Credential Stuffing Risk
A new tool extracted from the codebase.
Last reviewed by the Radiatus Cloud team
Need this done properly for your business?
Radiatus delivers secure cloud, DevOps & compliance engineering.
Assess your exposure to credential stuffing
Credential stuffing is when attackers try username and password pairs leaked from other breaches against your login, and assessing your exposure helps you defend. This tool helps you assess credential-stuffing risk so you can harden your own authentication.
Why credential stuffing works
Because people reuse passwords across sites, a pair leaked from one breach often works on another, and attackers automate trying millions of leaked pairs against login pages. Any login without defences is exposed. The risk depends on factors like whether you enforce multi-factor authentication, rate-limit login attempts, and screen against known-breached passwords, which together determine how well you resist an automated campaign.
The defences that stop it
The effective defences are multi-factor authentication, which makes a stolen password insufficient, rate limiting and bot detection to blunt automation, and screening passwords against breach lists so reused ones are rejected. Assessing where you stand on these shows what to strengthen. This is for defensive assessment and education around systems you own or protect, or for authorised security testing and awareness, not for targeting others. It runs entirely in your browser, so nothing you enter is uploaded, which matters when the input concerns your own security posture.
Related tools
- User Agent Parser — Parse a User-Agent string into browser, engine, operating system and device. Explains why UA strings are unreliable and what to use instead.
- QR Code Generator — Generate QR codes for URLs, text, Wi-Fi and contact details. Adjustable error correction and size, produced entirely in your browser.
- Credit Card Validator — Validate a card number with the Luhn algorithm and identify the issuing network from its prefix. Runs locally, nothing is transmitted.
- Text Case Converter — Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case and sentence case. Runs entirely in your browser.
Frequently Asked Questions
What is credential stuffing?
An attack that tries username and password pairs leaked from other breaches against your login, exploiting the fact that people reuse passwords.
How do I defend against it?
Enforce multi-factor authentication, rate-limit and bot-detect login attempts, and screen passwords against known-breached lists so reused ones are rejected.
Why is MFA the strongest defence?
Because it makes a stolen password insufficient on its own, so even a valid leaked password does not grant access without the second factor.
Is this for my own systems?
Yes. It is defensive assessment to harden authentication you own or protect against automated credential-stuffing campaigns.
Is my input uploaded?
No. It runs entirely in your browser.
Privacy & Security
Processed locally.
About This Tool
This tool runs entirely in your browser. No data is sent to any server, ensuring complete privacy. Simply use the interface above to get started — no registration or login required.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
Related Tools
User Agent Parser
UtilityParse a User-Agent string into browser, engine, operating system and device. Explains why UA strings are unreliable and what to use instead.
QR Code Generator
UtilityGenerate QR codes for URLs, text, Wi-Fi and contact details. Adjustable error correction and size, produced entirely in your browser.
Credit Card Validator
UtilityValidate a card number with the Luhn algorithm and identify the issuing network from its prefix. Runs locally, nothing is transmitted.