UD5 Toolkit
Invisible Text Generator - Online Zero‑Width Secret Messages
Encode a hidden message using zero‑width characters. The message looks like normal text. Decode with the same tool.
Steganography Text Hider - Online Conceal Secret Message
Steganography Text Hider
Hide secret messages inside ordinary text using invisible zero‑width characters. No one will notice – until you reveal it.
This is the ordinary text that everyone will see.
The hidden message will be invisible after embedding.
This text looks identical to your cover text but carries the secret. Use it anywhere.
The tool will scan for zero‑width characters and recover the secret.
Frequently Asked Questions
Text steganography is the art of hiding a message within another ordinary-looking text. Unlike encryption, which makes a message unreadable, steganography conceals the very existence of the message. Our tool uses invisible zero‑width Unicode characters to embed secret data.
It converts your secret message into UTF‑8 bytes, then represents each bit of every byte with a zero‑width character: U+200D (ZWJ) for 1 and U+200C (ZWNJ) for 0. Byte boundaries are marked with U+200B (ZWSP). This invisible stream is appended to your cover text. The visible part remains unchanged, but a computer can read the hidden payload.
No, this tool provides concealment, not encryption. Anyone who knows you used zero‑width steganography can extract the message. For sensitive data, we recommend encrypting the message before hiding it. That way you get both secrecy and stealth.
Zero‑width characters are invisible to the naked eye, but they can be spotted by specialized scanners, word‑processor “show hidden characters” modes, or platforms that strip them. Many social networks and messaging apps preserve them, making the technique practical for casual use.
Common uses include: adding hidden watermarks, sending covert messages in emails or forum posts, embedding metadata in code comments, or simply playing with privacy tools. Remember to test the channel first—copy‑paste your stego‑text and try to extract it again to ensure the platform doesn’t strip the invisible characters.
- Each hidden byte adds 9 invisible characters – large messages need a long cover text (or you can repeat the cover text).
- Some platforms (like certain sanitizers) remove zero‑width characters entirely.
- If someone converts the text to a format that discards invisible characters (e.g., plain‑text OCR), the message is lost.
- It is not a substitute for encryption when strong security is required.
Not universally. Most modern websites, messaging apps (WhatsApp, Telegram, etc.), and email clients preserve zero‑width characters. However, some older systems, plain‑text editors, and aggressive content filters may strip them. Always verify before relying on it.
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