E.164 Phone Number Validator
BetaThis tool is in beta. Some features may change or have limited functionality.Validate and convert phone numbers to E.164 international format. Check compliance with ITU-T E.164 standard, view country codes, national numbers, and export in multiple formats. Supports batch validation.
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E.164 Format Reference
+[country code][subscriber number]max 15 digits total
E.164 Format Rules
Plus Sign Required
Must start with + followed by the country code. No exceptions.
No Formatting
No spaces, dashes, parentheses, or dots. Digits only after the +.
Max 15 Digits
Total number of digits (country code + subscriber number) cannot exceed 15.
Country Code First
The country code (1-3 digits) immediately follows the +. No trunk prefix (0).
Why Use E.164 Validator?
E.164 is the international telephone numbering standard defined by ITU-T. It's the required format for SMS APIs (Twilio, Vonage), VoIP systems, and databases storing phone numbers globally. A valid E.164 number starts with +, followed by a country code and subscriber number, with a maximum of 15 digits total.
This validator checks if phone numbers comply with the E.164 standard, converts local numbers to E.164 format, and provides multiple output formats. Use batch mode to validate entire lists of phone numbers at once — perfect for cleaning up CRM data, validating API inputs, or preparing bulk SMS campaigns.
Frequently Asked Questions
What is E.164 format?
E.164 is the international standard for phone number formatting defined by ITU-T (International Telecommunication Union). Numbers must start with a plus sign (+), followed by a country code (1-3 digits) and subscriber number, totaling no more than 15 digits. Example: +14155552671 for a US number.
Why is E.164 important for developers?
E.164 is the required format for major APIs like Twilio, Amazon SNS, Google Cloud, and Vonage. Storing phone numbers in E.164 ensures they work globally without ambiguity. It eliminates formatting variations like (415) 555-2671 vs 415-555-2671 vs 4155552671.
How do I convert a local number to E.164?
Select the country from the dropdown and enter the local number. The tool automatically adds the country code and removes any local trunk prefix (like the leading 0 used in many countries). The E.164 output is shown in the results.
Can I validate multiple phone numbers at once?
Yes. Switch to Batch Validation mode, paste one phone number per line, and click Validate All. The tool validates each number and shows which are valid E.164. You can copy all valid results with one click.
Is this tool free and private?
Yes. This tool is completely free with no signup required. All validation happens in your browser — no phone numbers are sent to any server. Your data stays on your device.