Encode messages using various methods including zero-width characters, invisible ink Unicode, and whitespace encoding.
This tool hides a message by converting it into characters that occupy space but display nothing: zero-width Unicode code points, invisible-ink characters, or whitespace runs arranged in patterns. You pick a method, enter your secret and a visible carrier text, and the output reads as the carrier alone. The thing most people get wrong the first time: this is encoding, not encryption. Anyone who knows the method, or recognizes the tell-tale invisible-character patterns, can decode the message back to plain text. Treat it as hiding a note, not locking a safe.
These methods convert the secret into bits and map each bit to a choice between code points that render nothing, such as U+200B and U+200C, with a terminator at the end. The invisible sequence is stitched into a visible carrier message, so the text looks unchanged. Decoding ignores every visible character, re-reads the invisible ones as bits, and rebuilds the message. Encoder and decoder must share the same mapping.
Whitespace encoding keeps the message in ordinary-looking whitespace: tabs and spaces after line endings, or trailing spaces at line ends. A common scheme maps one bit per character, with space meaning 0 and tab meaning 1, so a short paragraph can carry a small message. Anything that normalizes whitespace, such as an HTML renderer collapsing spaces, a code formatter, or an editor trimming trailing spaces, deletes the hidden message too.
No. This tool encodes, it does not encrypt. The character-to-bit mapping is fixed, so anyone who guesses the method can decode the message in seconds, and the invisible characters themselves advertise that something is hidden. If the content truly matters, encrypt it with a strong password-based cipher first and encode only the ciphertext; the key, not the method, is what protects it.
The channel almost certainly stripped the invisible characters. Many chat apps, social platforms, and content management systems filter zero-width characters or normalize whitespace before storing text, and none of them tell you. Paste into the exact channel you plan to use and decode from it to confirm, and make sure both ends selected the same method, since outputs of different methods are not interchangeable.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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