Local, fast and private
Hashing, UUID generation and validation all happen in your browser, so passwords and data never leave your device. Each tool follows the relevant standard, such as RFC 9562 for UUIDs and RFC 9309 for robots.txt.
6 free tools
Developer & Security Tools
Everyday developer and security utilities that run locally in your browser: UUIDs, subnets, hashing, ciphers and robots.txt checks.
Caesar Cipher Decoder
Decode or encode any Caesar shift, with all 25 shifts ranked by English fit.
UUID Generator
Random v4 or time-ordered v7 UUIDs in bulk, with a built-in validator.
Morse Code Decoder
Text to Morse and back, with audio playback and a flashing light.
IP Subnet Calculator
Network, broadcast, host range, mask and subnet splits for any IPv4 CIDR.
Bcrypt Generator
Hash a password with bcrypt at any cost, or verify a password against a hash.
Robots.txt Validator
Find robots.txt errors and test any URL against Google's matching rules.