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Email Breach Checker

Free online data breach checker — find out instantly if your email address has been exposed in a known data breach. Checked against multiple live security databases. No signup, no account, completely free.

✓ Multi-source breach lookup✓ Plain-text password detection✓ No signup required✓ Free forever✓ Live databases

Your address is sent directly to independent security APIs via HTTPS — never stored or logged by us.

What this tool does

Free data breach checker — check if your email was leaked

A data breach occurs when a company's database is illegally accessed and stolen. These databases typically contain email addresses, passwords, names, and other account information collected during registration. Once stolen, this data is sold or published on criminal forums — making it searchable by anyone with the right access.

This free email breach checker queries multiple independent security databases simultaneously and merges the results. If any source returns a match, the breach details are displayed — including the type of data exposed, the number of affected accounts, and the severity of the password risk. Both XposedOrNot and HackCheck are queried in parallel so neither failure causes an incomplete result.

Knowing you are in a breach is the critical first step — it lets you change affected passwords before someone exploits the access. A clean result does not guarantee complete safety, since not every breach is indexed, but it is a strong indicator your address has not been widely exposed.

What this checker detects
📧
Email in a data breach
Check if your email address appears in any known breached database.
🔓
Plain-text passwords
Identifies breaches where passwords were stored and stolen unencrypted.
🔑
Hashed password exposure
Flags breaches where hashed passwords were leaked — still at risk if weak.
📋
Data types exposed
Shows exactly what was leaked: names, phone numbers, addresses, and more.
📅
Breach date and size
Displays when the breach occurred and how many accounts were affected.
🔍
Multi-source lookup
Cross-references multiple independent databases for comprehensive coverage.
Examples

What breach results look like -- real historical examples

These are real historical breaches. Each example shows what data was exposed and how serious the risk is.

CriticalAdobe 2013 -- 153M accounts, encrypted passwords and plain-text hints
Breach: Adobe Systems (2013) Exposed: 153,000,000 accounts Data: Email, encrypted password, password hint (plain text) Risk: HIGH -- hints revealed effective passwords for many users

Adobe stored password hints alongside encrypted passwords, letting attackers reconstruct many passwords without cracking. If your email was registered with Adobe before 2013, treat any matching password as fully compromised and change it everywhere it was reused.

CriticalLinkedIn 2012 -- 117M credentials, unsalted SHA-1 hashes
Breach: LinkedIn (2012, disclosed 2016) Exposed: 117,000,000 accounts Data: Email, unsalted SHA-1 password hash Risk: CRITICAL -- unsalted hashes cracked in bulk within hours

LinkedIn stored passwords as unsalted SHA-1 hashes, making the entire dataset crackable with rainbow tables. The breach occurred in 2012 but was not confirmed until 2016. Any LinkedIn password used before 2012 should be considered fully compromised and changed on every site where it was reused.

WarningDropbox 2012 -- 68M accounts, mixed bcrypt and SHA-1
Breach: Dropbox (2012, disclosed 2016) Exposed: 68,680,741 accounts Data: Email, bcrypt or SHA-1 hashed password Risk: MEDIUM -- bcrypt accounts protected; SHA-1 accounts at risk

Dropbox used a mix of bcrypt and SHA-1 hashing during migration. bcrypt accounts are well protected. SHA-1 accounts face much higher cracking risk. This breach illustrates why password hashing algorithm choice matters enormously for long-term security after a database theft.

CleanNo breach found -- address not in any queried dataset
Breach: None detected Sources: XposedOrNot, HackCheck, additional APIs Data: No records returned Risk: LOW -- not found in checked databases

A clean result means your address does not appear in any breach database this tool queries. New breaches are discovered continuously, so run periodic checks especially after major services you use announce incidents. Always use unique passwords per service regardless of breach status.

