Tools
Password breach check.
See whether a password has appeared in a known data breach, using Have I Been Pwned's Pwned Passwords. The password never leaves your device. Need a replacement? Make one with the Passphrase Generator.
Has it been breached?
Your password never leaves this device. Your browser hashes it and sends only the first 5 characters of the hash; the check against breached passwords happens here.
Breach data comes from Have I Been Pwned, by Troy Hunt. cybun.kr passes the 5-character hash prefix on, so HIBP sees our server rather than you. We store nothing.