Spoof Unicode Text

Replace ASCII characters with visually identical Unicode homoglyphs from Cyrillic and Greek scripts. For security research, testing spam filters, and detecting IDN homograph attacks.

Private • In-browser processing • Zero server uploads

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How to Use Spoof Unicode Text

1
Enter Text
Type or paste the text, domain, or identifier you want to test with homoglyphs.
2
Adjust Substitution
Choose your desired percentage of character substitution using the slider.
3
Inspect & Restore
Copy the visually identical string, or switch the mode to 'Restore' to revert homoglyphs back to clean ASCII.

Key Features

Authentic Homoglyphs
Substitutes Latin characters with identical glyphs from Cyrillic, Greek, and extended Unicode blocks.
Adjustable Intensity
Control the exact percentage of candidate characters replaced (10% to 100%).
Bidirectional Restorer
Includes a 1-click restore mode to normalize homoglyphs back to standard ASCII.
Ethical Testing Tool
Designed for defensive security testing, spam detection, and educational demonstrations.

Common Use Cases

  • Testing Internationalized Domain Name (IDN) homograph defenses in web browsers and email clients.
  • Auditing phishing detection filters and brand spoofing monitoring tools.
  • Educational demonstrations of character set encodings and confusables in cybersecurity courses.
  • Evaluating anti-spam tokenizers and text normalization algorithms.

Frequently Asked Questions

An IDN homograph attack occurs when an attacker registers a domain name using visually identical foreign characters (such as Cyrillic 'а' instead of Latin 'a') to trick users into visiting a fake website.

Yes! Switch the Action selector to 'Restore', and the tool will map all Cyrillic and Greek look-alike characters back to standard Latin ASCII.

Yes. This tool runs entirely client-side in your browser for testing, security audits, and educational research only.

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