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Password Leak Check / Check many passwords for leaks at once

Check many passwords for leaks at once

Paste a list, one password per line. Each password is hashed in your browser and checked with k-anonymity. Results are masked so you can share a screenshot safely.

What leaves your browser: only the first 5 characters of the SHA-1 hash. Never the password.

Who this is for

IT admins rolling out a password manager, teams cleaning up shared accounts, or anyone moving old passwords from a spreadsheet or browser export. Find the leaked ones first and replace those.

Tip: a password manager's own security report (Bitwarden, 1Password, Apple Passwords, Chrome Password Checkup) does the same check across your whole vault automatically. This page is for the lists that live outside one.

Frequently asked questions

Is the list uploaded?

No. Every password is hashed with SHA-1 in your browser and only the first 5 hash characters of each are sent. The list itself stays in your browser tab.

Why only 50?

To keep the public API fair for everyone. Reload and paste the next 50 if you need more.

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