Validators
Online Validators
Validate emails, phone numbers, financial data, and more — instant results, always free.
12 validators available
All Validators
Email Validator
EmailCheck if an email address is real and deliverable — syntax, domain, and MX record checks in one click.
IBAN Checker
FinancePaste any IBAN and instantly verify its checksum, format, and bank identification — before sending a payment.
BIC / SWIFT Check
FinanceVerify a BIC or SWIFT code to confirm the bank and country before an international transfer.
Phone Number Check
PhoneValidate any phone number worldwide, identify the country and carrier, and confirm the correct format.
VAT Number Lookup
VATLook up and verify any EU VAT number against the VIES database to confirm a business is registered.
Address Checker
AddressVerify and standardize postal addresses across 240+ countries to make sure they actually exist.
URL Validator
WebParse, validate, and inspect URLs — check protocol, domain, path, and query parameters.
IP Validator
NetworkValidate IPv4 and IPv6 addresses, check ranges, subnets, and geolocation data.
Password Checker
SecurityTest password strength in real-time — entropy, common patterns, and breach database checks.
JSON/YAML/XML
DataValidate, format, and convert between JSON, YAML, and XML with instant syntax highlighting.
CSV Validator
CSVUpload a CSV file and run sequential validation checks — encoding, headers, rows, quoting, and data types.
Credit Card Validator
ValidationVerify card numbers using the Luhn algorithm and detect card type.
Why Use Online Validators?
Online validators help you verify the accuracy and correctness of data before it enters your system. Whether you're checking email addresses before a marketing campaign or validating IBANs before a payment transfer, catching errors early saves time and prevents costly mistakes.
How Our Validators Work
Each validator runs comprehensive checks specific to its data type. Email validation, for example, checks RFC 5321 syntax, domain existence via DNS, and MX record availability — going beyond simple regex checks that most tools offer.
All validation happens directly in your browser where possible, with no data stored on our servers. For checks that require external lookups (like DNS or MX records), only the necessary minimal data is sent — never your full input or personal information.
Frequently Asked Questions
Related Guides
Email Validation: The Complete Guide to Verifying Email Addresses
Learn how email validation works, why it matters, and how to check any address in seconds.
IBAN Validation: How to Verify Bank Account Numbers Instantly
Understand IBAN structure, country formats, and how to catch errors before they cause payment failures.
BIC/SWIFT Code Validation: Everything You Need to Know
BIC and SWIFT codes identify banks in international transfers. Learn how to validate them correctly.
International Phone Number Validation Made Easy
Phone number formats vary wildly by country. Discover how to validate them reliably for any region.
VAT Number Validation: Check EU Business Tax IDs in Seconds
VAT numbers follow country-specific formats. Learn to validate them and avoid costly invoice errors.
Address Validation: Ensure Accurate Postal Data Every Time
Invalid addresses cause failed deliveries and data quality issues. Learn how to validate postal data.
URL Validation: How to Check If Links Are Valid and Safe
Broken links and malformed URLs hurt user experience and SEO. Learn what makes a URL valid.
IP Address Validation: IPv4 & IPv6 Checking Explained
IP address formats differ between IPv4 and IPv6. Learn how to validate both quickly and correctly.
Password Strength Checker: Build Secure User Authentication
Weak passwords are a leading cause of breaches. Learn how to measure password strength and enforce policies.
JSON, YAML & XML Validation: Format Checking for Developers
A single typo in a config file can crash your app. Learn to validate JSON, YAML, and XML instantly.
CSV Validation: Catch Data Errors Before They Cause Problems
CSV files are simple but error-prone. Learn how to validate structure, encoding, and data integrity.
Credit Card Validator: How the Luhn Algorithm Detects Invalid Numbers
Learn how credit card validation works, including the Luhn algorithm, BIN ranges, and card type detection.