LeakCheck

LeakCheck is a lightweight Windows security utility designed to help users find out whether their passwords or email addresses have appeared in known data breaches.



It checks passwords against the Have I Been Pwned database using a k-anonymity method, so passwords are not transmitted in plain text, and it can also scan email addresses against millions of compromised accounts.

ASCOMP positions it as a privacy-conscious tool that works directly on the PC, with local encrypted storage for saved data.

The FileHorse review team would recommend LeakCheck to Windows users who want a simple way to audit exposed credentials without dealing with a complex enterprise security suite.



Key Features

Password breach check: Compares passwords against millions of known leaked credentials.

Email breach check: Scans email addresses for appearances in known account leaks.

k-anonymity protection: Uses anonymized hash fragments instead of sending plain-text passwords.

Local encrypted storage: Saves passwords and email addresses locally using Windows DPAPI protection.

Dashboard overview: Separates safe and compromised entries for a quick status check.

Automatic monitoring: Professional Edition can monitor in the background and alert on new breaches.

Breach details view: Shows the name, title, and date of each detected breach.

Browser import: Includes an import function for bringing in saved credentials more easily.

User Interface

It has a clean and practical interface that looks built for clarity rather than flashy presentation.

The dashboard is the main highlight, giving users an immediate summary of safe and compromised passwords or email accounts, plus the total number of detected breaches.



Separate screens for password lists, email lists, manual entry, browser import, and monitoring keep navigation straightforward.

This makes the app approachable even for users who are not deeply technical. Based on the official screenshots and feature layout, the program appears focused on fast visibility and simple action steps.

Installation and Setup

Installing LeakCheck on PC should be quick because the software has a small footprint and modest hardware requirements.

After downloading the installer, users can complete setup in a few clicks, launch the app, and begin adding passwords or email addresses for checking.

Since the software stores data locally and encrypts it with Windows Data Protection API, setup feels more privacy-oriented than many cloud-first monitoring tools.



The Standard edition is FREE for personal use and evaluation, while the Professional edition unlocks background monitoring and commercial use.

How to Use

1. Download LeakCheck from the official ASCOMP website or FileHorse and install it on your Windows PC.
2. Open the application and review the main dashboard.
3. Add passwords manually or import stored credentials from a browser-supported source.
4. Run a password check to see whether any password appears in known data breaches.
5. Add one or more email addresses to the monitoring list.
6. Run the email scan and review the breach name, title, and date for affected entries.
7. Change compromised passwords on affected services and enable 2FA where possible.
8. Use Professional Edition if you want automatic recurring monitoring and alerts for newly detected leaks.

FAQs

What does it mean if LeakCheck finds one of my passwords in a breach?
It means that password has appeared in a known public breach dataset and should be changed immediately on every service where it is used.

Does LeakCheck send my password in plain text online?
No. It uses a k-anonymity method with anonymized hash fragments, not plain-text transmission.

What is the benefit of the Professional Edition?
It adds automatic monitoring for passwords and email addresses and also allows business or commercial use.

Are email checks limited?
Yes. The Standard edition allows 3 requests per minute and up to 15 per day, while Professional allows 10 per minute and up to 50 per day. Password checks are not limited.

Where is my stored data kept?
Passwords and email addresses are stored locally on the PC and encrypted using Windows DPAPI.

Pricing

LeakCheck Standard is FREE for personal use and evaluation.

The Professional Edition costs 19.90 EUR.

Registered Professional users receive program updates and technical support for 24 months from purchase.



System Requirements

Processor: Intel compatible or Windows on ARM.

Memory: 2 GB minimum, 4 GB recommended.

Hard Disk: 50 MB.

Operating Systems: Windows 11, 10, 8.1, 8, 7, and Windows Server 2012 through 2025 editions listed by ASCOMP.

PROS

• Strong privacy approach with k-anonymity.
• Local encrypted storage is reassuring.
• Very easy to understand and use.
• Free version available for personal use.
• Fast password breach checking.
• Useful breach details for email results.
• Professional version is affordable.

CONS

• Email checks have daily request limits.
• Best monitoring features are locked behind Pro.

Conclusion

LeakCheck is a focused and user-friendly Windows tool for anyone who wants to check passwords and email addresses against known breaches without sacrificing privacy.

It is not a full identity protection suite, but for local credential checking and simple monitoring, it delivers very good value and a clean experience.