--- title: "Phone Number Validator" description: "Validate one phone number or a whole list. Get E.164, international and national formats, the number type and the country, right in your browser." url: https://findutils.com/security/phone-number-validator/ category: security --- # Phone Number Validator Validate one phone number or a whole list. Get E.164, international and national formats, the number type and the country, right in your browser. **Use this tool:** [Phone Number Validator](https://findutils.com/security/phone-number-validator/) ## Programmatic access - REST id `phone-format`: POST https://api.findutils.com/api/tools/phone-format/execute (reference: https://findutils.com/api/phone-format/) - MCP tool `phone_format` on https://mcp.findutils.com (reference: https://findutils.com/mcp/phone-format/) ## Why use Phone Number Validator? Check phone numbers before you store them or send an SMS. The Single tab validates one number against its country's numbering plan, detects the number type (mobile, fixed line, VoIP, toll-free) and gives you E.164, international, national and Tel URI formats. The Batch tab takes a list, one number per line, and returns each number in E.164 with its country, so you can copy every valid number in one click. ## Tips for Phone Number Validation - Store phone numbers in E.164 format (+ followed by the country code and number) so they work with APIs and across regions. - Include the country code when validating numbers from international users, or set the default country, so national formats are not read with the wrong country's rules. - Use the phone type to route messages: SMS to mobile numbers, voice calls to fixed lines. - Validation checks numbering-plan rules, not whether a number is in service. Use a carrier lookup service when you need to know that a line is active. - E.164 never includes the trunk prefix, such as the leading 0 used in many countries. Select the country and the tool drops it for you. ## Frequently Asked Questions ### What is E.164 format? E.164 is the ITU-T standard for international phone numbers: a plus sign, the country calling code (1 to 3 digits), then the subscriber number, with no spaces or punctuation and at most 15 digits in total. Example: +14155552671. Most SMS and voice APIs expect numbers in this format. ### How accurate is the validation? The validator checks number length, prefixes and format rules for each country using libphonenumber-js. It tells you whether a number fits the country's numbering plan, but it cannot tell whether the number is in service or assigned to someone. ### Can I validate a list of phone numbers at once? Yes. Open the Batch tab, choose a default country, paste one number per line and select Validate All. The table shows each number's E.164 form, whether it is valid and its country, and Copy All Valid E.164 copies only the valid numbers, one per line. ### How do I convert a local number to E.164? Select the country from the dropdown and enter the number as you would dial it locally. The tool adds the country code and drops the trunk prefix, such as the leading 0 used in many countries, and shows the E.164 result. A number that already starts with + is matched to its own country. ### What phone types can be detected? For valid numbers the tool reports the type: mobile, fixed line, fixed line or mobile, toll-free, premium rate, shared cost, VoIP, personal number, pager, UAN or voicemail. Detection is based on the number ranges defined for each country; where a country does not separate the ranges, the type shows as fixed line or mobile. ### What does 'Possibly Valid' mean? A 'Possibly Valid' result means the number has a plausible length for the country, but it does not match a range the numbering plan marks as valid. It may be unassigned or mistyped, so check it before relying on it. ### What is the difference between E.164 and international format? E.164 is the compact machine form with no spaces or dashes, for example +14155552671. International format adds spacing for people to read, for example +1 415 555 2671, following the ITU-T E.123 display conventions. Store E.164, and show the international format. ### Does E.164 include extensions? No. E.164 covers only the dialable number: a plus sign followed by digits. Extensions, pauses and tone sequences are not part of it, so keep an extension in a separate field next to the E.164 number. ### Is this tool free and private? Yes. It is free, needs no signup, and validation runs in your browser with libphonenumber-js, so the numbers you type or paste are not uploaded. ### Is there an API for phone number formatting? Yes. The REST endpoint phone-format and the MCP tool phone_format validate a number and return it in E.164, international and national form with its country. They use the same libphonenumber-js metadata as this page, so a number gets the same valid or invalid answer in both places. Give the country as an ISO code (such as GB) or a calling code (such as 44) for numbers without a +. The API does not report the number type (mobile, fixed line); the Single tab does. An API call sends the number to FindUtils over TLS; it is not stored or logged. ## Related Tools - [Email Validator](https://findutils.com/security/email-validator/) - [Regex Tester](https://findutils.com/developers/regex-tester/) - [Data Sanitizer](https://findutils.com/security/data-sanitizer/) - [DNS Lookup](https://findutils.com/network/dns-lookup/) - [Email Security Checker](https://findutils.com/security/email-security-checker/) - [Password Pattern Validator](https://findutils.com/security/password-pattern-validator/) - [UUID Generator](https://findutils.com/generate/uuid-generator/) - [JSON Schema Validator](https://findutils.com/developers/json-schema-validator/)