Have I Been Pwned vs Mozilla Monitor: which breach checker to use

Have I Been Pwned and Mozilla Monitor both tell you when your email address appears in a data breach. Both are free for individuals, and they share more than most comparisons admit.

This guide compares them feature by feature, explains what changed recently, and helps you choose the one that fits how you work.

The short answer

Use Have I Been Pwned for a quick search without an account, to check passwords or to monitor a domain you own. Use Mozilla Monitor for a guided dashboard that tracks several addresses and your progress fixing each breach.

Because Monitor uses Have I Been Pwned's data, you do not need both to get the same coverage.

At a glance

Feature	Have I Been Pwned	Mozilla Monitor
Cost	Free for individuals. Domain monitoring is free up to 10 breached addresses, then normally needs a subscription.	Free.
Account needed	No account to search. Alerts need you to confirm your address.	A free Mozilla account.
Addresses monitored	Add each address to Notify me and confirm it.	Up to 20 email addresses.
Breach data	Its own breach database.	Breach data from Have I Been Pwned.
Help fixing breaches	Describes each breach and the data it exposed.	Gives step-by-step fixes and remembers which ones you finished.
Password checking	Pwned Passwords service.	Not offered as a separate check.
Domain monitoring	Yes, after you prove you control the domain. Free up to 10 breached addresses; larger domains normally need a subscription.	No.
Data broker removal	No.	No. Monitor Plus closed on December 17, 2025.

They use the same breach data

Mozilla Monitor began in 2018 as Firefox Monitor and gets its breach information from Have I Been Pwned. A breach that appears in one will normally appear in the other.

Results may differ in some cases, so the real choice is between a quick search and a guided dashboard.

That changes the question. You are not choosing whose data is better, but which experience suits you: a fast search tool, or a dashboard that guides you through fixes.

Searching without an account

Have I Been Pwned lets anyone search an email address instantly, with no account and no sign-up. The results list each breach, when it happened and the types of data exposed.

Mozilla Monitor asks you to sign in with a free Mozilla account first. That takes longer, but it means your results and progress are saved for next time.

Monitoring several addresses

Many people have several addresses: personal, work, old accounts. Both services can watch all of them, but they handle it differently.

If you manage addresses for family members, Monitor's single dashboard is easier to keep on top of.

Help fixing what was exposed

Finding a breach is only the start. What you do next matters more.

Have I Been Pwned describes each breach and lists the data exposed, then leaves the next steps to you. Mozilla Monitor turns each breach into a set of recommended steps and remembers which ones you have completed.

If breach lists leave you unsure what to do, Monitor's guidance is the clearer starting point. Our guide to checking whether your email was in a data breach covers the steps either way.

Already caught up in a breach? Start with our guide to what to do after a data breach.

Changing the password matters more than the tool you pick, and our guide to changing passwords after a breach explains which ones need it.

Checking passwords

Have I Been Pwned also runs Pwned Passwords, a separate service that tells you whether a given password has shown up in a breach. Many password managers use it to warn about leaked passwords.

Mozilla Monitor focuses on email addresses. Mozilla's page on Firefox breach alerts explains that the password manager built into Firefox can warn you about saved logins for breached sites.

Monitoring a company domain

If you run a business or a personal domain, Have I Been Pwned can show every address on that domain that appears in a breach.

You must prove you control the domain first.

Have I Been Pwned's pricing page says domains with up to 10 breached addresses can be monitored free, and larger domains need a subscription matched to their size.

Have I Been Pwned's FAQ adds that breaches flagged subscription-free can be searched without a subscription, whatever the size of the domain.

Domain search shows which addresses were affected and in which breaches. It does not show the leaked passwords or full records. Mozilla Monitor has no equivalent feature.

What changed recently

Mozilla launched a paid tier, Monitor Plus, in 2024 to scan data broker sites and request removals. Mozilla's own notice says it shut the service down on December 17, 2025 and permanently deleted the scan and removal data.

If you want to remove your details from data broker sites yourself, our guide to opting out of data brokers walks through the steps.

Paid removal services are a different trade-off. Our guide to whether data removal services work explains what independent tests found.

The free service carried on and now watches up to 20 email addresses. Comparisons written before the shutdown that recommend Monitor for data broker removal are out of date.

Privacy and deleting your data

Both services handle information linked to your email address. Deleting your monitoring data is different from removing exposed information from the internet, which neither service can do.

Which one should you use?

Using both does no harm, but it adds duplicate alerts without new coverage. Most people are better served by picking one and acting on what it finds.

Frequently asked questions

Is Mozilla Monitor the same as Have I Been Pwned?

No, but they are closely linked. Monitor uses Have I Been Pwned's breach data and adds a guided dashboard on top.

Is Have I Been Pwned free?

Searching and alerts for individual email addresses are free. Domain monitoring is free for domains with up to 10 breached addresses, and larger domains normally need a subscription.

Is Mozilla Monitor still free?

Yes. Its free breach monitoring carries on and can watch up to 20 addresses. Only the paid Monitor Plus tier closed.

Does Mozilla Monitor still remove data from data brokers?

No. Monitor Plus, which handled data broker removals, closed on December 17, 2025.

Which one finds more breaches?

Usually neither. Because Monitor uses Have I Been Pwned's data, both normally show the same breaches for an address.

Can these tools remove my data from a breach?

No. Neither service can undo the original breach or guarantee that every copy of exposed data disappears. They show what was exposed, so you can secure accounts, change compromised passwords and reduce the risk of misuse.

Up nextWhat to do after a data breach: the first 24 hoursFound a breach? Our guide to what to do after a data breach walks through the first 24 hours, from securing the account to protecting your credit.→