's available to any individual without documentation. You can add a .co.th domain once your business is registered.
Required Documents
This is the main difference between registering .co.th and .com. You must submit supporting documents proving your business exists legally.
For Companies and Partnerships
- Company Affidavit (หนังสือรับรองบริษัท): Issued by the Department of Business Development (DBD), dated within the last 6 months
- ID card copy of the authorized signatory director, with self-certification
- Memorandum of Association or shareholder list (required in some cases)
- The requested domain name must clearly relate to the company's name or stated business purpose
For Individually Registered Businesses
- Commercial Registration Certificate (ทะเบียนพาณิชย์) — dated within the last 6 months
- ID card copy with self-certification
Important: The domain name you request must correspond to your company name or business activity. THNIC will reject applications where the domain has no apparent relationship to the registered business. A food company cannot register a domain obviously related to real estate, for example.
Step-by-Step .co.th Registration Process
Choose a THNIC-Accredited Registrar
You must apply through an accredited registrar. AsiaGB.com is an experienced Thai hosting and domain provider with over 19 years in the industry.
Check Domain Availability
Use the registrar's domain search tool or THNIC's lookup to confirm your desired name is available.
Fill in Registrant Details and Pay
Enter your organization details and contact information, then complete payment. The registrar submits the request to THNIC on your behalf.
Submit Supporting Documents
Upload your company affidavit and ID copy through the registrar's portal or directly to THNIC's document portal within the specified timeframe.
Wait for THNIC Approval
THNIC verifies your documents within 1–3 business days. Once approved, your domain becomes active immediately.
Configure DNS and Point to Hosting
After approval, update your nameservers to point to your web hosting. DNS propagation takes 1–48 hours globally.
Pricing and Renewal Costs
Due to the verification process, .co.th domains are slightly more expensive than generic TLDs, but the cost is well justified by the benefits.
| Service | Price (THB) | Notes |
|---|---|---|
| New .co.th registration | 700–900 / year | Varies by registrar |
| Annual renewal | 700–900 / year | Same price each year |
| Domain transfer | 700–900 | Requires Auth/EPP Code |
| Comparison: .com | 350–500 / year | Cheaper but no Thai geo-signal |
Approval Timeline
The .co.th approval process has two phases: registrar processing and THNIC review.
| Stage | Timeframe | Key Factor |
|---|---|---|
| Submit application & pay | Immediate | Online, 24/7 |
| Submit documents | Within 24 hours | Applicant's responsiveness |
| THNIC document review | 1–3 business days | Complete docs = faster |
| Domain active / DNS propagation | 1–48 hours | Depends on ISP |
Note: THNIC does not process applications on Thai public holidays. If you apply late Friday, approval may not come until Monday. Plan at least 5–7 days ahead of your website launch date.
Comparing .co.th With Other TLDs
| Domain | Best For | Docs Required | Price/Year (THB) | Thai SEO |
|---|---|---|---|---|
| .co.th | Thai businesses, legal entities | ✅ Required | 700–900 | ⭐⭐⭐⭐⭐ |
| .th | General Thai organizations | ✅ Required | 700–900 | ⭐⭐⭐⭐⭐ |
| .in.th | Thai individuals | ❌ Not required | 350–500 | ⭐⭐⭐⭐ |
| .com | Global businesses | ❌ Not required | 350–500 | ⭐⭐⭐ |
| .net | IT/network services | ❌ Not required | 350–500 | ⭐⭐ |
Tips for Choosing a Good .co.th Domain Name
- Keep it short: Aim for under 3 words or 15 characters — easier to type and remember
- English characters only: .co.th domains require ASCII letters and numbers (no Thai script)
- Avoid hyphens: Hyphens make domains harder to remember and look spammy
- Match your brand: The domain should closely reflect your company or product name
- Check trademark conflicts: Search the Thai trademark database before registering
- Register both .co.th and .com: If budget allows, owning both protects your brand and lets you redirect traffic
SEO Tip: If your domain naturally includes a keyword people search for — like bangkokaccounting.co.th or thaisoftware.co.th — Google may interpret your site's focus faster. However, never force keywords to the point where the domain sounds unnatural.
Frequently Asked Questions
Can a sole trader with no company register .co.th?
Yes, if you have a Thai commercial registration (ทะเบียนพาณิชย์) for your business name. Without any business registration, you cannot register .co.th — use .in.th instead, which requires no documents.
Do I need to resubmit documents at renewal time?
Generally no. Renewals don't require new documents unless your company name or authorized representative has changed, in which case you must update your registrant information through your registrar.
Can I transfer my .co.th domain to another registrar?
Yes. Request an Auth/EPP Transfer Code from your current registrar and provide it to the new registrar. THNIC typically approves transfers within 3–5 business days. Your domain must have more than 60 days remaining before expiry.
Can I use Thai script in a .co.th domain?
No. .co.th supports only ASCII characters (English letters, numbers, and hyphens). For Thai-script domain names, you would need the .ไทย IDN extension — a completely separate system.
Does my hosting have to be in Thailand?
No. Your .co.th domain can point to hosting anywhere in the world. However, hosting in Thailand or Singapore reduces latency for Thai visitors, improving both user experience and Core Web Vitals scores.
What happens to my .co.th domain if I close my business?
Inform your registrar to stop renewing the domain. A lapsed .co.th domain eventually becomes available for others to register. If your brand has value, consider keeping the domain active with a redirect even after closing.
Summary: .co.th Domain Registration at a Glance
- Reserved for Thai-registered businesses and commercial entities
- Required docs: Company affidavit + authorized director's ID copy
- Process: Choose registrar → Search name → Pay → Submit docs → 1–3 day approval
- Cost: approximately 700–900 THB/year
- Key advantage over .com: Thai SEO geo-signal, local trust, brand protection
- Plan at least 5–7 days ahead of your launch date
Register Your .co.th Domain with AsiaGB
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