Crypto
Homoglyph / IDN Checker
Detect homograph attacks — domains with lookalike Unicode (Cyrillic/Greek vs Latin). Phishing prevention.
100% client-side. Checks Cyrillic/Greek characters that look like Latin. Not exhaustive.
How to use
- Enter a domain, URL, or value relevant to Homoglyph / IDN Checker.
- Run the check and review the output carefully.
- Apply recommended fixes, then run the check again to verify.
Common use cases
- Pre-deployment validation for Homoglyph / IDN Checker.
- Incident triage when security checks fail in production.
- Periodic security review as part of technical SEO and hardening.
Example inputs
google.comаpple.comрaypal.comCommon issues and fixes
Homograph attack
Attackers use Cyrillic а instead of Latin a. Users see 'google' but visit a fake site.
Mixed scripts
Legitimate IDN uses one script. Mixed Latin+Cyrillic is suspicious.
Recommended remediation
Check domains before clicking. Use Punycode (xn--) form. Browsers may show Punycode for mixed-script domains.
FAQ
Is Homoglyph / IDN Checker free to use?
Yes. This tool is free and can be used without account registration.
Do you store submitted values?
Only the minimum processing needed for the check. For client-side tools, data stays in your browser.
How should I use these results?
Use the output as a diagnostic baseline, apply fixes in your stack, then re-run the check to confirm remediation.