How do I format a phone number for international calling?

To format a phone number for international calling, use the E.164 format: start with a + sign, followed by the country code, area code, and local number. For example, a US number becomes +12125551234. Our tool automatically converts any phone number to this international format.

What is the difference between E.164, International, National, and RFC3966 formats?

E.164 is the global standard (+12125551234), International adds spaces for readability (+1 212 555 1234), National uses local formatting without country code ((212) 555-1234), and RFC3966 is used for tel: links in HTML (tel:+1-212-555-1234). Use E.164 for APIs and databases, International for display, National for local audiences, RFC3966 for clickable phone links.

Can I validate phone numbers from 240+ countries?

Yes. Our phone number formatter and validator supports 240+ countries using Google's libphonenumber library — the same library used by Google, Facebook, and WhatsApp. It validates number length, area codes, and country-specific formatting rules for every country and territory worldwide.

What is the international format for a phone number?

The international format for a phone number is ITU-T E.164: +[CountryCode][Number] with no spaces or special characters, maximum 15 digits. For example, +14155550132 (US) or +447911123456 (UK). This format works universally across all phone systems, APIs, and countries.

How do I format a US phone number for international use?

To format a US phone number for international use, add +1 before the 10-digit number and remove all formatting characters. Example: (415) 555-0132 becomes +14155550132 in E.164 format. The US country code is +1, shared with Canada under the North American Numbering Plan.

What is European phone number format?

European phone numbers use the international format +[country code][number without trunk prefix]. Each country has its own code: +44 UK, +49 Germany, +33 France, +34 Spain, +39 Italy. Remove the leading 0 (trunk prefix) when dialling internationally. Example: German mobile 0151 12345678 → +4915112345678.

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Free Phone Number Formatter
& Validator

Format phone numbers online to E.164, International, National & RFC3966 — instant phone number validation powered by Google's libphonenumber. 240+ countries. No signup. No data stored.

✓ E.164 Format Converter ✓ Phone Number Validator ✓ 240+ Countries ✓ Bulk Formatter

Enter Your Phone Number

Enter phone number with country code or select country below.

Try:

Select Country (optional if using country code)

Paste Phone Numbers — One Per Line

Up to 100 numbers. Include country code or select a default country below.

Default Country (optional)

Auto-Detect Country

Identifies country from any phone number prefix automatically

One-Click Copy

Copy E.164, International, National or RFC3966 in a single click

Bulk Formatter

Format up to 100 numbers at once and download as CSV

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Format Phone Numbers
Anywhere on the Web

Select any phone number on any webpage, right-click, and instantly get E.164, International, and National formats — without switching tabs or copy-pasting. Powered by the same Google libphonenumber engine as the web tool.

Right-click any selected phone number to format it instantly
Auto-detects country from the international dialing code
One-click copy for E.164, International & National formats
100% private — all processing is local, zero data transmitted
Works on any website, supports 240+ countries

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What is a Phone Number Format?

Phone number formatting converts any local phone number format into a standardized international format — whether that's E.164, International display, National, or RFC3966 for tel: links.

Proper formatting ensures phone numbers display consistently and work correctly across different systems, platforms, and countries — for both mobile phones and landline numbers.

Without standard formatting, problems happen:

Data inconsistency in CRM systems
Failed integrations between platforms
Duplicate contact records
Click-to-dial functionality breaks
International calling fails
Landline numbers stored differently from mobile numbers

Same Number, Different Formats:

2124567890

212-456-7890

(212) 456-7890

+1 212 456 7890

+12124567890 E.164 Standard

How Our Phone Number Formatter Works

Enter Your Number

Type or paste any phone number in any format.

Include the country code if you have it, or select your country from the dropdown.

Auto-Detection

Our tool automatically detects the country code and performs real-time validation using international standards and country-specific rules — for both mobile and landline numbers.

Get All Formats

Instantly receive your phone number in international format and more: E.164, International display, National (local format), and RFC3966 (for tel: links).

Click to Copy

Click any formatted number to copy it to your clipboard.

Use it in your CRM, contact forms, or any application.

Understanding the E.164 International Standard

ITU-T E.164 numbering is the international phone number standard defined by the International Telecommunication Union (ITU) — the global authority on telecommunications.

It works seamlessly with the public switched telephone network (PSTN), all modern VoIP systems, software integrations, and auto-dialers.

E.164 Format Structure

+[Country Code][Area Code][Phone Number]

Plus Sign

Indicates international format

Country Code

1-3 digits identifying the country

212

Area Code

Regional identifier (varies by country)

4567890

Subscriber Number

The actual phone number

E.164 Rules:

Maximum 15 digits (excluding the + symbol)
No spaces, dashes, or parentheses
Always starts with +
Compatible with all international phone systems
Used by the public switched telephone network (PSTN) and all VoIP systems

Phone Number Formats by Country

Every country has its own phone number format. The table below shows the National, International, and E.164 formats for the most commonly searched countries. Use the formatter above to convert any number from these countries instantly.

