Text Steganography
Hide secret messages inside normal text using invisible characters
Text Steganography - Hide Messages in Text Online
Text steganography allows you to embed secret messages within ordinary text using invisible zero-width Unicode characters. The resulting text looks completely normal but contains a hidden message.
To hide a message, enter your normal-looking cover text in the first field and your secret message in the second. Click encode, and the tool embeds your secret into the cover text using zero-width Unicode characters (ZWSP, ZWJ, ZWNJ) that are invisible but preserved when the text is copied. The resulting text looks identical to the original but contains hidden data. To reveal a message, paste text that you suspect contains hidden content and click decode. If steganographic data is present, the secret message will be extracted and displayed. All encoding and decoding happens in your browser using Unicode character manipulation.
Privacy activists share sensitive information in plain sight by embedding coordinates or contact details in public messages. Social media users watermark their original content with hidden authorship tags to prove ownership if reposted. Journalists hide source identifiers in published articles as insurance against leaked documents. Developers embed metadata or copyright info in code comments using invisible characters. Whistleblowers communicate through seemingly innocuous messages on monitored platforms. Students hide cheat sheets in allowed materials using invisible text for exams (though we don't recommend this).
The hidden message is fragile—some platforms and text editors strip zero-width characters, destroying the steganography. Test your target platform by encoding and decoding a test message first. Longer cover text can hide longer secrets with better concealment. Don't rely on this for high-security communications—sophisticated analysis can detect unusual character patterns. Copy-paste the encoded text rather than retyping it to preserve the invisible characters. For maximum compatibility, keep cover text to simple ASCII or common Unicode characters.
All processing happens directly in your browser. Your files never leave your device — no server uploads, no cloud storage, no data retention. The tool works offline once loaded, requires no registration, and is completely free with no usage limits.
Frequently Asked Questions
What is text steganography?
Text steganography is the practice of hiding secret information within ordinary text so that only the intended recipient knows a hidden message exists.
How does zero-width steganography work?
It uses invisible Unicode characters (zero-width space, zero-width non-joiner) to encode binary data within normal text. These characters are invisible but preserved when text is copied.
Can the hidden message be detected?
Yes, by someone who knows to look for zero-width characters. This is not encryption - it is concealment. For security, encrypt your message before hiding it.
Does it work with all text formats?
It works with any system that preserves Unicode characters, including most messaging apps, emails, and text editors. Some platforms may strip zero-width characters.