InfoYahoo 2013 -- 3B accounts, largest breach in history
Breach: Yahoo (2013, disclosed 2016) Exposed: 3,000,000,000 accounts Data: Email, hashed password, security question answers Risk: HIGH -- security question answers exposed

The Yahoo breach affected every account in existence at the time, making it the largest single breach ever recorded. Security question answers were also exposed alongside passwords -- a serious risk since many people reuse answers across services. Change any Yahoo-linked passwords and review security questions on other accounts.

FAQ

Frequently asked questions

Is it safe to enter my real email address here?
Yes. Your address is sent directly from your browser to independent security APIs via encrypted HTTPS. Best-TempMail never receives, stores, or logs your email address at any point in the process. Use a real email address for accurate results -- test addresses show no breaches even if the actual account is compromised. The tool uses encrypted HTTPS for all API requests and displays results only in your browser.
What does it mean if my email is found in a data breach?
It means your address — along with other data — was part of a database that was stolen and subsequently made public. It does not necessarily mean your account was directly hacked, but your details are in circulation. Change your password for that service immediately and check whether you reused it elsewhere. Enable two-factor authentication on the affected account to add a second layer of protection even if the password was compromised.
What is a data breach?
A data breach occurs when a company's database is illegally accessed and the data is stolen or leaked. These databases typically contain email addresses, passwords, names, and other account information. Once stolen, the data is sold or published on criminal forums, making it searchable by anyone. Breach checkers like this one query curated databases of known breached data. The stolen information is typically traded on dark web forums before being indexed by security researchers.
How is this different from Have I Been Pwned?
This tool queries multiple independent security databases simultaneously — including XposedOrNot and HackCheck — and merges the results. Different databases cover different breaches, so checking multiple sources gives broader coverage than any single database. The result is a consolidated view of all known breaches your address appears in. Checking across multiple sources gives broader coverage -- a breach found in one database may not appear in another, so parallel querying reduces the chance of a false clean result.
What is a plain-text password breach?
When a service stores passwords as plain text rather than hashing them, attackers get your actual password when the database is stolen. This is the most severe breach type — treat any plain-text breach as a direct compromise of that password everywhere you used it. Change that password immediately on every site where you used it. Change any plain-text breach password immediately on every site where you have used it, as attackers can test it across thousands of services within minutes of obtaining the dataset.
A clean result — am I completely safe?
A clean result means your address does not appear in any breach records we can access. However, no database covers every breach, especially very recent ones. Staying safe means using unique passwords for every account regardless of your results. New breach datasets are discovered and indexed continuously -- run periodic checks, especially after major services you use announce security incidents. Always use unique passwords per site regardless of breach status.
How current is the breach data?
This tool queries live, continuously updated security databases. New breaches are typically indexed within days of public disclosure, and historical breaches going back many years are included. High-profile breaches announced in the news are typically indexed within days. Smaller or privately discovered breaches may take longer to appear. Results always reflect the current live state of each API. Run checks periodically -- especially after major services you use announce security incidents -- since new breach data is added continuously.
What should I do if I am in multiple breaches?
Prioritise by recency and sensitivity — start with your email provider and financial accounts. Change passwords on those first, then work through the rest. A password manager ensures every account gets a unique, strong password going forward. Use a password manager to generate and store unique passwords for every account. Enable two-factor authentication everywhere it is available -- an authenticator app is more secure than SMS-based 2FA.
Can I check if my password was compromised?
This tool checks email addresses against breach databases. The breach records shown include what type of data was exposed — if a breach shows passwords were included, yours may have been among them, especially if it is listed as plain-text. To specifically check passwords, use a dedicated password breach checker that implements the k-anonymity model (like the HIBP passwords API).
Why does the tool check against multiple sources?
No single breach database has complete coverage. Different organisations discover, verify, and index breaches at different times. Checking multiple independent sources simultaneously gives the most comprehensive result possible. By querying multiple providers simultaneously, this tool maximises the chance of detecting breaches that would be missed by any single API. Results show which source confirmed each breach so you can investigate further.
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