Invisible Prompt Injection Playground

A tool for experimenting with invisible Unicode tag characters. Use this playground to convert ASCII text to invisible Unicode tag characters and vice versa.

Convert ASCII to Unicode Tag Characters

Enter ASCII characters to convert them to Unicode tag characters:

Convert Unicode Tag Characters to ASCII

Paste a string with hidden Unicode tag characters to see them converted to ASCII and highlighted:

What is Unicode Tag Character Conversion?

Unicode tag characters (U+E0000 to U+E007F) are special invisible characters that were originally designed for language tagging in plain text. Our Invisible Prompt Injection Playground allows you to convert regular ASCII text into these invisible Unicode characters and vice versa. This tool is essential for security researchers, steganography enthusiasts, and developers experimenting with text manipulation techniques.

How to Use This Tool

Converting ASCII to Invisible Unicode Tags:

  1. Enter Your Text: Type or paste any ASCII text in the first input box
  2. Optional: Check "Prepend BEGIN Unicode Tag" to add a marker at the start
  3. Convert: Click "Convert and Copy to Clipboard" button
  4. Result: Your text is instantly converted to invisible Unicode characters and copied to clipboard
  5. Test: Paste the invisible text anywhere to verify it's truly invisible!

Revealing Hidden Unicode Tags:

  1. Paste Text: Paste text containing invisible Unicode characters in the second input box
  2. Analyze: Click "Convert and Highlight" button
  3. View Results: See the converted text with cyan highlighting for Unicode tags
  4. Statistics: Check how many Unicode tag characters were found

Why Use Invisible Unicode Characters?

  • Steganography: Hide secret messages in plain sight within normal-looking text
  • Security Research: Test how applications handle invisible characters and potential injection attacks
  • Data Watermarking: Embed invisible identifiers in text documents for tracking purposes
  • Educational Purposes: Learn about Unicode character encoding and text manipulation
  • Prompt Injection Testing: Experiment with AI prompt injection techniques in a safe environment

Frequently Asked Questions (FAQs)

Unicode tag characters are a special block of 128 invisible characters (U+E0000 to U+E007F) that were originally designed for language tagging in plain text. They are completely invisible when rendered but remain present in the text data. Each tag character maps to an ASCII character (32-126), allowing you to convert regular text into invisible form.

Yes, this tool is completely safe for educational and research purposes. All conversions happen in your browser, and no data is sent to our servers. However, use invisible characters responsibly and ethically. Do not use this tool for malicious purposes such as bypassing security filters or deceiving users. Always follow applicable laws and ethical guidelines.

This tool is designed for educational and research purposes only. While it can be used to experiment with prompt injection techniques, you should only test on systems you own or have explicit permission to test. Using this tool for unauthorized access, bypassing security measures, or attacking systems without permission is illegal and unethical. Always practice responsible disclosure.

Unicode tag characters are part of the official Unicode standard and are supported by most modern systems and applications. However, some platforms may filter or strip invisible characters for security reasons. The visibility (or invisibility) depends on the application's text rendering engine and security policies. Always test in your target environment.

Use the second section of this tool! Simply paste any suspicious text into the "Convert Unicode Tag Characters to ASCII" input box and click "Convert and Highlight". The tool will reveal all invisible Unicode tag characters by converting them to visible ASCII and highlighting them in cyan. You'll also see statistics showing exactly how many invisible characters were found.

Our tool specifically uses Unicode Tag Characters (U+E0000-E007F), which are standardized invisible characters designed for text tagging. Unlike tools that use zero-width characters or whitespace tricks, tag characters have a direct 1-to-1 mapping with ASCII characters, making conversion reversible and reliable. This makes them ideal for steganography and security research purposes.
Ethical Use Disclaimer

This tool is provided for educational, research, and legitimate security testing purposes only. Users are responsible for ensuring their use complies with all applicable laws and regulations. Do not use this tool for malicious purposes, unauthorized access, or to harm others. Always obtain proper authorization before testing security systems.