Use cases for E.164 normalization
Use E.164 normalization before bulk phone validation, API submissions, CRM imports, SMS sending, WhatsApp filtering, and global phone list cleaning.
The per-country digit counts and trunk prefixes that normalisation depends on are tabulated for 50 countries in the phone number format reference, with a CSV of the same rows.
When format is not enough
A correctly formatted number can still be invalid, unreachable, fixed line, VoIP, or wrong for your campaign. Pair format checks with Validate International Phone Numbers, line type detection, Phone Validation API, and UK Phone Number Checker for deeper validation.
Security and limits
Formatting validates shape, not ownership. Do not use format checks as identity proof. Review Security and Privacy Policy for data handling.
FAQ
What is E.164 format?
E.164 is an international phone number format with a plus sign, country code, and national number, such as +16175550298.
Can I normalize a whole CSV?
Yes. Use Phone List Cleaning to normalize and validate phone numbers in bulk.