Thai Phone Number Formatter

Turn messy Thai phone numbers into clean, standard formats in one step. Paste a number written any way — with +66, a leading zero, spaces or dashes — and get the national format, the international E.164 form and the plain 66 digits that LINE and WhatsApp expect. The tool detects mobile, Bangkok and provincial landline, and toll-free numbers, and flags anything invalid. Need a whole contact list cleaned? Switch to bulk mode and export every result as CSV. Everything runs in your browser.

Phone number

Type a number in any format — spaces, dashes, a +66 prefix or a leading 0 all work.

Formatted number appears here

Enter a Thai phone number to normalize it into national, international and messaging formats.

Results appear here

Paste a list of phone numbers to normalize them all at once.

Total

Valid

Invalid

Normalized numbers

#	Input	National	International	Type	Status

How to use

Paste or type a Thai phone number in any format — +66, a leading 0, spaces and dashes are all fine.
See it validated and labelled as mobile, landline or toll-free, with the area code for landlines.
Copy the national, international (+66 / E.164) or LINE / WhatsApp format you need.
For a list, open the Bulk tab and paste one number per line to normalize them all at once.
Click Export CSV to download every cleaned number for your CRM or spreadsheet.

Features

Detects mobile (06/08/09), Bangkok (02) and provincial landlines, and toll-free 1800 numbers
Normalizes +66, 66 and leading-0 prefixes into one consistent format
Three ready-to-copy outputs: national, international E.164 and messaging (66) form
Bulk mode normalizes an entire list and exports it as CSV
Clear valid / invalid flag so bad numbers never reach your database
100% in-browser — numbers are never uploaded or stored

Frequently asked questions

How do I write a Thai mobile number in international format?

Drop the leading 0 and add the +66 country code. So 081 234 5678 becomes +66 81 234 5678, or +66812345678 in strict E.164. For LINE, WhatsApp and many APIs, use the same digits without the plus: 66812345678. This tool produces all three at once.

What is the difference between the +66 and 66 formats?

They are the same digits. +66 is the full E.164 international form used for dialling and most databases; 66 without the plus is what messaging apps like LINE and WhatsApp — and some SMS gateways — expect. Removing the leading 0 and prefixing 66 gives you the messaging form.

How many digits should a valid Thai number have?

Mobile numbers have 10 digits and start with 06, 08 or 09. Landlines have 9 digits: a Bangkok number starts with 02, and provincial numbers start with a three-digit area code such as 032, 044 or 053. Toll-free service numbers use the 1800 prefix.

Can it format landline and Bangkok numbers too?

Yes. Bangkok numbers are grouped as 02-XXX-XXXX and provincial landlines as 0XX-XXX-XXX, while mobiles use 0XX-XXX-XXXX. The tool picks the correct grouping automatically from the number type and shows the area code for landlines.

Are my phone numbers sent to a server?

No. All parsing, validation and formatting happen in JavaScript in your browser, including the bulk list and CSV export. Nothing you enter is uploaded, logged or stored, so it is safe to use with real customer contact lists.

Thai Phone Number Formatter

Normalized numbers

How to use

Features

Frequently asked questions

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