Find out if your password appears in a known data breach. Only the first 5 characters of its SHA-1 hash are ever sent.
Uses Have I Been Pwned's k-anonymity API — your full password is never transmitted.
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Even a long, complex password is useless once it appears in a public data breach — credential-stuffing bots will try it against every site they can reach. This tool checks your password against the Have I Been Pwned dataset of half a billion breached passwords, using k-anonymity: only the first five characters of your password's SHA-1 hash are ever sent over the network, so the full password never leaves your device.
Type or paste the target you want to inspect into the input field at the top of the page.
Click the check button — the tool queries live data sources and returns results in seconds.
Review each finding: status, score, and the reason behind every warning are listed line by line.
Follow the linked remediation guides to fix issues, or copy the report to share with your team.
When something in your stack misbehaves, half the battle is figuring out whether the problem is you, the network, or the other side. Pwned Password Checker gives you a fast, opinionated readout so you can rule things in and out in seconds. Because the check runs on live infrastructure and reports raw results — not marketing-safe summaries — you can trust what you see and act on it. Toolzer's design philosophy is simple: privacy-first (no tracking, no accounts), performance-first (the page is interactive in under a second on a 3G connection), and honesty-first (no fake ratings, no dark patterns, no upsells). Pwned Password Checker follows the same rules as every other utility on the site. You can bookmark this page, share the URL with a colleague, or pin it to your browser's toolbar — the experience will be identical every visit, and it will keep working even if you're on airplane Wi-Fi. Real people use this tool for real work — freelancers cleaning up client deliverables, sysadmins triaging tickets, students finishing assignments — and it is tuned for those workflows, not for demo videos.
Yes. We hash your password locally with SHA-1, send only the first 5 hex characters, and compare the rest in your browser. No site (including ours) ever sees the password or its full hash.
It's how many times the password has appeared across all known breaches in the HIBP dataset. Even a single appearance means it's on attackers' wordlists.
Yes — and everywhere you've reused it. Treat each breach as confirmation the password is no longer secret.
The Pwned Passwords API was designed around SHA-1 for compatibility with leaked hash dumps. K-anonymity makes the choice of hash irrelevant to privacy.
No. Every utility on Toolzer is free, anonymous, and works in any modern browser without registration.
Yes. Whenever the tool can produce an answer entirely in the browser, the data never leaves your device.
Yes. The interface is fully responsive and works on iOS Safari, Android Chrome, and every modern mobile browser.
Yes. Every Toolzer page has a clean permanent URL you can bookmark or share.
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