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Phone Number Format

Format and validate international phone numbers. Convert any number into Э.164, international, national, and tel: URI formats, with country calling code details.

Phone Number Formatter & Validator

Enter a phone number and select the country. The tool will normalize spacing, apply the correct country calling code, and show multiple standardized formats.

Phone number

Paste any phone number with spaces, brackets, or dashes. The tool will clean and reformat it.

Улс / бүс

For local numbers without a leading +, choose the country so the correct dialling rules can be applied.

Quick examples

Formatted results

Copy the format you need for your CRM, website forms, or API integrations.

Waiting for input…

Enter a phone number above and click Format number to see the results.

Validity Not checked: Өмнөөс
Country & calling code: Өмнөөс

Өмнөөс
E.164 формат: Өмнөөс
Олон улсын зүй: Өмнөөс
Төрийн нэг форм: Өмнөөс
tel: URI (RFC3966): Өмнөөс

Tip: Use E.164 format for APIs and databases, international format for emails and invoices, and national format for local print use.

About international phone number formats

Every country has its own way of writing phone numbers, but modern systems expect a standard format so that numbers can be stored and dialled correctly across borders.

E.164 формат: the global standard for phone numbers, always written with a leading plus sign and country calling code, for example +14155552671Байна уу.
Олон улсын зүй: human-friendly, includes spaces for readability, for example +1 415 555 2671Байна уу.
Төрийн нэг форм: how the number is normally written inside the country, such as (415) 555-2671Байна уу.
tel: URI: used in HTML links and apps, for example tel:+1-415-555-2671Байна уу.

This tool uses the same numbering rules telecom operators and major cloud providers rely on, so you can safely use the output in forms, CRMs, and messaging platforms.

When to use each phone number format

Databases & APIs: use E.164 format so every record is globally unique.
Web forms: store in E.164, display back to the user in international or national format.
Email signatures & invoices: use international format so overseas contacts can dial easily.
Clickable links: хэрэглэх tel: URI so smartphones can dial with one tap.

More tools on CountryCode.Online

Phone number format FAQ

Why do websites ask for E.164 format?

E.164 guarantees that every phone number is stored in a consistent way, with a single leading plus sign and country calling code. This prevents duplicate records and makes integrations with SMS providers and VoIP platforms much easier.

Does this tool validate that a number really exists?

The validator checks whether the number is possible and follows the numbering plan for the selected country. It does not dial or confirm that a real device is online, so treat the result as a strong format check rather than a live connectivity test.

Can I use this for bulk phone number cleaning?

This page is designed for single numbers. For bulk cleaning you can still copy the logic into your own scripts using the same open-source library, or build a custom batch tool that follows your CRM rules.

Phone Number Format

Phone Number Formatter & Validator

Formatted results

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