Validators
Validate Base64 strings and check the syntax of email addresses, URLs, IPv4/IPv6 addresses and card numbers. 5 tools, each running privately in your browser — nothing is ever uploaded.
Validators 5
Base64 Validator
ValidatorsCheck characters, padding, length, and data URI format with clear results.
Launch toolEmail Syntax Validator
ValidatorsCheck the syntax of email address lists locally. Find invalid entries and duplicates, then export clean lists.
Launch toolURL Validator
ValidatorsCheck the syntax of URLs in bulk — protocol, host, port, path, query and percent-encoding. Nothing is fetched.
Launch toolIP Address Validator
ValidatorsValidate IPv4, IPv6 and CIDR in bulk and see if each address is public, private, loopback or reserved.
Launch toolCredit Card Number Validator
ValidatorsCheck card-number syntax locally with the Luhn checksum and likely network. Results are masked.
Launch toolEvery tool is local-first
There is no upload step and no server processing. Each tool uses native browser APIs, so your files and text never leave your device.