Country	Code	National Format	International Format	E.164 Format
🇺🇸 United States	+1	`(415) 555-0132`	`+1 415 555 0132`	`+14155550132`
🇬🇧 United Kingdom	+44	`07400 123456`	`+44 7400 123456`	`+447400123456`
🇨🇦 Canada	+1	`(416) 555-0199`	`+1 416 555 0199`	`+14165550199`
🇦🇺 Australia	+61	`0491 570 156`	`+61 491 570 156`	`+61491570156`
🇮🇳 India	+91	`098765 43210`	`+91 98765 43210`	`+919876543210`
🇩🇪 Germany	+49	`01512 3456789`	`+49 1512 3456789`	`+4915123456789`
🇫🇷 France	+33	`06 12 34 56 78`	`+33 6 12 34 56 78`	`+33612345678`
🇪🇸 Spain	+34	`612 34 56 78`	`+34 612 34 56 78`	`+34612345678`
🇮🇹 Italy	+39	`312 345 6789`	`+39 312 345 6789`	`+393123456789`
🇧🇷 Brazil	+55	`(11) 91234-5678`	`+55 11 91234-5678`	`+5511912345678`

Formatting rules vary by country and region. Our tool uses Google's libphonenumber library to apply the correct rules for all 240+ countries automatically. Click any country above for its full format guide, or learn the standards behind each column: E.164, International, National and RFC3966 tel: links.

Who Uses a Phone Number Formatter?

Consistent phone number formatting is critical across many industries. Here's how different teams rely on standardized formats every day.

CRM & Sales Teams

Salesforce, HubSpot, and Pipedrive require consistent phone formats to prevent duplicate contacts. E.164 format eliminates mismatches like "(212) 555-1234" and "12125551234" being stored as separate records.

SMS Marketing

Twilio, MessageBird, and Vonage require E.164 format (+12125551234) for reliable SMS and voice delivery. Invalid or inconsistently formatted numbers result in failed messages and undelivered campaigns.

Developers & APIs

Back-end systems and APIs need phone numbers in a predictable format. International phone number validation — checking length, country code, and number plan — is essential before storing or dialling. Google's libphonenumber (used by this tool) is the industry standard for this in JavaScript, Python, Java, and PHP applications.

International E-commerce

Global checkout forms collect phone numbers in every national format — mobile phones and landlines alike. Formatting them to E.164 at the point of entry ensures they work correctly for order confirmations, shipping SMS, and customer support calls worldwide.

Customer Support

Click-to-dial software and VoIP systems (like RingCentral and Zoom Phone) require phone numbers in E.164 or International format. Inconsistent data means support agents can't dial customers directly from their CRM.

Data Cleaning

Imported CSV and spreadsheet data often contains phone numbers in dozens of different formats. Standardizing to E.164 removes duplicates, enables deduplication logic, and makes your contact database reliable for outreach.

Frequently Asked Questions

What is phone number formatting?

Phone number formatting is the process of converting a phone number into a standardized format that follows international or local conventions. This ensures phone numbers are displayed consistently and can be dialed correctly across different systems and platforms.

What is the E.164 phone number format?

E.164 is the international standard for phone number formatting. It uses the format: +[country code][area code][phone number] with no spaces or special characters. For example: +14155551234. This format ensures compatibility with virtually all phone systems worldwide.

Why should I use a phone number formatter?

Using a phone number formatter ensures consistency, prevents data entry errors, improves CRM integration, enables click-to-dial functionality, and ensures international compatibility. It helps avoid issues with duplicate records and broken integrations between platforms.

Do I need to include the country code?

For best results, include the country code (e.g., +1 for US/Canada). If you don't have it, select your country from the dropdown menu. This helps our tool accurately format your number according to that country's specific rules.

What formats does this tool support?

Our formatter provides four key formats: E.164 (international standard), International (with spaces for readability), National (local format), and RFC3966 (for tel: links in HTML). Each format serves different purposes and use cases.

Is my data stored or shared?

No. All phone number formatting happens entirely in your browser using client-side JavaScript. We don't store, transmit, or share any phone numbers you enter. Your data remains completely private.

Can I use this for bulk phone number formatting?

This tool is designed for individual phone number formatting. For bulk operations, you'd need a specialized tool or API integration. However, you can quickly format multiple numbers one at a time using our fast, one-click copy functionality.

Which countries are supported?

Our tool supports phone numbers from all countries worldwide using the libphonenumber library, which is maintained by Google and includes formatting rules for every country. Simply select your country or let our auto-detection identify it from the number.

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