Enter Phone Number
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Try These Examples
How to Validate a Phone Number
- 1
Select the Country
Choose the country from the dropdown menu. The validator uses country-specific dialing rules, prefix patterns, and number length requirements to check each number accurately. - 2
Enter the Phone Number
Type the phone number in the input field. You can enter it with or without the country code, with spaces, dashes, or parentheses. The tool strips formatting characters automatically. - 3
Review the Validation Result
The tool instantly shows whether the number is valid, invalid, or possibly valid. It also detects the phone type such as mobile, fixed line, VoIP, or toll-free. - 4
Copy the Formatted Output
Choose from E.164, international, national, or Tel URI format. E.164 is the standard for APIs and databases, while the national format is best for local display.
Common Use Cases
Form Input Validation
Database Cleanup and Normalization
International SMS and Voice Campaigns
CRM Data Quality Auditing
Why use Phone Number Validator?
Phone Number Validator is a free browser-based tool that checks whether a phone number is valid for a given country and converts it into standardized formats. It uses the same libphonenumber library that powers phone validation in Google products, applying country-specific rules for number length, prefix patterns, and regional formatting. No data leaves your browser during validation.
The tool supports over 200 countries and territories, detecting the phone type (mobile, fixed line, VoIP, toll-free, premium rate) and outputting numbers in E.164, international, national, and Tel URI formats. E.164 is the format required by most telephony APIs including Twilio, AWS SNS, and Vonage. Developers building signup flows can pair this tool with the Email Validator to verify both contact fields, or use the Regex Tester to build custom validation patterns for specific number formats.
For teams handling international customer data, consistent phone formatting prevents duplicate records and failed message deliveries. Use this tool alongside the Data Sanitizer to clean bulk datasets, or check domain-level contact info with the DNS Lookup tool. All processing happens client-side with no server uploads, making it safe for sensitive contact information.
How It Compares
Online phone validators fall into two categories: format validators that check structure and carrier lookup services that verify whether a number is active. This tool is a format validator, using Google's libphonenumber to check against official numbering plans for each country. It is completely free with no API key, no rate limits, and no data uploaded to a server. Paid carrier lookup services like NumVerify and Abstract API charge per request and require account signup, but they can confirm whether a number is currently active and identify the carrier.
Compared to other free validators, most web-based alternatives send your input to their servers for processing. This tool runs entirely in the browser, so phone numbers never leave your device. For developers who need programmatic validation, the same libphonenumber library is available as an npm package, but this tool provides instant results without any setup.